Fuel pressure issue - 95 Astro - please help

Can someone please help me figure this out? I am really stuck.
I have a 1995 CHEVROLET TRUCK ASTRO VAN 2WD 6 Cylinders 262 W 4.3L CPI. 105,000 miles

Symptoms: The van is cutting out like it is running out of fuel while driving.
I let the van warm up first before a test drive. It drives okay (not great) at first, then it starts acting like it is running out of gas. It bogs down and stalls when I accelerate. I tried flooring it and it wants to die. This problem is progressive meaning it is getting worse; now it happens after just a couple miles of driving. The problem will go away (van drives much better) after turning off the van and then back on.
History: Fuel pump quit working over new years. I replaced and it drove fine. I drove one 300 mile trip then another 300 miles of city driving with no problems.
It got real cold (irrelevant?). I drove for 25 miles with no issues. I filled up with gas (irrelevant?) after work and drove 10 miles and it started acting up.
The problem got worse over the next couple days (60 miles city driving).
I changed the fuel filter which was clogged and appeared to be the original filter. It seemed to run fine. I drove several very short trips 5 miles which may have been too short to notice symptoms. I filled up again, then drove 15 miles.
It acted worse than ever.
I checked the fuel pressure. It was about 62psi with the pump running but dropped to 6psi when not running.
I replaced the CPI unit and the nut kit (fuel lines). The fuel regulator was leaking. I could see where the gas had cleaned the inside of the plenum.
I retested fuel pressure. It was 62psi with the pump running but dropped to 22psi with the pump off. My Haynes manual said it should only drop 3-10psi with the key off.
I road tested the van and it has the same symptoms.
Shouldn't I be able to see or smell the gas that bleeds off? I don't see any gas (I will double check tonight).
Now I do not know what to do. I am stuck. Can anyone offer any suggestion?
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There is a "sock" type filter for the big chunks at the fuel pickup in the tank. If these plug / clog or collapse they can cause similar problems.
Good luck, Don

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Sounds like a plugged gas filter. It is on the inside of the chassis on driver side just in front of wheel well.It is a canister about 2 inches in diameter and about three inches long . Careful when removing hoses as they are under pressure and wear safety glasses .

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Sounds like a plugged fuel filter. You can find it on the chassis on driver side just in front of the wheel.....

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A clogged catlytic converter can cause similar symptoms. Given that you likely have a vortec vin "W" 4.3, I would think this would be more likely. 4.3 vin "W" uses an oddball fuel injection prone to leaks that would make a clogged converter more likely. A converter simplified is either filled with platinum pellets or has a honeycomb of platinum (no flames, guys remebmber I said simplified) for the exhaust to flow through. This material catalyzes excess hydrocarbons (unburned gas) into H2O CO2 and H2SO4 along with a few other minor trace byproducts. BTW H2SO4 us what causes that rotten "egg smell" you sometimes get. When a rich condition (as results from a leaking injector) the pellets (worst) or honeycomb (better) overheats and can even melt. Pellets melt into a solid slug in the that can almost completely block the converter making your car very constipated. The symptoms are that it starts and idles fine, might even run ok when you drive very softly, but when you put your foot in it it feels like you shut the motor off. Happened to me once in a 91 Celebrity, and was really strange. Like I said it would start and idle fine, when I put it in gear, it would accellerate ok if I feathered the throttle. If I kept on like that, I could get up to highway speeds, but the minute I tried to accellerate any faster, it would fall on it's face. Picture this, 35 mph 4th gear steady, step on the gas, it downshifts to 2nd at 4000 rpm an slows down rather than speeds up. KenG Dog wrote:

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Thanks for the suggestion. That sounds like it is very likely what is wrong.
I did have a leaky fuel injector that I just replaced. I will get the converter check/changed saturday if necessary.
Thanks
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Make sure you have it checked out before you replace it. A good muffler shop has a guage they can install in place of an O2 Sensor that indicates exhaust backpressure. Please let us know what the final fix is. We all can make suggestions here, but having feedback to let us know if we actually helped (or not) is what we always look forward to. KenG
snipped-for-privacy@gmail.com wrote:

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In article
snipped-for-privacy@gmail.com wrote:

You need to determine if this thing is going too rich or too lean when it acts up. Ideally, a test drive with a scan tool installed so you can view O2 sensor volts and the fuel trim numbers. Plug color and watching the O2 sensor on a DVOM is a do-able method if you don't have a scan tool.
The fuel pressure shouldn't drop off as it does, weak pumps and/or a failed pulsator usually manifest themselves as hard starting after an overnight set. Entirely possible that it's the CPI and regulator (again), who did you get those components from?
Did you re-use the old pulsator when you changed out the pump? Pulsator = the oval shaped piece that connects the fuel pump outlet to the sending unit , black plastic with a stamped tin cover.
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I do not think I replaced the pulsator, unless it came with my autozone pump. The CPI and nut kit where ACDelco parts.
I kind of think it might be the catlytic converter now. That is what a couple people have told me and it seems like these symptoms could be caused by a clogged converter. I will test it first since it is a bit easier. Then I guess I will either do the test drive you suggested and change the pulsator.
Thanks for the suggestions,
Dave
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On 3 Feb 2005 20:38:50 -0800, snipped-for-privacy@gmail.com wrote:

If you would get a data logger, do they have them for a 1995 car/van ? ///////////////////////////////////////////////////////////////////////////////////////////////////////////
My fuel pressure is _supposed to be between 35 and 45 psi according to the book, but I see on SOME occasions it goes outside those bounds, especially while idling. In fact, it seems only while idling. So I don't know what that is all about. NO DTC CODES either thrown or pending, according to my OBDII scanner. But my data logger picked this up. Notice what happens at the 13 minute point when I was idling the car while eating lunch one day....
Fuel pressure doesn't come back to normal until minute 25, when I accelerate and travel off again.
For 11 minutes my system was over pressurized, but no MIL or DTC codes. And out of 115 trips on this particular log, it only happened this _once_.
Anyhow, if you can fit a data logger on a 95 Astrovan ( haven't a clue if you have an OBDII port ) you can use a data logging chip to watch your fuel system while you drive around.
//////////////////////////////////////////////////////////////////////////////////////////////////////////// CAUTION: BANDWIDTH BUSTER AHEAD: ////////////////////////////////////////////////////////////////////////////////////////////////////////////
NOTE: the three digits on the right, two to the left of the decimal point and one to the right, show fuel pressure at 5 second intervals from start of engine.
Time into trip is left of that
If you do this, you have narrowed down one possibility. And you can log fuel trims right along with that.
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
Title : View / Trip Log / Trip 22 / Plot / Fuel Pressure (psi) / Start Time Rows : 1 Columns : 1 Column 01 : Start Time [] 1/21/2005 1:56 PM
Title : View / Trip Log / Trip 22 / Plot / Fuel Pressure (psi) Rows : 606 Columns : 2 Column 01 : Elapsed Time [] Column 02 : Fuel Pressure (psi) [psi] 0:00:00    48.7 0:00:04    47.4 0:00:09    46.6 0:00:14    46.1 0:00:19    46.6 0:00:24    44.4 0:00:29    44.8 0:00:34    43.1 0:00:39    45.7 0:00:44    40.5 0:00:49    44.8 0:00:54    39.6 0:00:59    41.8 0:01:04    39.2 0:01:09    41.3 0:01:14    40.5 0:01:19    38.3 0:01:24    38.7 0:01:29    40.5 0:01:34    41.3 0:01:39    39.2 0:01:44    38.7 0:01:49    41.8 0:01:54    40.0 0:01:59    37.9 0:02:04    40.0 0:02:09    39.2 0:02:14    40.5 0:02:19    41.3 0:02:24    38.3 0:02:29    39.2 0:02:34    40.5 0:02:39    39.2 0:02:44    40.5 0:02:49    39.6 0:02:54    40.5 0:02:59    40.5 0:03:04    38.7 0:03:09    40.0 0:03:14    38.7 0:03:19    39.2 0:03:24    39.6 0:03:29    39.2 0:03:34    37.9 0:03:39    39.6 0:03:44    38.7 0:03:49    38.7 0:03:54    39.2 0:03:59    39.2 0:04:04    38.7 0:04:09    39.6 0:04:14    40.9 0:04:19    38.7 0:04:24    38.3 0:04:29    40.0 0:04:34    40.5 0:04:39    40.0 0:04:44    39.2 0:04:49    39.6 0:04:54    40.0 0:04:59    38.7 0:05:04    40.5 0:05:09    38.7 0:05:14    40.5 0:05:19    40.0 0:05:24    38.7 0:05:29    40.5 0:05:34    39.2 0:05:39    38.7 0:05:44    38.7 0:05:49    39.6 0:05:54    41.3 0:05:59    38.7 0:06:03    38.7 0:06:08    41.3 0:06:13    37.9 0:06:18    39.6 0:06:23    38.7 0:06:28    38.7 0:06:33    38.7 0:06:38    40.0 0:06:43    39.6 0:06:48    38.3 0:06:53    40.5 0:06:58    40.5 0:07:03    39.6 0:07:08    39.6 0:07:13    40.9 0:07:18    38.7 0:07:23    38.7 0:07:28    39.2 0:07:33    39.6 0:07:38    39.6 0:07:43    37.9 0:07:48    41.3 0:07:53    41.3 0:07:58    40.0 0:08:03    41.8 0:08:08    40.9 0:08:13    38.3 0:08:18    40.5 0:08:23    38.7 0:08:28    39.6 0:08:33    38.7 0:08:38    40.5 0:08:43    40.0 0:08:48    39.2 0:08:53    39.6 0:08:58    40.9 0:09:03    39.6 0:09:08    39.6 0:09:13    40.0 0:09:18    39.6 0:09:23    41.8 0:09:28    41.3 0:09:33    41.3 0:09:38    40.5 0:09:43    42.2 0:09:48    41.3 0:09:53    42.6 0:09:58    42.6 0:10:03    44.4 0:10:08    41.3 0:10:13    42.6 0:10:18    40.9 0:10:23    44.4 0:10:28    41.3 0:10:33    43.9 0:10:38    43.1 0:10:43    44.8 0:10:48    43.9 0:10:53    44.4 0:10:58    42.2 0:11:03    41.8 0:11:08    44.8 0:11:13    44.4 0:11:18    44.8 0:11:23    46.1 0:11:28    45.3 0:11:33    43.9 0:11:38    46.1 0:11:43    42.2 0:11:48    43.1 0:11:53    46.1 0:11:58    43.9 0:12:03    45.3 0:12:07    47.0 0:12:12    44.8 0:12:17    47.9 0:12:22    45.3 0:12:27    45.7 0:12:32    46.6 0:12:37    45.3 0:12:42    45.7 0:12:47    46.6 0:12:52    46.1 0:12:57    45.3 0:13:02    46.6 0:13:07    46.1 0:13:12    46.6 0:13:17    48.3 0:13:22    47.4 0:13:27    49.2 0:13:32    46.6 0:13:37    45.3 0:13:42    48.7 0:13:47    47.9 0:13:52    48.3 0:13:57    49.6 0:14:02    49.2 0:14:07    46.6 0:14:12    47.4 0:14:17    48.3 0:14:22    47.4 0:14:27    47.4 0:14:32    49.2 0:14:37    50.5 0:14:42    49.6 0:14:47    49.2 0:14:52    48.7 0:14:57    48.7 0:15:02    50.9 0:15:07    48.3 0:15:12    51.3 0:15:17    49.6 0:15:22    48.3 0:15:27    49.2 0:15:32    53.5 0:15:37    50.5 0:15:42    51.3 0:15:47    50.0 0:15:52    50.9 0:15:57    50.9 0:16:02    50.0 0:16:07    50.5 0:16:12    53.1 0:16:17    52.6 0:16:22    49.2 0:16:27    49.6 0:16:32    51.3 0:16:37    51.3 0:16:42    51.8 0:16:47    50.5 0:16:52    51.8 0:16:57    53.1 0:17:02    52.6 0:17:07    51.8 0:17:12    52.2 0:17:17    53.1 0:17:22    51.3 0:17:27    50.9 0:17:32    51.8 0:17:37    51.8 0:17:42    52.2 0:17:47    51.3 0:17:52    53.5 0:17:57    52.6 0:18:02    52.2 0:18:06    51.3 0:18:11    50.9 0:18:16    50.0 0:18:21    51.8 0:18:26    51.8 0:18:31    53.1 0:18:36    52.2 0:18:41    52.6 0:18:46    54.0 0:18:51    53.5 0:18:56    54.0 0:19:01    51.3 0:19:06    52.6 0:19:11    52.6 0:19:16    54.8 0:19:21    51.8 0:19:26    55.3 0:19:31    53.1 0:19:36    53.5 0:19:41    52.2 0:19:46    52.6 0:19:51    53.5 0:19:56    53.1 0:20:01    55.3 0:20:06    51.3 0:20:11    55.3 0:20:16    52.6 0:20:21    54.0 0:20:26    54.4 0:20:31    58.3 0:20:36    55.3 0:20:41    54.0 0:20:46    53.5 0:20:51    54.8 0:20:56    53.5 0:21:01    55.3 0:21:06    54.0 0:21:11    54.0 0:21:16    53.1 0:21:21    54.0 0:21:26    54.4 0:21:31    53.5 0:21:36    52.2 0:21:41    54.4 0:21:46    54.4 0:21:51    54.4 0:21:56    54.4 0:22:01    55.3 0:22:06    53.1 0:22:11    54.8 0:22:16    55.7 0:22:21    54.8 0:22:26    50.9 0:22:31    54.4 0:22:36    54.0 0:22:41    54.0 0:22:46    52.2 0:22:51    54.8 0:22:56    54.8 0:23:01    54.4 0:23:06    56.1 0:23:11    56.1 0:23:16    52.6 0:23:21    55.7 0:23:26    53.1 0:23:31    54.4 0:23:36    55.7 0:23:41    55.7 0:23:46    56.1 0:23:51    54.0 0:23:56    54.4 0:24:01    54.0 0:24:06    53.5 0:24:10    53.5 0:24:15    50.9 0:24:20    51.8 0:24:25    51.8 0:24:30    55.7 0:24:35    50.5 0:24:40    51.3 0:24:45    51.8 0:24:50    50.9 0:24:55    47.0 0:25:00    46.6 0:25:05    44.8 0:25:10    50.5 0:25:15    46.1 0:25:20    46.6 0:25:25    45.3 0:25:30    42.6 0:25:35    44.8 0:25:40    45.7 0:25:45    47.0 0:25:50    46.6 0:25:55    45.7 0:26:00    44.4 0:26:05    44.4 0:26:10    47.9 0:26:15    44.4 0:26:20    47.0 0:26:25    43.9 0:26:30    43.1 0:26:35    41.8 0:26:40    44.4 0:26:45    42.2 0:26:50    45.3 0:26:55    41.3 0:27:00    43.5 0:27:05    37.0 0:27:10    43.1 0:27:15    39.2 0:27:20    38.3 0:27:25    39.6 0:27:30    40.0 0:27:35    38.3 0:27:40    40.9 0:27:45    40.5 0:27:50    38.7 0:27:55    40.0 0:28:00    40.9 0:28:05    41.3 0:28:10    39.2 0:28:15    40.9 0:28:20    38.3 0:28:25    40.0 0:28:30    40.0 0:28:35    40.5 0:28:40    39.6 0:28:45    40.0 0:28:50    40.9 0:28:55    37.9 0:29:00    38.7 0:29:05    40.0 0:29:10    39.6 0:29:15    40.0 0:29:20    39.6 0:29:25    40.0 0:29:30    40.0 0:29:35    40.5 0:29:40    40.0 0:29:45    39.2 0:29:50    42.2 0:29:55    39.6 0:30:00    38.3 0:30:05    39.2 0:30:09    40.5 0:30:14    38.3 0:30:19    40.5 0:30:24    39.2 0:30:29    40.0 0:30:34    40.5 0:30:39    42.2 0:30:44    40.5 0:30:49    40.0 0:30:54    40.5 0:30:59    39.6 0:31:04    39.2 0:31:09    42.2 0:31:14    40.5 0:31:19    40.5 0:31:24    38.7 0:31:29    40.0 0:31:34    38.7 0:31:39    40.0 0:31:44    38.7 0:31:49    37.9 0:31:54    40.0 0:31:59    40.5 0:32:04    38.7 0:32:09    40.9 0:32:14    39.2 0:32:19    39.6 0:32:24    38.7 0:32:29    41.3 0:32:34    39.6 0:32:39    40.0 0:32:44    39.2 0:32:49    38.3 0:32:54    37.9 0:32:59    40.9 0:33:04    39.6 0:33:09    38.7 0:33:14    41.3 0:33:19    40.5 0:33:24    39.6 0:33:29    38.3 0:33:34    40.0 0:33:39    37.9 0:33:44    41.8 0:33:49    38.7 0:33:54    39.2 0:33:59    40.0 0:34:04    39.6 0:34:09    38.3 0:34:14    41.3 0:34:19    39.2 0:34:24    39.2 0:34:29    41.3 0:34:34    38.3 0:34:39    39.6 0:34:44    39.6 0:34:49    40.5 0:34:54    40.0 0:34:59    40.9 0:35:04    40.0 0:35:09    40.9 0:35:14    40.9 0:35:19    39.6 0:35:24    39.2 0:35:29    38.3 0:35:34    38.7 0:35:39    40.0 0:35:44    38.3 0:35:49    38.7 0:35:54    38.7 0:35:59    40.5 0:36:04    40.5 0:36:09    41.3 0:36:13    40.9 0:36:18    38.7 0:36:23    40.5 0:36:28    39.6 0:36:33    40.5 0:36:38    41.3 0:36:43    39.6 0:36:48    39.6 0:36:53    38.7 0:36:58    39.6 0:37:03    38.3 0:37:08    39.6 0:37:13    37.9 0:37:18    39.6 0:37:23    39.6 0:37:28    40.0 0:37:33    39.2 0:37:38    40.9 0:37:43    38.7 0:37:48    38.7 0:37:53    39.6 0:37:58    40.5 0:38:03    40.5 0:38:08    38.3 0:38:13    40.0 0:38:18    38.3 0:38:23    39.2 0:38:28    40.9 0:38:33    39.2 0:38:38    41.3 0:38:43    40.0 0:38:48    39.6 0:38:53    39.2 0:38:58    37.9 0:39:03    39.2 0:39:08    40.9 0:39:13    38.7 0:39:18    40.9 0:39:23    39.2 0:39:28    40.5 0:39:33    38.3 0:39:38    39.6 0:39:43    40.5 0:39:48    40.9 0:39:53    40.0 0:39:58    38.3 0:40:03    37.4 0:40:08    40.0 0:40:13    40.5 0:40:18    40.0 0:40:23    39.6 0:40:28    43.5 0:40:33    40.9 0:40:38    40.9 0:40:43    40.9 0:40:48    39.6 0:40:53    39.2 0:40:58    39.2 0:41:03    39.6 0:41:08    38.3 0:41:13    40.0 0:41:18    38.7 0:41:23    39.6 0:41:28    38.7 0:41:33    40.5 0:41:38    39.6 0:41:43    40.0 0:41:48    40.5 0:41:53    39.6 0:41:58    39.2 0:42:03    40.0 0:42:08    41.3 0:42:12    41.3 0:42:17    38.7 0:42:22    39.6 0:42:27    39.6 0:42:32    41.3 0:42:37    38.3 0:42:42    38.7 0:42:47    40.0 0:42:52    39.6 0:42:57    40.9 0:43:02    39.2 0:43:07    38.7 0:43:12    39.2 0:43:17    38.7 0:43:22    38.7 0:43:27    40.9 0:43:32    40.0 0:43:37    35.7 0:43:42    40.5 0:43:47    38.3 0:43:52    40.0 0:43:57    40.9 0:44:02    39.2 0:44:07    39.2 0:44:12    39.2 0:44:17    40.9 0:44:22    39.6 0:44:27    40.5 0:44:32    39.2 0:44:37    40.9 0:44:42    40.5 0:44:47    38.7 0:44:52    38.7 0:44:57    38.7 0:45:02    39.2 0:45:07    40.0 0:45:12    41.3 0:45:17    40.5 0:45:22    39.2 0:45:27    40.0 0:45:32    38.7 0:45:37    41.3 0:45:42    39.2 0:45:47    40.5 0:45:52    40.0 0:45:57    41.3 0:46:02    40.9 0:46:07    41.3 0:46:12    38.7 0:46:17    40.0 0:46:22    41.3 0:46:27    39.6 0:46:32    39.6 0:46:37    37.9 0:46:42    40.0 0:46:47    40.0 0:46:52    39.2 0:46:57    39.2 0:47:02    39.6 0:47:07    38.7 0:47:12    40.0 0:47:17    39.2 0:47:22    39.2 0:47:27    40.0 0:47:32    40.0 0:47:37    40.9 0:47:42    38.3 0:47:47    41.3 0:47:52    37.9 0:47:57    38.7 0:48:02    41.8 0:48:07    38.7 0:48:12    39.2 0:48:16    41.3 0:48:21    38.7 0:48:26    39.6 0:48:31    40.5 0:48:36    40.5 0:48:41    39.2 0:48:46    38.7 0:48:51    39.6 0:48:56    40.5 0:49:01    39.2 0:49:06    39.2 0:49:11    39.6 0:49:16    40.9 0:49:21    41.8 0:49:26    40.5 0:49:31    41.3 0:49:36    41.8 0:49:41    39.6 0:49:46    38.7 0:49:51    37.9 0:49:56    39.2 0:50:01    40.9 0:50:06    38.7 0:50:11    41.3 0:50:16    38.7
Title : View / Trip Log / Trip 22 / Plot / Fuel Pressure (psi) / End Time Rows : 1 Columns : 1 Column 01 : End Time [] 1/21/2005 2:20 PM
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Bad tank of gas with lot's of water/crud. It keeps plugging things up.

it
Notice how it started right after you filled up? Pump out the tank. Fill with known good fuel. Replace the fuel filter again. Brt the problem goes away.
--
Steve Williams
Near Cooperstown, New York
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I think that is what I will try now. I just replaced my exaust/convert from the O2 sensor back and it did not help.
This is getting expensive :(
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I think that is what I will try now. I just replaced my exaust/convert from the O2 sensor back and it did not help.
This is getting expensive :(
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On 5 Feb 2005 12:18:43 -0800, snipped-for-privacy@gmail.com wrote:

The only way I know of monitoring your fuel pressure "while you are driving around" is to have somebody plugged into your OBDII connector with a real-time scanner, OR, use a data logger ( e.g. Davis DriveRight CarChip, or record on a portable PC with a program like AutoTap ).
I find that static one-shot readings don't really tell the whole story of what is going on, that is why I keep a data logger plugged into the OBDII port all the time. At 5 second test sweeps, it monitors up to 25 continuous hours of running time. At 60 second intervals, 300 continuous hours of running time. I keep it at the 5 seconds sampling frequency and can watch what is really going on during all kinds of driving conditions.
I might pull it out ever 2 or 3 weeks and look at the graphs. If everything looks OK, I clear the chip memory and plug it back in. Even once a month would be OK, as I've never used more than 22% of the memory although I take a _lot_ of short trips.
You can then discard the data, or save it to a file for future reference. I call it my "flight recorder."
Lg
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wrote:

Nice guess Larry but since his PCM has absolutely no clue what the fuel pressure is, your data logger won't work. It may be able to moniter several things but fuel pressure isn't among them. Bob

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wrote:

several
not directly, but here's a thought:
I get a LOT of GM trucks with a 'no 4th gear' complaint
if you drive it just right, it WILL go into 4th............but the problem is plugged fuel filter, thus more throttle pressure, thus ECM keeps it in third
SO:
do what I do to demonstrate to the customer where the problem is...............monitor O2 sensors + injector pulse width
if you see O2 going lean and at the same time the IPW is getting longer and longer, you have a fuel delivery problem.............filter or pump
just a thought
G
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wrote:

That's true enough Gary, but it still doesn't change the fact that Glickman is full of shit.... yet again.... The PCM doesn't have a clue what the fuel pressure is. It may think the engine is lean due to the feedback it gets from the O2 sensors and increase the fuel trim to compensate. But it still doesn't know if the problem is fuel pressure, a bad sensor, or something else. It just knows it is having to add fuel to get an O2 response and will set a code if it reaches a certain limit. Bob
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wrote:

exaust/convert
problem
in
Glickman
fuel
oh, I know
I just thought it might help somebody else.........some one who's not suffering from 'cranio-rectitis'

will
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I just test drove the van with the fuel gauge hooked up and the needle swept between 50psi and 70psi when I accelerated. The pressure never dropped below 50psi even while the van was running poorly.
I also drained the gas and re-changed the fuel filter and it did not help.
I will try and better explain how it is acting.
The van always starts and runs fine. It drives fine for a short distance then starts to run very bad, sometimes backfires, stalls, and completely dies.
It takes as much as 10 to 15 minutes of regular city driving to cause these symptoms or 2-3 minutes of driving under a load (when I hot rod it).
If the van completely dies, I can turn it off for 10 seconds then right back on and I can usually baby it home (1-2 miles). If I leave it off for 15 minutes it usually runs quite a bit better.
I have replaced: Leaky CPI (spider) Inlet outlet fuel lines (nut kit) Fuel Filter Fuel Pump and strainer Exhaust from O2 sensor back (waste of $$$... my dumb fault) Drained the gas
Is it time to take it to a mechanic? I am out of ideas and do not know what else to check. Is there a certain test that a shop could perform that would tell me what is wrong such as a general diagnostic or run it on a computer?
Does this still sound like a fuel delivery problem?
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Well you eliminated fuel problems. You say it only happens when the engine gets warm? Go to a local electronics place and get a can of "component cooler" (basically R-134A) Run the vehicle till it starts to act up. Then pop the hood and spray ONE sensor/part at a time. I would start with the ignition coil, then the base of the distributor. Then work your way around the engine compartment. After you spray a part run it some, when you find the bad part it should become obvious since the problem should go away. I would almost guess the coil is breaking down when it gets hot, but there are a LOT of sensors that can be affected by heat.
--
Steve
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