Code 42.... HELP!!!! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

adot · 11-08-2003, 09:40 PM

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.

Krosati · 11-10-2003, 10:05 PM

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.

adot · 11-11-2003, 09:59 PM

Thanks Krosati. Were can I get one of these books? Is there a web site you can direct me to?

Krosati · 11-12-2003, 12:25 AM

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)

**crossy** · 11-14-2003, 01:14 AM

thats it ? LOL

adot · 11-14-2003, 08:10 PM

Thanks Krosati. I'll give it a try.

Lee R. · 11-25-2003, 05:40 PM

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.

Lee

11-08-2003, 09:40 PM	#1
adot Registered User Join Date: Nov 2003 Location: Arizona Posts: 5	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.

11-11-2003, 09:59 PM	#3
adot Registered User Join Date: Nov 2003 Location: Arizona Posts: 5	Thanks Krosati. Were can I get one of these books? Is there a web site you can direct me to? __________________ 1990 GMC SUBURBAN MSD 6A MSD DIST. HELIX TBI SPACER

11-14-2003, 01:14 AM	#5
crossy Oh,you can't buy that new Join Date: Apr 2000 Location: Pennsville,N.J. 08070, USA Posts: 2,039	thats it ? LOL __________________ "been there, done that, ruined the T-shirt". 2007 LBZ GMC Sierra, ECSB 2006 LM7 RCSB Silverado 98 Vortec project. 94,3500,6.5L 4L80 81 SWB GMC POS finally gone 73 Pinto, stock, w/CragarSS's-eww LOTS of Cummins trucks.

11-14-2003, 08:10 PM	#6
adot Registered User Join Date: Nov 2003 Location: Arizona Posts: 5	Thanks Krosati. I'll give it a try. __________________ 1990 GMC SUBURBAN MSD 6A MSD DIST. HELIX TBI SPACER

11-10-2003, 10:05 PM	#2
Krosati Registered User Join Date: Jul 2003 Location: Texas Posts: 49	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.

11-12-2003, 12:25 AM	#4
Krosati Registered User Join Date: Jul 2003 Location: Texas Posts: 49	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)

11-25-2003, 05:40 PM	#7
Lee R. Registered User Join Date: Aug 2003 Location: long island, NY Posts: 26	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. Lee



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