1991 Buick Skylark restarting when warmed up

HOTROD427

MEMBER
1991 BUICK SKYLARK
6 CYL
FWD
AUTOMATIC
112,000 MILES

The car will not restart after driving for a while on a hot day. It will start immediatley after you shut it off but let it set for 15 minutes it won't start. On a cool day never a problem. I have already done the 3 coil paks, module under them, crank sensor, complete tune up, computer, fuel filter, after the car sits for 30 minutes it will go ahead and start and run fine, it will never quit as long as it is runnig, I will gladly donate some money if you can help me out ! It is still a great car except this one problem Thanks in advance Mike

2 Replies

SERVICE WRITER

MECHANIC
9,123 POSTS

Try to mist some cold water or a damp washcloth with cold water on the crankshaft position sensor or other suspected component to cool it down and see if she fires up.

You need to identify what is missing when it isn't starting, that is spark and or fuel as well as fuel injector pulse.

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Wednesday, June 11th, 2008 AT 2:59 PM

DOCFIXIT

MECHANIC
18,828 POSTS

You might be experiencing a "hotsoak condition" this is caused by the fuel injectors leaking fuel into the intake and after a few minutes it becomes flooded and will not start. Let set fuel evaps and bingo it starts. You can test this by attaching a pressure gauge run engine shut off then watch gauge to see if pressure drops it should hold for 30 to 45 min. If it drops off quickly there is your problem. You can have them cleaned if this solves the problem fine just add a fuel cleaner every 15 tankfulls. If cleaning does not work replacement will be necessary.
Good luck and let me know

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Wednesday, June 11th, 2008 AT 3:09 PM