Error Code 42
04-16-2005, 12:03 PM
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Car: 88 IROC
Engine: 5.O TBI
Transmission: Auto
Error Code 42
Need help trouble shooting a code 42. This is an 88 TBI engine. While in park or in motion car will begin to stall and the check engine light comes on.
Thanks
Thanks
04-16-2005, 12:53 PM
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Car: 89' Iroc-Z G92
Engine: TPI 305 G92
Transmission: T-5
Axle/Gears: Limited 9 bolt, 3.45
42. Fault at electronic spark timing circuit OR
Fault at direct ignition system OR
Fault at fuel cutoff relay circuit
Fault at direct ignition system OR
Fault at fuel cutoff relay circuit
04-16-2005, 12:54 PM
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Car: 89' Iroc-Z G92
Engine: TPI 305 G92
Transmission: T-5
Axle/Gears: Limited 9 bolt, 3.45
42. Fault at electronic spark timing circuit OR
Fault at direct ignition system OR
Fault at fuel cutoff relay circuit
good luck check your distributor they tend to go bad
Fault at direct ignition system OR
Fault at fuel cutoff relay circuit
good luck check your distributor they tend to go bad
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KOHV94 (08-25-2021)
04-16-2005, 01:20 PM
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Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
I have posted this in the past and will post it again. Hope this helps, an item that you might want to cjeck here is the ignition control module.
04-16-2005, 02:36 PM
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Car: 89' Iroc-Z G92
Engine: TPI 305 G92
Transmission: T-5
Axle/Gears: Limited 9 bolt, 3.45
it shouldn't display the code for the icm, mine didn't, I actually am running code 42 right now because my timing is off just check your distribution components
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04-17-2005, 08:39 PM
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Car: 89' Iroc-Z G92
Engine: TPI 305 G92
Transmission: T-5
Axle/Gears: Limited 9 bolt, 3.45
yeah that i learned today, but if it isn't working properly it wont if he is starting and stalling..........
04-18-2005, 03:06 AM
#9
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Car: '91 TA vert
Engine: turboLSx
Transmission: T56
Axle/Gears: 3.23
You'll also show a 42 if the EST connector is disconnected for you to set the base timing and you forget to plug it back in. 
Ask me how I know.
Ask me how I know.
04-18-2005, 08:00 PM
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Car: 88 IROC
Engine: 5.O TBI
Transmission: Auto
Error Code 42
The code 42 is intermittent and I have already replaced the pickup coil and the ICM. The EST connector is connected. The car starts to stall, comes back to life and kicks on the SES light. I only find the 42 in the ECM and not sure how to start trouble shooting. I cannot reproduce the problem at will.
04-21-2005, 10:02 AM
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Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
Re: ECM
Originally posted by Pdiminico
Swapped out my ECM and the issue seems to be resolved.
Swapped out my ECM and the issue seems to be resolved.
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