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Old 09-28-2006, 06:57 PM
tomfree99 tomfree99 is offline
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91 sonoma wont flash trouble codes

Have 91 Sonoma 2.5 4 cylinder. Occasionally when start up check engine light stays on for a while , then goes off, or goes off if restart.
Problem is when I try to check trouble codes, computer will only flash 1 time, Will not enter diagnostic mode. Possible dead ecm ? What controls spark advance and retard? Have trouble with spark knock all time.

Last edited by tomfree99; 09-28-2006 at 10:03 PM.
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Old 09-29-2006, 08:51 AM
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rlith rlith is offline
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Re: 91 sonoma wont flash trouble codes

Quote:
Originally Posted by tomfree99
Have 91 Sonoma 2.5 4 cylinder. Occasionally when start up check engine light stays on for a while , then goes off, or goes off if restart.
Problem is when I try to check trouble codes, computer will only flash 1 time, Will not enter diagnostic mode. Possible dead ecm ? What controls spark advance and retard? Have trouble with spark knock all time.
Stop by advance or autozone and use one of their ODBI scanners and see if that works.
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