Rev causes engine to stumble... May 07, 2008, 10:08:33 PM I thought I had with me my spare TPS but cannot find it to verify that it is the culprit for this - when there is a sudden change in the amount of air coming into the motor, the engine wants to stall out - it died twice on Monday on the drive home from work while in stop & go traffic on the interstate - both times when giving it gas right after the transmission would decide to shift (so I kept it in 1st as long as I could and feathered the throttle). When the stumbling begins, fuel pressure shots up a couple points and vacuum drops to 5 inches. Unplugging the EGR doesn't change anything. I unplugged the TPS and noticed no change in how it acts so I'm assuming there is a problem right there.Does this sound like the next part to look at? It is still speed density so it makes sense. I tried testing a TPS a couple years ago and a multimeter on the wires didn't tell me anything useful so not sure if I did it wrong. Would checking this voltage at idle and WOT positions tell me if it's bad or is this not necessarily true? Quote Selected
Rev causes engine to stumble... Reply #1 – May 07, 2008, 10:10:21 PM Oh, and no codes with engine off, only smog pump codes (it seized up last week so pulled the pulley and ran a 4" shorter belt) with engine running. Quote Selected
Rev causes engine to stumble... Reply #2 – May 07, 2008, 11:19:05 PM The vac will fall as the engine revs start to fall, especially with any throttle opening... So I suspect this is just a result of your problem, certainly not the cause...So what's wrong??? With no codes, $hit I dunno... Quote Selected
Rev causes engine to stumble... Reply #3 – May 08, 2008, 04:01:58 PM The hose to the MAP sensor was kinked and got itself a small hole. Managed to get a (longer! Too much of a pain to install the intake with the old short hose) silicone hose over the intake fitting somewhat well (that thing is BIG compared to the fitting on the sensor) and everything is good again.TPS swept from 1-4.8v smoothly with opening the throttle body by hand. Quote Selected
Topic: Rev causes engine to stumble... (Read 795 times)
previous topic - next topic
