'93 3.1 cuts out until up to temp

[mikedsera]

I am dealing with a 1993 Pontiac Sunbird SE 3.1L V6. starts fine cold or hot, but from a cool or cold start you may get 0-3 miles before it starts to cut out. Once you let it work out its little cough it runs fine the rest of your trip. I have yet to get an Engine Light(and yes the light works) when I code the Engine I get (code12) which is no code found. Could this be the temp. sensor for the OBD I. (oh a little note, this never happened until I changed the TPS). I have already tried all the basic tune up stuff, fuel filter, plugs, wires, air filter, oil filter, anti-freeze

[penski]

Originally Posted by mikedsera

I am dealing with a 1993 Pontiac Sunbird SE 3.1L V6. starts fine cold or hot, but from a cool or cold start you may get 0-3 miles before it starts to cut out. Once you let it work out its little cough it runs fine the rest of your trip. I have yet to get an Engine Light(and yes the light works) when I code the Engine I get (code12) which is no code found. Could this be the temp. sensor for the OBD I. (oh a little note, this never happened until I changed the TPS). I have already tried all the basic tune up stuff, fuel filter, plugs, wires, air filter, oil filter, anti-freeze

I have run into changing tps and getting cool to cold tip in stumble. This I found was caused from a fair few miles of use and the throttle shaft sucking vacuum through the tps, the problem being most of the airtight sealed weatherpack connectors are lightly coated with di-electric grease to prevent corrosion, the vacuum sucks the grease through the tps into the brush contacts of the tps causing a dead spot, the reason it goes away when warm is because the grease gets thinner and doesn't obstuct the contacts. It also won't set a code because the engine ECM is still in open loop. The answer is to take the rubber seal out from between the throttle body and tps, let it vent the vacuum.

Hope it helps good luck.
Penski

[97cavalier]

also a car that old, check the cat to make shure it is not blocked.

[richtazz]

It sounds like a sticking or slow responding EGR valve to me. It's not sticking enough to trip a CEL, but enough to make teh car stumble. It doesn't act up when cold or for the first couple of minutes because the computer is still in open loop and not signalling the EGR to open. Once it does, it acts up until the EGR frees itself.