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Posted

hi everyone i am working on a 94 pontiac grand prix 3100 v6. If the car sits for anything over an hour it hesitates and stalls on startup. Once it warms up it runs perfectly fine. Things i have changed are the plugs, wires, fuel filter. If someone could give some ideas i would highly appreciate it. thanks :mrgreen:

Posted

I'd say O2 sensor, but I don't think the car even looks at the O2 sensor until it's warmed up.

Posted

The car has to reach a certian temp for the ECM to read the o2 sensor.

 

So basically when the car is cold? it does this

Posted

sounds like a coolant temp issue... Sensor is prolly bad... Or weak fuel pump, which is pretty common... Check for proper fuel pressure and volume..

Posted

yeah i am gonna lean towards a feul pump or a coil pack maybe. tonight when i took it out for a drive it died when i stomped on the gas :eek: lol the weird thing is it starts right back up and goes normal. also when i try to stop for the stop light the rpms jump up and down a little and it stalls :willynilly:

  • 2 weeks later...
Posted

can someone tell me what the resistance is supposed to be for the coolant temp sensor

Posted

I dont know how much this helps but when i went to take it to work this morning it started right up, i drove it up one block and it started acting up, got it started back up and made it 4 blocks to the arterial where it died, i couldnt go any faster than 10 mph because the car would barely run. then about halfway to work it all of a sudden it started running fine. I do not understand this, is this symptom of the CTS or could the o2 sensor be doing all of this

Posted

If the CTS was bad, your ECM would think its -40* outside and you would be blowing black smoke out the tailpipe from running so damn rich. Have you checked your fuel pressure? If not I would suggest doing that.

Posted

well i did that last week and the specs were 11 with key on engine off and 43 with engine running, which isnt too far off factory specs. What the hell could possibly be causing all of this trouble. Oh and there is a few puffs of smoke from under the hood once in a while when the engine dies but nothing out of the normal from the exhaust

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