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Old 10-11-2005, 05:48 PM   #1
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Default engine trbl

Hi guys-hope you can help. My first series 3.8 is unhappy-cuts out badly under 1700rpm.Won't idle. At 1500rpm it cuts out intermittantly, below that more frequently until stall. No codes from computer (except 12). Replaced MAF and fuel press reg on spec.Above 1700 rpm it is happy as a lark. Ideas?

Thanks!

PS: I adjusted the crank sensor as it has been contacting the interupter, seemed to make it worse, so I ordered a new one.We'll see.

Replaced crank sensor but still ran poorly, then ECM gave code 42. Replaced ICM but won't stay running. Probably flooded now, trying reset.

Replaced fuel filter and sparkplugs on spec. Back to original problem but misses above 2000 rpm now. Seems to flood easily. I am thinking injector trouble.
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Old 10-18-2005, 05:37 PM   #2
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Have you replaced the ECM or at least tested with another ECM from an 87 with a 3.8?

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Old 10-18-2005, 05:45 PM   #3
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From your other thread:

Quote:
Originally Posted by csrc
See previous post "engine trbl". I have dropped $600 in parts and at the moment, it won't run. I am leaning towards bad injectors. Question: how does one check whether the timing chain has jumped? I have caused several backfires in my process.

Thanks!

1987 se bone stock.
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Old 10-19-2005, 07:29 AM   #4
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Default engine trbl

Thanks for your reply. No, I have not tried the ECM yet. At the moment it won't run, but will try to start. This supports your suggestion, as the ECM takes over from the ICM above 600rpm. I was about to rip out the injectors and have them tested but perhaps the ECM idea would be less painless. Is there any practical way to check if the timing chain has jumped? I have managed to cause a few backfires.
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Old 10-19-2005, 10:19 AM   #5
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Default Re: engine trbl

Quote:
Originally Posted by csrc
Thanks for your reply. No, I have not tried the ECM yet. At the moment it won't run, but will try to start. This supports your suggestion, as the ECM takes over from the ICM above 600rpm. I was about to rip out the injectors and have them tested but perhaps the ECM idea would be less painless. Is there any practical way to check if the timing chain has jumped? I have managed to cause a few backfires.
Only way I can think of is to pull the timming cover...

Let me explain a few things...

The 87'* came from the factory with an alluminum timming gear that had Nylon teeth on it... If it was replaced it would have an all steel gear.... If memory serves the 88'* should have the steel gear( Vin 3 )... So out of time is a possibility...

Its hard to say what the problem is going to be as we can't be there to look at the car and see what its doing...

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Old 10-19-2005, 06:04 PM   #6
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Default engine trbl

Replaced ECM and reused PROM. Won't start-sounds to me like I haved jumped the chain. I guess I will have to bite the bullet and pull off the front end. Fortunately, most of the stuff I have done so far needed doing, that extends to the timing chain if it did jump. My wife loves the car so I guess it'* worth it. Unfortunately, if I get close to $1500 in repairs, I might have been able to buy a better one!!!!
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Old 10-19-2005, 06:07 PM   #7
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Default Re: engine trbl

Quote:
Originally Posted by csrc
Replaced ECM and reused PROM. Won't start-sounds to me like I haved jumped the chain. I guess I will have to bite the bullet and pull off the front end. Fortunately, most of the stuff I have done so far needed doing, that extends to the timing chain if it did jump. My wife loves the car so I guess it'* worth it. Unfortunately, if I get close to $1500 in repairs, I might have been able to buy a better one!!!!
You are right... For 1500 you could almost buy a better one...

I'm not sure whats haoppening with your car... I always say I wish i could look at it...

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Old 10-20-2005, 07:41 AM   #8
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Default engine trbl

At this point, I may have already fixed the trouble but caused another. If I am right, then the timing chain needed doing. Is it neccessary to raise the motor (as per my factory manual) to remove the cover?
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Old 10-20-2005, 09:51 AM   #9
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It may help you to unbolt the mounts on the passenger side of the engine so you can place a board of wood on a floor jack and jack the engine up and down a bit... Will most likely aid you .... But I don't think its necessary to do so...

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Old 10-22-2005, 04:51 AM   #10
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So, I am at work doing an overtime shift (to pay for the parts!) when my tow truck buddy shows up to move the car to another buddy'* place where I can do the work. Buddy #1 has another buddy who does mechanical work with him and the two of them set to. They get it running and tell me all they did was crack the fuel rail port to check for pressure and adjust the crank sensor (I am not buying this, I set it up carefully) and it ran fine. My wife phones me and tells me the news. I tell her to go try it herself. Won't start.
Here'* the thing. They relieved the fuel pressure. I wonder if my return line is plugged. I know - if I had checked the fuel pressure I would have discovered this. I will try to get a guage tomorrow. For now, though, I think I will have a drink.
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