93 SW2 running extremely rough until warmed up.

[George Wilson]

checked tps, good checked cts. good i know it has a vacuum
leak somewhere but that shouldnt be the issue here i dont think.
sometimes it doesn't run rough at all during startup, but most of the
time i cant put it in gear without it dying, runs fine once its warmed
up. i think it could be that its not getting enough fuel for the
warming up proccess, which needs to be rich, and once it leans out its
getting sufficiant fuel. could a saturn technician help me please.
TIA
Mike

 

[Mike]

Check out the coolant temp sensor - the one that send temp info to the PCM
(not to the temp gauge). If the PCM thinks the engine is already warm, it
won't give it the added fuel it needs when it is cold. This is not an
uncommon problem to come across, and a fairly cheap and easy fix.

 

[George Wilson]

Thank you for your input. Is there any way to check the coolant temp
sensor?

 

[Nick Hull]

Just take it to your local (NOT Saturn) garage and they should check it
for free. The dealer will check it for $75.