J30 Hesitation When warm

[jbcorwin]

Hey All,

1995 J30t 125,000 miles:

New Timg Belt (105,000) /Water Pump /Front Seal /Rear Main Seal / Valve Cover Gaskets / Radiator / recent fuel injection service / plugs (105,000)

I've always had some hesitation but barely noticable. I recently brought the car to the Nissan dealership for some work (valve cover gaskets, radiator, rear main seal, fuel injection service) after deciding I wanted to keep the car. I dropped 1800 for the rear seal, valve gaskets, radiator and fuel service. The car is running like crap when warm now. Any low speed acceleration (not mashing the pedal down) causes severe hesitation and actually anything between idle and about 1900 RPM I'm feeling the effects. Runs perfect when cold!

I called the tech he said if the check engine light is not on it could be one of a 100 things, not the answer I wanted after dropping close to 2000 on the car. Any opinions on what I should try on my own? I'll probably take it back this week but it's Sunday and I feel like poking around on my own.

I forgot to mention both PCV valves have been replaced as well. I don't want to easter egg with parts but maybe this problem will ring a bell with some of you?

Thanks a million.

Jeff

[fourdrinie]

check out the postings on the MAF...Mass Air Flow Sensor....might be something trying to tighten or clean the contacts..

[jbcorwin]

I had read that too but from my understanding that would cause problems at cold operating temps as well?? If that isn't right I'll give ita shot, what should I clean with?

Thanks!

[elwesso]

Not always will the MAF cause cold issues, on the Q45 it doesnt do that..

Id check that, maybe you have bad knock sensors... but id suspect the MAF first, clean it and then if that doesnt fix it, replace it. I bet you can use a Z32 MAF.