Just popped two codes 34 and 42
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Joined: Jul 2012
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From: Newfoundland
Car: 1989 Iroc Z
Engine: 5.7 L98 G92
Transmission: 700r4
Axle/Gears: 3.27
Just popped two codes 34 and 42
Ok where do I start first to try and find the problem Car popped codes the other night..Car ran fine... and when I went to check codes they were gone. Started the car this morning and codes showed up again... car '89 5.7 iroc
Joined: Jan 2009
Posts: 887
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From: Golden, CO
Car: 87 IROC
Engine: L31 350
Transmission: T56
Axle/Gears: 4.10 D44
Re: Just popped two codes 34 and 42
The native search isn't as good as Google's engine for short search terms... At Google, enter "site:thirdgen.org code 34" and this was the second link.
https://www.thirdgen.org/forums/tpi/...4-how-fix.html
And for 42...
https://www.thirdgen.org/forums/tpi/...code-42-a.html
Which lead to this, a troubleshooting flow chart...
http://www.chevythunder.com/est_code_42.htm
34 = low map voltage.
42 = ESC = Electronic Spark Control
https://www.thirdgen.org/forums/tpi/...4-how-fix.html
And for 42...
https://www.thirdgen.org/forums/tpi/...code-42-a.html
Which lead to this, a troubleshooting flow chart...
http://www.chevythunder.com/est_code_42.htm
34 = low map voltage.
42 = ESC = Electronic Spark Control
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