Randomly dies
Thread Starter
Racer
Joined: Feb 2016
Posts: 319
Likes: 4
Randomly dies
This just started 2 days ago I was decelerating and the engine just stoped. There was power to everything and I was able to start it up before the car got to the stop sign. It has happened 3 times not all at low speed and will start right up. 88 corvette. Any help would be nice. Oh by the way. The tank had about 1/4 left
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
When it dies, does it feel more like it is running out of gas or does the ignition just cut out and do the dash light stay on after it dies,
This will tell us if it is more electrical or fuel related.
This will tell us if it is more electrical or fuel related.
Zen Vet Master Level VII
Joined: Mar 2016
Posts: 5,218
Likes: 1,174
From: Southlake, TX
If it only happens on deceleration, my guess is that it is the fuel pressure regulator. The FPR is vacuum operated (adjusted actually) and the decrease in engine rpm lowers the vacuum, closing the FPR and limiting the fuel flow.
Acceleration and normal speed apparently gives tyour FPR enough to "hold" steady. If the car accelerates normally and drives steady just fine my guess is that your pump is doing its job.
You can always check your fuel pressure and bench tests the FPR with a gauge. Put the gauge on the schrader valve and increase the speed at idle. Keep an eye on the the pressure. Then release the throttle to idle and see what the pressure does- it should remain pretty steady.
Just my guesses at this time...
Acceleration and normal speed apparently gives tyour FPR enough to "hold" steady. If the car accelerates normally and drives steady just fine my guess is that your pump is doing its job.
You can always check your fuel pressure and bench tests the FPR with a gauge. Put the gauge on the schrader valve and increase the speed at idle. Keep an eye on the the pressure. Then release the throttle to idle and see what the pressure does- it should remain pretty steady.
Just my guesses at this time...
Le Mans Master
Joined: Dec 2005
Posts: 8,584
Likes: 972
From: Communist Colorado
My guess is you added more fuel to the tank....???? If you did, maybe the problem is in the fuel tank at the rubber fuel line connecting the hard line of the fuel assembly unit to the pump itself. Its about a 4" section of fuel line that could be split.
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Racer
Joined: Jun 2017
Posts: 343
Likes: 18
From: Newport News VA
I went through this exact same situation with my 89. Car would run amazingly strong as long as I was cruising or getting on it. As soon as I would let off and put the clutch in to cruise, RPMs would just trickle down and stall out, electronics all still on and would fire back up. I tracked it down to a bad FPR, pressures would drop under acceleration and then fall more once it let off. Pressures in the rail would bleed down to 0 within minutes. I replaced the FPR and pump since they were both original pieces. All in $70 fix and an afternoon of time.
I had a friend of mine with an L98 vette that had a similar issue as well. Turns out multiple of his original Multec injectors were sticking and creating a rich condition at lower RPMs and stalling the car. Just more food for thought.
I'm curious about the ICM fix though, my next project is replacing the electronics in the distributor. My idle gets a little lumpy after some heat gets in the engine.
I had a friend of mine with an L98 vette that had a similar issue as well. Turns out multiple of his original Multec injectors were sticking and creating a rich condition at lower RPMs and stalling the car. Just more food for thought.
I'm curious about the ICM fix though, my next project is replacing the electronics in the distributor. My idle gets a little lumpy after some heat gets in the engine.
Thread Starter
Racer
Joined: Feb 2016
Posts: 319
Likes: 4
Originally Posted by 81c3
My guess is you added more fuel to the tank....???? If you did, maybe the problem is in the fuel tank at the rubber fuel line connecting the hard line of the fuel assembly unit to the pump itself. Its about a 4" section of fuel line that could be split.
Safety Car
Joined: Sep 2004
Posts: 3,953
Likes: 550
From: Mission Viejo CA
In our 'vette's, closing the FPR would increase the fuel pressure.
Mike, we need to see the results of your fuel pressure test, and how soon does the pressure drop off?
