bob wrote - If you haven't replaced the fuel filter lately do it now and let us know what happens.
---------> fuel pump and filter both replaced about six months ago.
before fuel pump and filter were replaced - the engine did have one episode similar to what i'm describing about 9 months after about 2 hours of interstate driving, but i was close to home when it was acting up and was going to work on it later that day but problem went away, so didn't give much thought. now, it seems to be back and a lot more frequently, and with a new pump and filter in place.
=3D=3D=3D=3D=3D=3D=3D=3D From: snipped-for-privacy@yaywho.com (Backyard=A0Mechanic) PALMER snipped-for-privacy@webtv.net (c palmer) wrote: =A0=A0=A0=A0at first, one will think it is the fuel system, but this has been ruled out already.
IOW, you are saying you KNOW you have proper fuel pressure AT THE TIME the Engine is running badly. Hate to be a poopy-head.... but you DONT call a consultant into your business to solve a problem and tell him the obvious has been ruled out without reviewing it.
-------> don't worry about being a poopy -head, i'll take any ideas and leads. :))
you are right, i didn't have a fuel gauge with me at the time it was acting up. but, what puts a spin on this problem is that i have been able to put it in neutral, kill the engine and coast almost a mile on a down grade. (thinking that the passing air would cool down the part or module) when the speed drops down to where traffic is passing me, i can start the engine and it runs great. have even taken on the next steep hill under full throttle delivery figuring that if it is a fuel delivery problem, holding the engine's feet to the fire for a longer duration than what one takes to pass, should show up something - if it was fuel related, but the engine hung in there and kept delivering the power with no miss or stubble.
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From: snipped-for-privacy@yahoo.com (gerald2003r)
Is vapor lock unheard of in fuel injected engines?
------->i, personally, haven't heard of a fuel injected engine vapor locking. =3D=3D=3D=3D=3D=3D=3D
If it were me I would go for the coil pack, BUT before I did that I would disconnect the battery for 10 minutes or so to lose anything stored in the computer. Maybe look at the coil pack electrical feed connections? I don't know the design of the coil pack enough and it would be interesting if someone here could speak about it to say if the
1993 series coil packs are one as a unit of if they will fail separately per cylinder? When it comes to engine management I think computer... Disconect that Battery and see what happens first... The computer is also going to tell the injectors when to fire. I understand the heat failure idea but I'm thinking the computer forgot what to do idea is also plausible. Worth a shot...
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-------> the coil pack design are four to a side - up front. they don't get the heat as they would if they were installed on the back side of the engine or in the case of the 1998 and up with the coil over plug design, where heat is a common problem in killing the module.
the check engine light does comes on, but it is a soft core error, and the computer resets itself, when the key is turned off.
i haven't been able to get to anywhere to pull the codes when the check engine light comes on. just seems that i'm at the wrong place at that particular time. along with the can of "quick kool", i should bring my x-ray hook up unit too.
--------- From: snipped-for-privacy@remove.comcast.net (Tom=A0Adkins)
=A0=A0=A0=A0With the extra info, Yep, that's a head scratcher. That hour of good performance throws me. There's 2 things that come to mind for your symptoms, but they don't seem the fit the conditions that you describe exactly. First, pull the plug wires and apply a liberal amount of dielectric grease to the boots then drive it to see if there is any change. Then, clean the element on the MAF sensor with a non residual solvent, see if that changes anything. Obviously check the fuel pressure when the symptoms occur, but I wouldn't expect to see a large drop in fuel economy if the engine is not getting enough fuel to start with. =A0=A0=A0=A0I recall hearing something about flaky Crank Position Sensor connections being common on these motors but I don't remember the details.
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--------> anything is possible when it comes to mechanics, that's for sure. but the plug wires are fairly new. i just pulled them after i read your post and the boots are still good and soft, with no evidence of carbon tracking.
the reason i replaced them was because it did have a repeated misfiring (common for plugs and wires) and it did fix the problem right away and it was permanent.
with the MAF sensor, i don't think would keep resetting itself. by that, i'm referring to where the engine, goes right back up to the 23 -
25 mpg range after the problem resolves itself. that is, until, the symptoms show it and then, the computer's overall mileage - after reset
- will show 12 - 13 mpg while the engine is acting up.
i'm not aware of how the flaky crankshaft sensors are suppose to behave when they are going out. unless my thinking is off, i'm thinking that when the engine doesn't get the crankshaft sensor input, it just doesn't fire. this engine fires, but sputters-like and i have to keep in mind that it still idles great when these symptoms are going on, just can't call for power from the engine when it is in this state. another head scratcher.
--------------- maybe, i'm just getting too old for this stuff and they can just hook it up to another computer and let the two computers talk to each other. i know in time, the part will fail and then it's easy to find, but i don't want to be miles from home. wife has had two heart attacks, plus two partly stopped up stents and i've got two different cancers chewing on me and bum knees. so neither one of us don't need be walking on the interstate, especially, if you know that something is not quite right under the hood. i use the car a lot to go the VA hospital in the next state over for treatments and follow up visits. that might explain why a lot of interstate driving.
~ curtis
knowledge is power - growing old is mandatory - growing wise is optional = "Many more men die with prostate cancer than of it. Growing old is invariably fatal. Prostate cancer is only sometimes so."
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