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90 Chevy Silverado Code 42
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Jhenriksen
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Dec 26, 2011, 1:11 PM
Post #1 of 14
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90 Chevy Silverado Code 42
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I have a 90 Chevy Silverado, 5.7 Truck 110000 miles, running sluggish, has a
code 42. With vehicle running I unplugged the EST wire and it almost
died so i would say its getting a good connection between the
distributor and the ECM. I replaced the module in the distributor, still
runs the same. Not sure where to go from here.
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 26, 2011, 1:14 PM
Post #2 of 14
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Re: 90 Chevy Silverado Code 42
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If it has a knock sensor, try unplugging that.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Jhenriksen
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Dec 26, 2011, 3:57 PM
Post #3 of 14
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Re: 90 Chevy Silverado Code 42
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Yes it has one. What should happen when I unplug it.
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Hammer Time
Ultimate Carjunky
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Dec 26, 2011, 4:02 PM
Post #4 of 14
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Re: 90 Chevy Silverado Code 42
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See if it runs any better.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Jhenriksen
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Dec 31, 2011, 11:46 AM
Post #5 of 14
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Re: 90 Chevy Silverado Code 42
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Runs the same with it unplugged.
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Discretesignals
Ultimate Carjunky
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Dec 31, 2011, 11:51 AM
Post #6 of 14
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Re: 90 Chevy Silverado Code 42
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Clear that code by disconnecting the battery for 10 secs. See if the code comes back. If it comes back let us know. That code can set if you open the bypass circuit to set your ignition timing.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 31, 2011, 11:56 AM)
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Hammer Time
Ultimate Carjunky
/ Moderator
Dec 31, 2011, 11:52 AM
Post #7 of 14
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Re: 90 Chevy Silverado Code 42
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OK, it's not the sensor causing the problem. It's going to take some in depth testing to check all the wiring and ECM.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Jhenriksen
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Dec 31, 2011, 11:57 AM
Post #8 of 14
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Re: 90 Chevy Silverado Code 42
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Thanks, I have some one sending me a wire diagram and a trouble tree. I guess I know what I'm doing today. I'll let ya know what I find. Thanks Again.
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Discretesignals
Ultimate Carjunky
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Dec 31, 2011, 12:01 PM
Post #9 of 14
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Re: 90 Chevy Silverado Code 42
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HT, I think that your getting 43 and 42 switched. 42 has to do with the ESC bypass circuit being open or shorted.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Discretesignals
Ultimate Carjunky
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Dec 31, 2011, 12:04 PM
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Re: 90 Chevy Silverado Code 42
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You might wanna make sure that you didn't set that code by playing with you ignition timing from disconnecting the bypass connector (tan/blk wire). If that code set because you disconnected the bypass at one time, your just going to take yourself on a wild goose chase.
If you clear the code and the bypass connector is plugged in and the code comes back, that's when you need to trouble shoot using your chart.
In fact, I am looking at the chart right now and clearing the code and seeing if it comes back is the first step.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Dec 31, 2011, 12:09 PM)
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Jhenriksen
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Dec 31, 2011, 4:47 PM
Post #12 of 14
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Re: 90 Chevy Silverado Code 42
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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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Discretesignals
Ultimate Carjunky
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Dec 31, 2011, 5:03 PM
Post #13 of 14
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Re: 90 Chevy Silverado Code 42
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Good eye  Happy New Year!
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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Jhenriksen
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Dec 31, 2011, 5:08 PM
Post #14 of 14
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Re: 90 Chevy Silverado Code 42
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I call it better to be lucky than good...Thanks again
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