1988 Chevy Silverado code 42

Tiny
JHENRIKSEN
  • MEMBER
Well, I think I got it, I started looking at the wires and all the connections, and noticed that the EST wire had a flat spot in it from being pinch under the black cover that covers all those electrical goodies on the firewall. So I replaced that section of wire, cleared the code, drove it around for a bit, seems to be fine now. I even checked the timing again just to make sure. And yes I cleared the code again after I check the timing. Thanks guys for your help.
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Monday, October 22nd, 2018 AT 7:19 PM (Merged)
Tiny
KHLOW2008
  • EXPERT
This means the problem is most likely intermittent and could be due to a loose wire, ECM or the charging system.

The chart below shows how to go about testing the circuit.
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Monday, October 22nd, 2018 AT 7:19 PM (Merged)
Tiny
SATURNTECH9
  • EXPERT
Your welcome thats what were here for nice find. Hope you have safe and happy new year.
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Monday, October 22nd, 2018 AT 7:19 PM (Merged)
Tiny
GOOFAN87
  • MEMBER
Hi
I borrow this thread, hope it s OK. I have the same problem with my TBI code 42. And I have checked the Pin A blk/red from the control module to ground and theres no ground there. Is my ECM bad or can I hook this blk/red cable directly to ground and see if this solve my problem?
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Sunday, November 11th, 2018 AT 1:07 AM
Tiny
KEN
  • ADMIN
Yes, try to introduce a new ground to see if that fixes it. If not I would try a used/rebuilt ECM. Please let us know what you find we are interested to see what it is.

Cheers, Ken
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Tuesday, November 13th, 2018 AT 11:20 AM

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