need help with L98 vette!!!
Thread Starter
Melting Slicks
Joined: Apr 2008
Posts: 3,131
Likes: 12
From: Houston Tx
need help with L98 vette!!!
my buddies 91 vette is having some problems and can't figure out, hope ya'll can help. he was driving it last night and it just died on him. he replaced the module under the cap and put some wires in the wrong spot. he limped it here to my house and i got the wires put on correctly, and yes i'm sure they are correct, 1,8,4,3,6,5,7,2. so after i redid the wiring we took it for a spin and as soon as you get into the throttle it dies. we limped it home again and restarted it. it ran fine and even revved up to like 3500 rpm, but at WOT it dies. after playing with it a min. and trying some other things with the car running it died. now that its hot it turns over and WANTS to start but won't. it is getting fire and the fuel rail is reading 40 psi. i was thinking of just redoing the entire ignition system. any and all help would be appreciated because i don't think a set of wires and plugs is gonna do it.
Le Mans Master
Joined: Oct 2008
Posts: 9,758
Likes: 49
From: Houston Texas
ck your fuel pressure when hot, when cold and at WOT sounds like it's fuel related. Fuel pumps can stop working once they get hot if bad. Also ck the vac line going to the FPR if it has gas in it it needs a regulator.
Good luck
Good luck
Thread Starter
Melting Slicks
Joined: Apr 2008
Posts: 3,131
Likes: 12
From: Houston Tx
the fuel pressure test was done with the car warm. the schrader valve on the fuel rail is AFTER the FPR. if the FPR was out wouldn't i have a low reading on the fuel line pressure? is there a way to test the FPR?
Last edited by crAzy; Feb 8, 2010 at 04:43 PM.
Le Mans Master
Joined: Oct 1999
Posts: 6,366
Likes: 34
I would pull the dist cap and make sure everything underneath was put back right.
Test the coil... although I think they just die. Mine did and left me stranded.
and then back to the wires... triple check em, and I would throw a timming light on it. make sure he didnt move the dist.
How far did he drive with the wires wrong. how wrong were they?
I would probably pull some plugs as well.
Kind of dont really know where to go but it seems by the order of events it would be ingition related.
Test the coil... although I think they just die. Mine did and left me stranded.
and then back to the wires... triple check em, and I would throw a timming light on it. make sure he didnt move the dist.
How far did he drive with the wires wrong. how wrong were they?
I would probably pull some plugs as well.
Kind of dont really know where to go but it seems by the order of events it would be ingition related.
Drifting
Joined: Feb 2008
Posts: 1,537
Likes: 177
From: NE Ohio
2024 C4 of the Year Finalist - Unmodified
check your fuel pressure at wot. The volume of fuel may not be there. I agree it sounds fuel related. Tape a pressure gauge to the windshield the go for a run.
Burning Brakes
Joined: Jun 2008
Posts: 892
Likes: 1
From: New Smyrna Beach Florida
If you have the stock injectors, it's only a matter of time before they go bad.
The ethanol in the fuel eats them up.
Read the 4th sticky down on tech/performance. I got my injectors from Jon at FICINJECTORS. Good guy, and great price.
Whatever you do, DO NOT replace them with Multecs.
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Le Mans Master
Joined: May 2007
Posts: 8,448
Likes: 27
From: Valparaiso
If you have the stock injectors, it's only a matter of time before they go bad.
The ethanol in the fuel eats them up.
Read the 4th sticky down on tech/performance. I got my injectors from Jon at FICINJECTORS. Good guy, and great price.
Whatever you do, DO NOT replace them with Multecs.
Jon at FIC its one of the best things that can ever happen to your car !!!
Melting Slicks
Joined: Dec 2009
Posts: 2,232
Likes: 285
OK, when it dies- check for spark, at the end of the plug wire. Try spraying carb cleaner into the throttle to see if it starts alittle. May need a noid light to test injector pulse, use a long screwdriver touching the injector & put the handle to your ear, should hear them clicking when cranking. Ohm the injectors when hot. Could have a senser affected by heat, may need to have it scanned or try unpugging one at a time to see if it fires at all.
Burning Brakes
Joined: Jun 2008
Posts: 892
Likes: 1
From: New Smyrna Beach Florida
Le Mans Master
Joined: Sep 2009
Posts: 6,937
Likes: 348
From: My interests are mobile
How about don't spray anything in the intake period. It's not a carburated car, and troubleshooting fuel injection doesn't involve those methods. Spraying in volatile fluids only to have it stumble and tumble doesn't tell you anything that can't be determined by proper troubleshooting methods.
Intermediate
Joined: Jun 2009
Posts: 34
Likes: 0
Exact same thing was happening to my 91, had 2 bad injectors on the driver's side. Not saying it couldn't be ignition, but it is so easy to check the coils on the injectors.
