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Originally Posted by Drysdale
Hello, Thank you in advance for any help given. I've read many many posts but haven't yet seen the exact symptoms my Winnie is exhibiting. It's not acting the same as it has in the past when (multiple times) it needed the EGR ports cleaned or an injector replaced. It seems to start fine when it's cold and most times after it's warm (though on some warm restarts it sputters and runs rough before smoothing out and idling fine.) Starting and idling are no problem but giving it moderate acceleration makes it buck and jerk and surge. Doesn't matter if it's warm or cold. What's strange (to me) is that if you floor it (at any speed) it gets up and goes! No jerking, just power and speed. Since I don't want to drag race it from every stop I need to solve this but no success so far. In the past it's had O2 sensor codes and I never replaced any of them; it turned out to be something else. (EGR ports, vacuum line off, etc.) This time when it started this fit I had the code read and it was PO133, (upstream bank 1 slow response) same as at other times, so as usual I pulled off the upper intake to clean the EGR ports and they weren't clogged. Hmm. So I pulled off the fuel rail and injectors and cleaned the spray ends as I've done so many times before. Didn't help a bit. So, hey, why not, I went ahead and replaced that one O2 sensor and cleared the code. Still no good. Next, replaced the DPFR sensor, then the EVR solenoid, then the MAF sensor. Even though it didn't set any more codes I still removed the negative battery terminal to clear the Keep Alive Memory each time and then drove it for 20 miles to let it relearn the fuel trim. Still no good. Next replaced upper intake gasket set (I'm thinking possible vacuum leak, and I've never replaced that set before, even with the many times I've had that manifold off) and PCV. No good. This is where I am now. The van has 197K and I'm planning to keep it for another 100k Lord willing. Right now it shows no codes but is still jerking on take off. What else could cause this? Replacing any of the other sensors doesn't make $ense.
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This is a strange one. ??? My 95 runs rough on warm starts some times. I think it's the fuel injectors that need cleaning.
Have you checked your Throttel Position Sensor? TPS. Take a Multimeter and check the TPS. Make sure there is a consistant resistence the whole distance.
Regards
Dan