Hi all. First of all, thank you to the participating experts in this group. You all really helped MadNeighbors with his stalling.
I have a problem that is very similar, but I want to avoid the expense he went through if at all possible :)
I run the car for a while and it works great, sometimes 20 minutes, sometimes 2 hours. I'll suddenly get a real bad hesitation on accelleration that lessens as I back off the gas or coast. It is about a 500 to 1000 RPM drop off, depending on how hard I press on the gas. The harder she comes, the harder she falls. This "drop off" oscillates about every second... on off on off etc...
It will stall at a light, running a little rough at 600 rpm (normal idle for this car is about 850 rpm) Pulling away is difficult, as the drop off in RPM's can stall the motor. If you apply steady gas, it will never actually quit, it will just ride like a hobby horse when accellerating.
This will continue until the car cools completly down, then it will be OK again, for an unpredictable amount of time.
The first thing I thought of was water in the gas. I ran it to just a gallon or so in the tank, poured in some ISO alchohol (Heet), and changed the fuel filter. I then added premium gas, and all was well for a few days, then it started again. Ran it down to empty again, added more alchohol, put more gas in.... still doing it.
I ran the Check Engine light and got codes for the MAF Sensor, Knock Sensor, and EGR Hi/Low flow.
Because the TPS is mentioned in the other post, I checked that first. Before the problem I had about 530 ohms, going up to over 4100 ohms in the open position. Durring the problem I had about 600 ohms at closed throttle and about 4200 at open throttle. This is a little high, the instructions say 500 ohms closed and 4000 open. I'm not sure if those readings I am getting are out of range or not.
I cannot find a link for testing proceedures for the MAF. The one I found said it had a five wire plug, and mine has only three wires (assuming I am looking at the right part:)
So, any usefull links, comments, or diagnosis would be greatly appreciated!
Thank you in advance Bill Roman snipped-for-privacy@ultravideo.com