fenster44

My 95 G20 is having some annoying bogging/hesitation problems. The hesitation occurs mostly between 1000 and 3000 RPM. Basically, the car feels flat if I give it more than half throttle. The car has just over 90k miles.


I've checked the usual suspects and haven't found a solution yet. In the last 200 miles, I've done the following:
O2 sensor
plugs
wires
dist cap and rotor
fuel filter
battery
alternator
knock sensor (I was getting the P0325 code)
EGR and BPT (cleaned)
Throttle body (cleaned)
reset base idle

I checked base timing and it was fine. TPS voltage and resistance checked out ok. MAF looks clean... voltage was a tiny bit high. I guess I should try re-grounding it, but I'm not very optimistic. The last time I pulled my spark plugs, the ground electrodes were slightly white. The car seems pretty smooth above 3000rpm all the way to redline, although it seems less peppy than it used to. It feels really weak in the lower revs.

What else should I look at? I'm starting to get pretty frustrated... especially after the knock sensor replacement didn't solve my problems (I hope I never have to do that job again).

Thanks!

MegaSoreAss

I have a similar problem. I checked all values for the various sensors and found that the TPS sensor read correct voltages at closed and open throttle postions, but that the voltage climb was not linear. The voltage stalled at three or four points between open and closed throttle positions. This would make the ECU think that the engine was not accelerating at those "flat points".

I have ordered a new TPS. I don't know if it will solve the problem, but it certainly is a problem. The TPS has about 450,000 kilometers on it. I should have the new one in place by next week and I will let you know if it solved the problem.

fenster44

Interesting. I'll check my TPS again. I also want to retest my MAF.

Keep me posted on your progress.