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91' runs great until warm

Forum: C4 Engines, Driveline and Handling

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91' runs great until warm

Posted: 5/27/11 6:39amMessage 1 of 5
s
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I have been having problems with my 91' and looking for some advice.  I have taken it out several times since being stored for the winter for about 15-20 min trips.  Towards the end of the trip the engine starts to run/idle rough.  Once I shut the car off I have to wait until the engine is completely cool until it will start and run again.  It will crank and crank but not fire until it is cool.  The SES light is not on.  Has anyone else encountered this problem?
 
Thanks.
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91' runs great until warm

Posted: 5/27/11 8:15pmMessage 2 of 5
e
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Lanoka Harbor, NJ - USA
Joined: 12/21/2006
Posts: 2191
Vette(s): 1975 metallic blue coupe with t-tops,L48, t/t steering, black leather interior. 1990 L98, white/red leather interior, auto,a/c
might want to check your fuel pressure. i put in an adjustable regulator and not realizing it set the pressure to high. was ok on a cold start but when it warmed up it wouldn't start. readjusted it and everything was fine.
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91' runs great until warm

Posted: 5/28/11 9:11amMessage 3 of 5
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/ Am-Fm/map light National/Regional/Chapter NCRS "Top Flight" #2-1985 Bright Red/Carmine Cp.L-98/auto Member: NCRS, NCRS Texas, Corvette Legends of Texas
I would be most suspicious of the HEI module, or the coil, first. It could also be a fuel problem. Best way to check that would be to install a pressure gauge on the fitting, and see what the pressure is when it starts cold, and then compare it to when it shuts down/won't start. Could be that the fuel pump is on it's way out, or maybe the "sock" filter on the end of the pick-up tube is sucking up crap from the tank, and stopping it up.

My bet is on the HEI module, from the description of the problem....

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91' runs great until warm

Posted: 7/30/11 12:50amMessage 4 of 5
v
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My bet is on the injectors.
If they haven´t been replaced/cleaned previously.
Easy check is to measure resistance on them.
Just remove the clip on them, put the leads of a voltmeter (ohm scale) on the injectors contacts.
Cold, they should all read around 16 ohms, warm a bit higher (?).
Thing is, they should all read about the same.
I would bet you have one or two reading really low, like 5-9.
Are they grey colored, they would be the original ones, GM put them in the 89-90-91 models with a (then) better design.
Turned out they weren´t.
Almost everyone with those MULTEC´s have replaced them with better ones.

This is safe place to order them, http://fuelinjectorconnection.com/shop/
If it´s your problem of course.
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91' runs great until warm

Posted: 7/30/11 6:56amMessage 5 of 5
s
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I ended up replacing the injectors.  They were original.  While I had everything apart I decided to replace all 8.  What a difference it made.
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