Car cuts out

[RedWind]

I have a 1991 Camaro V6 3.1 MFI. It will cut out when ideling if ran long enough or if you rev it, it will cut out. I have replace the spark plugs and wires, cap and rotor. also fuel filter and the fuel pump. and nothing seems to be helping. I am starting to lean towards a sensor now. But I am not sure which, or if there is anything else it could be. Does anyone have any ideas?

[wrightz28]

I would take a look at the TPS (throttle position sensor)

[RedWind]

I dont think that is it because for one there sould be a code for it when the circuit is not working and second the ECM sets a default value for it when it does go so you can still drive it eventough it will run like shit

[cuda_dude]

crank sensor?

[RedWind]

there isnt one on it

[wrightz28]

Originally Posted by RedWind

I dont think that is it because for one there sould be a code for it

key words "should be".

[RedWind]

Well I tested it anyway and everything was ok with it except for the ohm at high throtal it dropes a bit but that cant be the problem because I am having the problem at idealing.

[RedWind]

Do anyone have any ideas?

[wrightz28]

IF i am thnking correctly, testing resistance is reverse of voltage, and the dead spot is at idle.

[RedWind]

What are you talking about it is not at idel it is a full throatle I know this because my hand was holding it open

[wrightz28]

Yes, WOT would be max voltage, which in turn should be minimal resistance (ohms)

Just trying to help you out.

[RedWind]

sorry if I came off like an ass didnt mean it like that

[wrightz28]

No problem

So when it 'cuts out', does it fire right back up with no problem?

No other running / driveability issues?

[RedWind]

yeah it starts right back up

[wrightz28]

Originally Posted by RedWind

yeah it starts right back up

Okay, so that pretty much elimnates the famed ignition control mod problem and other ignition related symptoms.

I'm telling ya, it sounds as if the ECM is losing sight of where the throttle or air/fuel ratio is at for a split second and sending it into a fit. Since you've confirmed you do have a dead spot in the TPS, there's a problem already, they're relatively cheap, I'd replace it, and reset the ECM and see how it does.

Believe me, I am definately not one to 'shotgun ' parts, i'm a get it done right the first time. There are a few other things possible to cause this, but you know it has a problem in it, so at the very least it will be eliminated from the picture. Yes, i usnderstand your logic that performance wise, where the spot is located should logicly cause a loss of reference at a open throttle situation, but the overall resistance of the circuit could be lessened, thus creating a 'out of range reference voltage in the TPS circuit'. And as stated before, on GM OBDI systems, it's not too uncommon it will not throw a hard code to set off the CEL.