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06-03-2013, 04:54 PM
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#1 |
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Registered User
Join Date: Apr 2011
Location: Muskogee, Ok
Posts: 26
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1987 code 42
Hi to all,
Ive got a 1987 chevy 1/2 ton with 305 and th400. Ive got a random code 42 that is kicking my butt. So far I have put 2 ignition control modules in, both GM. And I have put a used computer in. Every time I change out something it waits a couple weeks and then sets the code 42 and I can feel the difference in the engine and the shifting of my transmission. Its random though. After 2 weeks or so of replacing a part, it will then set and randomly die and randomly run rough. Any help would be appreciated. Josh |
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06-03-2013, 10:37 PM
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#2 |
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Registered User
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
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Re: 1987 code 42
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06-04-2013, 09:24 AM
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#3 |
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Registered User
Join Date: Apr 2011
Location: Muskogee, Ok
Posts: 26
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Re: 1987 code 42
Thats the problem, it is intermittent.
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06-04-2013, 09:45 AM
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#4 |
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Registered User
Join Date: Jun 2012
Location: Meeker, ok
Posts: 146
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Re: 1987 code 42
This guy on his 91 burb fought it intermittent. It was a good read, maybe help you out.
http://www.gmtruckclub.com/forum/sho...-1991-Suburban
__________________
Trevor 74 C20...work in progress. 04 Saturn Ion...Daily Driver |
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06-04-2013, 03:08 PM
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#5 |
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Registered User
Join Date: Jul 2010
Location: Janesville, WI
Posts: 664
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Re: 1987 code 42
Not to thread Jack but it seems weird a half ton with a 305 would come with a th400 in 87
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06-04-2013, 04:05 PM
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#6 |
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Registered User
Join Date: Apr 2011
Location: Muskogee, Ok
Posts: 26
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Re: 1987 code 42
It was an Oklahoma State Park truck. I guess they only needed 3 speeds.
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06-04-2013, 04:08 PM
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#7 |
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Registered User
Join Date: Jul 2010
Location: Janesville, WI
Posts: 664
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Re: 1987 code 42
Still weird a 400 and not a th350 no offense but I'm surprised that 305 can even turn the pump on a 400
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06-04-2013, 05:35 PM
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#8 |
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buffle
Join Date: Sep 2004
Location: Independence, Mo
Posts: 426
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Re: 1987 code 42
I don`t think they had 350 turbos in 1987 , only 700r-4 and 400 turbo. My 87 with a 4.3 has a 400 turbo
__________________
Life is like a roll of toilet paper. The older it is, the faster it is used up. |
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06-04-2013, 05:49 PM
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#9 |
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Registered User
Join Date: Jul 2010
Location: Janesville, WI
Posts: 664
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Re: 1987 code 42
Huh I never thought of that. But what a combo 4.3 th400.lol
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06-04-2013, 07:14 PM
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#10 |
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Registered User
Join Date: Sep 2009
Location: Weare,NH
Posts: 1,592
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Re: 1987 code 42
Get the pinout for your ecm its likely a loose wire causing this issue.
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