We have recently purchased a 91 Camaro(117,000) AT 305 TBI. We replaced all filters(including fuel) and PCV. All guages are registering good.
Since day one we have expierenced the following problems:

A. High idle(1200-1400)
B. Occasionally when put in gear she stalls
C. Sluggish at times from a dead stop
D. When accerlated will hesitate, feel choppy or jerky at
times. Bottom line is power just feels robbed somewhere.

Just took her in to a qualified shop and had it hooked up to a diagnostic machine. They did the following:

1. Adjusted idle and timing to specs.
2. Checked vacume(ok)
3. Checked injectors(ok)
4. No codes came up

The car still has the problem in above B, C & D. Oddly enough I can start the car three times in a row and get slightly different RPM readings at idle.

Any suggestions as to what to look for or try next?

Thanks, Randy

 

Have you checked the feed line fuel pressure. Your pump could be heading south. I would also double check the timing. I have seen certified GM dealerships not unplug the EST while timing these cars.

By the way, welcome to the boards!

 

B, C, and D sounds like a problem I had. Do you know if the shop adjusted the TV/detent cable at all? If not, adjust it. I had the same problems that you did, including the high idle (I still haven't fixed that yet). If you don't know how to adjust the TV cable, just ask and I'll post how to.

And, like Shifty said, double check the timing and see if you can check the fuel pressure.

 

It might be more wise to just install an inline fuel pressure gauge to check where he's at, as opposed to dropping the $450 on a fuel pump change. . . but you kind of alluded to that, but he might not know about putting in a gauge.


Very true. There's an article in the "tech articles" section that explains which wire needs to be unplugged.

 

Good point Gunny and that was what I was tryin to get accros. You can install an inline gage that cotst about $30 for everything. it is a good thing to have so that you can monitor the behavior of your fuel system. You will have to get an electric gage with a sending unit and wire into the car if you want to see fuel pressures at wot. The gage in the line will tell you idle pressures while you look under the hood.