91 sonoma wont flash trouble codes
tomfree99
09-28-2006, 05:57 PM
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.
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.
rlith
09-29-2006, 07:51 AM
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.
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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