HELLO MY 88 JIMMY 4X4 4

1988 GMC Jimmy

Tiny

autohound

November, 7, 2012 AT 3:43 PM

Hello my 88 jimmy 4x4 4.3L just starting to buck and seems to lose power as I reach 45 -50 mph I slow down start to pick up then does the same friend at my local shop hooked it up came up with code 42 timing /spark issue could this be the ICM starting to go bad? Hope you can help! ED
not what I need a my truck acting up good old Sandy wrecked most of what I have already thank god for good friends!

FOUND 49 RELATED QUESTIONS

Trouble Codes 42 & 92

9 ANSWERS
4 IMAGES

Trouble Code 42

27 ANSWERS

1 Answer

Tiny

hmac300

November, 7, 2012 AT 3:53 PM

See the two pic i've enclosed. First one is how to check it second one is schematic so print off both and try to enlarge. Disregard the top above yes as it means to set the code. Just follow it to diagnose it.

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