O2 sensor or MAP sensor?

Make sure your buddy measured the fuel pressure during WOT. It should be in the 58+ PSI range. At idle it is much lower, which is normal.

He just measured it at Idle and he was right in the middle of something so he didnt have time. So the measurement at idle is not a reliable reading? It would definately account for my loss of power and odd A/F mix. I suspected a vacuum leak but we tested for that and everything was fine. hmmmm

Hey Bob, thanks for the '97 file. My PCM happily took the file.

Like AA said, check your fuel pressure at WOT. If you havent done your fuel filter, then it may be time.

NP urbsnspices,
Hope you get yours dialed in with better luck than Im having so far.

I have to admit something... my rough idle, bad MPG, and poor performance really made itself evident last month when I ran out of gas.....there I admitted it. Felt like a damn fool.
Ive since done 2 techron treatments and changed the fuel filter, plugs and wires.
I'm just gonna go ahead and change the damn fuel pump. That way I can fix this annoying fuel gauge malfunction at the same time.

O2s bounce all over the place. It's the way an O2 sensor works. You are seeing voltage spikes with each exhaust pulse that passes by. You really can't read O2 sensors other than to know it's working.

i picked up a fuel pump from advance auto for about $200. just make sure you go to the dealer and get a new lock ring, i think that set me back about $25. if you dont then you will probably leak gas once you fill up to check for leaks.

40 PSI seems pretty good at idle. I would suspect a bad/dirty injector before I replaced the fuel pump.

I agree 40 psi should do ok. IIRC FSM says something like 48-52 is the expected without motor running and clicking the key to get the highest pressure possible.

Ok, Ill give it till the weekend and see if the last bottle of injector cleaner does any good. He did a test to see if the injectors were holding pressure and they were but I guess that doesnt tell me if theyre clogged.

My crappy laptop I was using for scanning took a dump so now I have to buy one of those too

thanks for all the advice

BoattailBob wrote:

NP urbsnspices,
Hope you get yours dialed in with better luck than Im having so far.

I have to admit something... my rough idle, bad MPG, and poor performance .

No tuning yet, see my broken valve spring thread for details.

I hate to tell you to throw money at the car, but here are a few thoughts: PCV valve ($4.99) stuck open or closed it can effect idle. If you dont drive your car a lot, oil/water vapor sludge can gum them up. For 4 bucks, I would just change it if you never have.

Quote :

I hate to tell you to throw money at the car, but here are a few thoughts: PCV valve ($4.99) stuck open or closed it can effect idle. If you dont drive your car a lot, oil/water vapor sludge can gum them up. For 4 bucks, I would just change it if you never have.

Watch that spring when you open up the hatch. It tries hard to escape!

I think I'll change my fuel filter again. The idle seems improved a little today so it maybe was some crud that hadnt made its way out when I ran out of gas. 5 bucks for a pcv valve wont kill me either....I'll watch the spring, thanks AA n urbs