C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

limp home mode

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Old Sep 12, 2006 | 08:52 PM
  #1  
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From: Gilbert Az
Default limp home mode

Car has gone into limp home mode again
Had issues with MAS in past however this seems different
Question is I put a timing light under this rough idle and it's miss firing to the point it fires now and then.
Is this the way limp home mode works or do I have another problem?
It's a 1989 and it is blowing black smoke and using fuel at an incredable rate.surging at any speed,and not holding an idle.The light is showing up before the timing plate and only firing now and then

Last edited by wjmac40; Sep 12, 2006 at 10:05 PM.
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Old Sep 12, 2006 | 10:11 PM
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What code is showing?
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Old Sep 12, 2006 | 10:21 PM
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From: Gilbert Az
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Thats the thing ,I'm getting no code at this point
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Old Sep 13, 2006 | 09:45 AM
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I'd start with a fuel pressure test..could be you have some bad injectors. Next I'd pull the ICM and have Autozone check it....while it's out Ohm your pickup coil.
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Old Sep 13, 2006 | 10:00 AM
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I would think if it's truly limp home mode, you'd have a code stored. Fuel or spark is a good place to start, as suggested by Rick.
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Old Sep 13, 2006 | 05:39 PM
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I had some similar problems with my 89. I wasn't getting any codes either, finally when I unhooked the scan tool and rehooked it up I got a Code 43 (think it was 43) which is the EST (electronic spark timing) I replaced the module and all was fine. I would also check the knock senor.
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Old Sep 14, 2006 | 12:15 AM
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did you try disconnecting the battery to see if it comes back? how do you know it is in limp home mode?

Shawn
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