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Post by indkid87 on Mar 5, 2014 20:40:59 GMT -5
91, fuel injected.
The car starts, runs at about 2k rpm for about 30 seconds. Then it picks up about 500 rpm and dies.
Spark is good, fuel pressure is about 39, fuel pump stays running for a bit after it dies. It still has almost a half tank of gas.
I'm going to try swapping out the ecu tomorrow and hope that fixes it. It's almost like the injectors shut off because the fuel pressure spikes right after it dies.
Any ideas?
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Post by blacklight on Mar 6, 2014 6:16:57 GMT -5
91, fuel injected. The car starts, runs at about 2k rpm for about 30 seconds. Then it picks up about 500 rpm and dies. Spark is good, fuel pressure is about 39, fuel pump stays running for a bit after it dies. It still has almost a half tank of gas. I'm going to try swapping out the ecu tomorrow and hope that fixes it. It's almost like the injectors shut off because the fuel pressure spikes right after it dies. Any ideas? A bad fuel pressure regulator or it's vacuum-feed line?
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Post by indkid87 on Mar 6, 2014 9:11:06 GMT -5
Thanks, I'll try swapping out the fuel rail and injectors if the ECU doesn't help.
I had been raising and lowering the engine to fix rust on the inside frame rail, so something could have gotten pinched or disconnected too.
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Post by gearheadeh on Mar 6, 2014 12:00:28 GMT -5
I'm not sure if this is relevant, but It is acting like a breaker is tripping and resetting. That is how I would describe the problem I had after swapping in a different engine into an EFI car. I would get 1 spark when cranking it over and then no sparks at all. I would check wiring and or wait a bit of time and again as soon as I started cranking it over the plugs would fire once and only once. Drove me crazy till I found the ground under the intake manifold. Once I hooked up that 1 small ground wire to the support bar for the intake, Boom it started right up.
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Post by indkid87 on Mar 6, 2014 19:03:14 GMT -5
Well it wasn't the ecu. I didn't have time to try anything else.
I checked the grounds and cleaned them, that didn't help either.
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Post by Armageddous on Mar 7, 2014 2:02:47 GMT -5
Does it not restart after it dies? Sounds heat related to me, could be a bad catalytic converter, distributor pick up, main EFI relay.. You need a better idea of what is happening when it dies.
Terry
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Post by indkid87 on Mar 7, 2014 9:06:57 GMT -5
It restarts easily after it does, but does the same thing. I don't think it gets hot enough for it to be heat related.
I have no cats, I don't think it's distributor because it still has spark when it dies.
I can check the relay, I'm thinking it's fuel related. It seems to run rich in the short amount of time it does run.
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Post by indkid87 on Mar 7, 2014 19:19:15 GMT -5
Well I finally had time to take a good look at everything today and I found the problem. It's so dumb I don't want to post it, but I will in hopes that I'll save someone else the suffering.
It turns out the hose for the MAP sensor was unplugged. I plugged it back in and it runs like a champ.
Thanks for all the help everyone, -Dave
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Post by gearheadeh on Mar 7, 2014 20:45:12 GMT -5
Well I finally had time to take a good look at everything today and I found the problem. It's so dumb I don't want to post it, but I will in hopes that I'll save someone else the suffering. It turns out the hose for the MAP sensor was unplugged. I plugged it back in and it runs like a champ. Thanks for all the help everyone, -Dave Well now, it is good to hear that it is running again. I think what happened to you has happened to more people than you would think.
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Post by Armageddous on Mar 9, 2014 2:30:18 GMT -5
I'm pretty infamous for doing large repairs at work and usually leaving the MAF sensor unplugged, then wondering why it won't run. D'oh.
Terry
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Post by indkid87 on Mar 12, 2014 13:18:56 GMT -5
I'm pretty infamous for doing large repairs at work and usually leaving the MAF sensor unplugged, then wondering why it won't run. D'oh. Terry I did that on my infiniti once, it ran, but would cough and sputter as soon as you gave it gas. The good news out of all of this is that I found out my spare ecu that I thought I fried still works. The gasket for the wiring harness that goes through by the strut was loose. It dumped water directly on the ecu in the rain.
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Post by tomati88justy on Jul 7, 2014 5:05:21 GMT -5
check all you vacuum lines
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