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Old 11-08-2003, 09:40 PM   #1
adot
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Code 42.... HELP!!!!

Code 42 has got me going crazy! Let me fill you guys in on whats been going on with my "90 burb". While warming up the burb one day I heard the engine start to lope, so I check it out and the check engine light came on. So I get my little tool and code 42 is what I get. I check my book and it says I have an electric spark timing problem. So I check for shorted or grounded timing wire, but all looks good. I do checks on ignition module, and the pick up coil, every thing still checks out ok. So I clear the codes, and drive the burb for a couple days. Then once again while warming up, it does it again. I've noticed a loss in performance, and my gas mileage has gone down. Hope some one out there can help me out.
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Old 11-10-2003, 10:05 PM   #2
Krosati
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I was having similar problems with my Sub. I can tell you it won't be easy finding the culprit.
My suggestion is to get a copy of the emissions manual for your year from GM. It really helped me.
It turned out my cracked exhaust was causing the knock sensor to kick in and retarding my timing. This ran the engine really rough because my base timing was already off by about 15 degrees.
When I get a chance, I can try to help you by looking in my 88 book.
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Old 11-11-2003, 09:59 PM   #3
adot
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Thanks Krosati. Were can I get one of these books? Is there a web site you can direct me to?
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1990 GMC SUBURBAN MSD 6A MSD DIST. HELIX TBI SPACER
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Old 11-12-2003, 12:25 AM   #4
Krosati
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Try this page. there are several manuals resources available to search from. http://members.aol.com/carleyware/books/books.html


Abbe's Automotive Manuals (used older manuals)
Alibris Used Book Search
Autodata Publications (for Asian & European makes)
Autoliterature.com (aftermarket books & manuals)
Autorepairmanuals.com
Baum Tools (manuals for European makes)
Bentley Publishing (car books & DIY manuals)
Bob Johnson's Auto Literature (new, used & reproduction manuals)
Books4Cars.com (new & used automotive book dealer)
Brough's Books (aftermarket books & manuals)
CARMANUALS.COM (reproduction shop manuals & owners manuals for classic vehicles)
Chek-Chart Publications (aftermarket service manuals & training books)
Classic Auto Manuals on CD (1972 & earlier - $49 ea.)
Delmar Publishing (automotive textbooks)
Factory Automanuals (used shop manuals)
Faxon Auto Literature, Corona, CA 1-800-458-2734 (no website - but a good source anyway)
FactoryShopManuals.com
Glenco/McGraw Hill Publishing (automotive textbooks)
Goodheart-Willcox Publishing (automotive textbooks)
Helm Inc. (supplier of GM & Ford OEM manuals)
Haynes Publications (DIY repair manuals)
Jendham Publishing (Training manuals & tech reference books)
John Wiebe Used Shop Manuals (1989 & earlier)
Mitchell International (aftermarket manuals)
Motor Publications (aftermarket service manuals)
Parts Avenue Automotive Book
Prentice Hall Publishing (automotive textbooks)
Russels Automotive Literature (used manuals & literature)
Vintage Books (used manuals & books)
Vogels Automotive Shop Manuals (used OEM manuals 1920 - 1999)
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Old 11-14-2003, 01:14 AM   #5
crossy
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thats it ? LOL
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LOTS of Cummins trucks.
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Old 11-14-2003, 08:10 PM   #6
adot
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Thanks Krosati. I'll give it a try.
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Old 11-25-2003, 05:40 PM   #7
Lee R.
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A great book about Chevrolet fuel injection is "How To Repair & Modify Chevrolet Fuel Injection" by Ben Watson. It has really good info on all the trouble codes and steps to follow to find the problem. Adot: If you want I can post or e mail the trouble shooting info for code 42 for you.

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