Hard starting on my 88 after warmup
08-09-2007, 12:25 AM
#22
08-09-2007, 07:21 AM
#23
Team Owner
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Location: Orlando FL
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St. Jude Donor '08-'09
I had a similar problem on my 90. Started great cold but took 5-10 seconds of grinding to start. I did all of the FSM fuel pressure tests and it looked like my injectors were leaking. I sent them to Rich at Cruzing Performance and he said they were fine and shipped them back.
After some digging around I found that the fuel pressure diaphram was leaking gas into the top of the regulator housing and from there into the plenum thereby flooding the engine.
I am not familar with the 88 but I believe it has a similar fuel pressure regulator. My suggestion is to run the engine for a few minutes, shutdown, then pop the plenum hose off of the regulator and see if gas comes out. If is does you have a bad diaphram. ($35 at Autozone)
Its a simple test and may reveal the problem.
After some digging around I found that the fuel pressure diaphram was leaking gas into the top of the regulator housing and from there into the plenum thereby flooding the engine.
I am not familar with the 88 but I believe it has a similar fuel pressure regulator. My suggestion is to run the engine for a few minutes, shutdown, then pop the plenum hose off of the regulator and see if gas comes out. If is does you have a bad diaphram. ($35 at Autozone)
Its a simple test and may reveal the problem.
After a tune up it was fine, but is back to doing it again, and getting worse.
My 1st thought is leaking injectors (130K miles), but this idea would also be a time/money saver too since I don't think that has ever been replaced either.
Thanks for the tip!!
08-09-2007, 07:31 AM
#24
I am having the same issue for a long while now.
After a tune up it was fine, but is back to doing it again, and getting worse.
My 1st thought is leaking injectors (130K miles), but this idea would also be a time/money saver too since I don't think that has ever been replaced either.
Thanks for the tip!!
After a tune up it was fine, but is back to doing it again, and getting worse.
My 1st thought is leaking injectors (130K miles), but this idea would also be a time/money saver too since I don't think that has ever been replaced either.
Thanks for the tip!!
08-09-2007, 08:55 AM
#25
Le Mans Master
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Great timing with this thread. I'm fighting a very similar issue with my GTA right now. Many people have suggested injectors, but it never dawned on any of them (nor me) to check the CTV. One question though... how long does it take for the leaking gas to evaporate? My car will start beautifully when cold, or if it's only been shut off for a minute. But, anything from say 10 or 15 minutes all the way to 4-6 hours later, it will crank forever, then I've got to give it some gas to get it to "catch" and slowly start up. I put a fuel pressure gauge on it, and after about 30-40 minutes my pressure bleeds down to about 20lbs. Is that slow of a pressure bleed potentially allowing enough gas into the motor to cause a hard start 4-5 hours later?
08-14-2007, 05:05 PM
#26
Drifting
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Location: Sacramento, CA Money can't buy happiness - but it's more comfortable to cry in a Corvette than a Yugo.
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Great timing with this thread. I'm fighting a very similar issue with my GTA right now. Many people have suggested injectors, but it never dawned on any of them (nor me) to check the CTV. One question though... how long does it take for the leaking gas to evaporate? My car will start beautifully when cold, or if it's only been shut off for a minute. But, anything from say 10 or 15 minutes all the way to 4-6 hours later, it will crank forever, then I've got to give it some gas to get it to "catch" and slowly start up. I put a fuel pressure gauge on it, and after about 30-40 minutes my pressure bleeds down to about 20lbs. Is that slow of a pressure bleed potentially allowing enough gas into the motor to cause a hard start 4-5 hours later?
