What are the possible ways of finding out if my car is running lean or rich?

Colin
98 Z28

 

off the top of my head autotap or another scan tool, or get it on deans dyno (plug for ya dean!) FWIW, why are you asking the question?
brian

 

I used a-tap and its showing my O2's at .025 @ WOT. This a far cry from the optimum .9XX (from what I've been told). Its giving me an SES light P0131, P0137, P0151, P0157...all low voltages for the O2's. The O2's are brand spankin' new along with the fuel filter. I'm guessing its running way lean. I'm not sure what to look at from this point. The car is down on power and its very very frustrating seeing that damn SES light. Any help would be much appreciated! Thanks

Colin
1998 Z28

 

are you stock, mods, what? that would help get an accurate answer.
brian

 

The only mods I have are a lid and exhaust. Basically a stock 98 Z28 with close to 80k on it. In some desperate need of guidence Thanks!

Colin
98 Z28

 

You might have a blown fuse or bad ground.

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01Firehawk pewter M6
TNT wet,FLP's,Corsa,MTI clear lid,Tbyrne LCA's PH,KVR cross drilled.TR 220 Cam and other stuff.
12.84 at 108 1.93 60' with stock tires before Cam
370hp/370tq

 

Bad Ground...Oh no .....that sounds like something that will be hard to track down...hope its not that. I'll take a look at the fuses later today. Thanks!


Colin

 

I've also seen the problem you described after the installation of a SLP fan switch.(They wired some wrong)

Also your plugs and wires could be shot.

 

I think I fixed the problem! I took a look at the MAF and the little wires were coated with this black stuff so clean them off gently. Now when I hit the throttle the O2's are reading between .89 and .91 and I haven't received an SES light yet! Thanks for all the help...much appreciated.

Colin
98 Z28

 

Those wires are Ultra sensitive. Usually if you so much as touch them, it will miscalibrate the MAF.


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-Mike
1989 Turbo Trans-Am
|11.25@121|11s For $1000 Bucks|HomePage

1998 Trans-Am LS1 6-Speed
|13.10@106|Mods|296HP/319TQ Stock

 

I used some electronics cleaner and q-tips to clean it. I had not choice really....you should have seen the crap on those wires. I didn't realize how bad it was until this morning....she goes real nice now.

Colin