90 Start Die then No Start
Thread Starter
Racer
Joined: Oct 2000
Posts: 476
Likes: 0
From: Socorro New Mexico
90 Start Die then No Start
I just poured over all the archived "start" threads and did not find what I was looking for and I know that it has been discussed.
1. Vette always fires right up when cold and runs fine.
2. When it is all warmed up after a drive, park it for a few minutes.
3.1 Then come back, it starts right up, runs long enough to back out of a parking spot then dies. :mad
3.2 Cranks over just fine but will not fire. While checking for a spark, I got a good jolt :cuss It does not smell like it is flooded (subjective on my part)
3.3 Give it about 5-10 minutes and it starts right up and runs like nothing ever happened.
4. I'm getting to my witts end on this thing.
5. I may have to spend some $$$ instrumenting this if I can't find the answer the easy way. Electric fuel pressure guage. Devine a circuit to confirm that the injectors are being pulsed, and monitor the spark without raising the hood.
I know that this has been discussed before, anybody up to refreshing my memory?
Thanks. The mind you save maybe mine :lolg:
1. Vette always fires right up when cold and runs fine.
2. When it is all warmed up after a drive, park it for a few minutes.
3.1 Then come back, it starts right up, runs long enough to back out of a parking spot then dies. :mad
3.2 Cranks over just fine but will not fire. While checking for a spark, I got a good jolt :cuss It does not smell like it is flooded (subjective on my part)
3.3 Give it about 5-10 minutes and it starts right up and runs like nothing ever happened.
4. I'm getting to my witts end on this thing.
5. I may have to spend some $$$ instrumenting this if I can't find the answer the easy way. Electric fuel pressure guage. Devine a circuit to confirm that the injectors are being pulsed, and monitor the spark without raising the hood.
I know that this has been discussed before, anybody up to refreshing my memory?
Thanks. The mind you save maybe mine :lolg:
Team Owner
Joined: Mar 2001
Posts: 54,124
Likes: 30
From: Cincinnati, Oh USA
Re: 90 Start Die then No Start (Rynda)
Well, you have the right ideas. Engines need spark (and at the right time) , fuel, and air (and in the right ratio) to start and run. When your engine will crank, but won't run, then one or more of these ingredients is missing and to solve this mystery, you have to determine which it is. Good luck.
I only see an intermittent condition temperature related here, no other big clues.
I only see an intermittent condition temperature related here, no other big clues.
Thread Starter
Racer
Joined: Oct 2000
Posts: 476
Likes: 0
From: Socorro New Mexico
Re: 90 Start Die then No Start (gpagaduan)
Nope, no codes, as clean as a whistle.
I cleaned the EGR valve and ordered a new one (not here yet). Forgot to reattach the vaccum hose to the valve and after driving for a week, I got the code that said the O2 reading was out of limits. Reattached hose and that cured that. So the ECM is catching things.
I colud suck air (slightly) through the EGR valve. I'm hoping that with a small leak and maybe sticking a little once in awhile, the mixture is to lean right after start up under these conditions.
Maybe when the engine is cold and in open loop, the mixture is rich enough, and while still driving and warmed up, it expectssome EGR anyway.
The idle has a slight roughness to it (and I mean slight), which I was passing off to 137K miles. So I'm hoping that the new EGR valve is the silver bullet, If not I'm gonna have to buy some stuff and some of those cool windshield piller guage poods. I mean "Honey I have to buy this stuff, think of all the money I'm saving by not taking it to a shop" :D
I cleaned the EGR valve and ordered a new one (not here yet). Forgot to reattach the vaccum hose to the valve and after driving for a week, I got the code that said the O2 reading was out of limits. Reattached hose and that cured that. So the ECM is catching things.
I colud suck air (slightly) through the EGR valve. I'm hoping that with a small leak and maybe sticking a little once in awhile, the mixture is to lean right after start up under these conditions.
Maybe when the engine is cold and in open loop, the mixture is rich enough, and while still driving and warmed up, it expectssome EGR anyway.
The idle has a slight roughness to it (and I mean slight), which I was passing off to 137K miles. So I'm hoping that the new EGR valve is the silver bullet, If not I'm gonna have to buy some stuff and some of those cool windshield piller guage poods. I mean "Honey I have to buy this stuff, think of all the money I'm saving by not taking it to a shop" :D
Safety Car
Joined: Feb 2002
Posts: 4,212
Likes: 10
From: Sun City West Az
Re: 90 Start Die then No Start (Rynda)
Starts up cold but craps out after warm up...sounds a bit like a fuel pump on its way out. Invest in a fuel pressure guage and check the pressure when it stalls. I'm not sure what the numbers are for a 90 but the pressure should be up around 40psi and hold for a time after shut down. Maybe someone will jump in here with your correct fuel pressure.
[Modified by ittlfly, 9:53 AM 4/20/2003]
[Modified by ittlfly, 9:53 AM 4/20/2003]
Advanced
Joined: Aug 2000
Posts: 97
Likes: 0
From: St Paul MN
Re: 90 Start Die then No Start (Rynda)
FWIW - I've had a similar problem in a different GM vehicle I've owned. It was the HEI module at the bottom of the distributor. However, it would do it when it got hot, not just for a hot restart. If you run out of ideas, it may be worth while to check.
Ted
96 CE LT4 Z51
Ted
96 CE LT4 Z51
