Have code 34 and 42 . runs good with ESC disconnected .high idle.
Jan 24, 2019 at 1:25 PM
Codes 34 and 42
1989 CHEVROLET TRUCK
LIONFAN
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- 6 POSTS
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Repair Safety Notice:
This information is for general instructional purposes only. Vehicle repair can be dangerous.
Verify all information, follow manufacturer service procedures, use proper tools and safety equipment,
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Hello, I'm Danny.
Sounds like you might be having a problem in the E.S.T or ignition module. I've attached two pictures below as a diagnostic aide. Here is a tutorial on how to test wiring:
https://www.2carpros.com/articles/how-to-check-wiring
Hope this helps and thanks for using 2CarPros.
Danny-
Sounds like you might be having a problem in the E.S.T or ignition module. I've attached two pictures below as a diagnostic aide. Here is a tutorial on how to test wiring:
https://www.2carpros.com/articles/how-to-check-wiring
Hope this helps and thanks for using 2CarPros.
Danny-
Images (Click to enlarge)
Jan 25, 2019 at 12:10 AM
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Hello,
I found the wiring diagrams so you so use the guide above. I have seen the ECM go bad causing the this issue. FYI.
I found the wiring diagrams so you so use the guide above. I have seen the ECM go bad causing the this issue. FYI.
Images (Click to enlarge)
Jan 25, 2019 at 2:16 PM
Thank you.
Jan 26, 2019 at 7:20 AM
Please let us know what you find. We are interested to see what it is.
Jan 28, 2019 at 7:28 PM
Truck now has uncontrollable spark knock.
Jan 28, 2019 at 7:42 PM
Truck now has uncontrollable spark knock
Jan 28, 2019 at 7:43 PM
What did you do for repairs? did you swap out the ECM?
Jan 29, 2019 at 11:38 AM
Checked all the basics; vacuum lines, wiring, new pugs, cap, rotor and wires. check timing. had the truck eleven years was going to give it to son in law before it lost its mind. do not like spending money to give it away. just want to get the right part not all of them!
Jan 29, 2019 at 1:36 PM
No problem send the ECM out to a rebuilder and have them check it.
Jan 30, 2019 at 9:59 AM
Thanks.
Jan 30, 2019 at 10:55 AM