I have a 1991 Lumina Euro 3.1 that starts and runs great when it's cold. If you
warm it up and shut it off for
5+ minutes, then it will crank over and try to start but
stall. Does this about 3 times before it finally starts and the RPMs go up to
2000 for a few seconds before slowly settling back down.
If you shut the car off and immediately start it back up it starts fine. It
also runs fine all the time once it starts.
Not sure how long it needs to sit, but once it sits overnight it always starts
right up the next day.
Any ideas? It's giving no service codes(none that I can get anyway). Thanks in
my first guess is the fuel pressure regulator is slowly leaking down.. when
it sits for 5 to 10 minutes, it fills up the wrong side of the
regulator(vacuum line side), and even fills the line up a little... if it
sits overnight, it probably evaporates, or in a cold start, it probably
likes the extra shot of fuel anyways... but on a hot start, the fuel kinda
makes it cough and stall a few times... not to mention that if you loose
fuel pressure with a hot engine, the fuel in the rail boils and fills the
lines with air making you start it multiple times to force the air out...do
you have a fuel gauge with the quick connect needed??? Bobo
If you warm it up and shut it off for
up to 2000 for a few seconds before slowly settling back down.
Thanks for the replies. I had done some research and came across this as well,
but didn't understand why. Makes sense now. Unfortunately, I do not have a
guage and connector. Can I disconnect the vacuum line and check for leakage(as
Dave suggested)? Is it a big job to replace the regulator?
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