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#1 |
Senior Member
Join Date: Jul 2002
Location: Lindsay, TX
Posts: 1,245
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Check engine light, stumble, power loss
Ive got an 90 Jimmy with a 350 and I will be driving down the road just fine when all of a sudden it will kinda stumble. Immediately the power will go down and it wont be very responsive, and the check engine light immediately comes on. I havent checked the code yet, that may help.
Any ideas?
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68 Chevy 383/350 w/shift kit, 380hp/425ft-lbs, 4.5/5 drop, 17" TT2s 64 Cadillac Sedan DeVille |
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#2 |
www.73-87chevytrucks.com
![]() Join Date: Dec 1999
Location: Birmingham, AL
Posts: 6,935
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Re: Check engine light, stumble, power loss
Check the codes and tell us what they are.
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Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com |
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#3 |
Senior Member
Join Date: Jul 2002
Location: Lindsay, TX
Posts: 1,245
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Re: Check engine light, stumble, power loss
Code 42
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68 Chevy 383/350 w/shift kit, 380hp/425ft-lbs, 4.5/5 drop, 17" TT2s 64 Cadillac Sedan DeVille |
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#4 |
Registered User
Join Date: May 2004
Location: Minnesota
Posts: 4,621
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Re: Check engine light, stumble, power loss
Code 42 can be set by a bad distributor module, a bad ECM, or wiring problems between the ECM and distributor.
A code 42 will get set when the set timing connector is unplugged to set the timing. Make sure you clear the codes after setting the timing. When the problem is present that sets the code 42, the truck will be running in a backup mode without electronic spark controlled timing. It sounds like heat could be causing the distributor module to break down. Many stores like NAPA in my area will test the module for free if you bring it in. Make sure when you install or reinstall the distributor module that you use heat sink compound/grease under it. The grease helps dissipate heat from the module. |
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#5 |
Senior Member
Join Date: Jul 2002
Location: Lindsay, TX
Posts: 1,245
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Re: Check engine light, stumble, power loss
Your knowledge never ceases to amaze me ChevyTech.
I guess Ill call around tomorrow to find a place to test the module first off. Thanks
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68 Chevy 383/350 w/shift kit, 380hp/425ft-lbs, 4.5/5 drop, 17" TT2s 64 Cadillac Sedan DeVille |
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#6 |
Registered User
Join Date: Jan 2008
Location: Federal Way, WA
Posts: 53
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Re: Check engine light, stumble, power loss
My suburban just started doing the same thing last week, little different, it will stumble and run bad until shut off and restarted or stumbles and shuts off. same code 42. I guess I know what to check first now, thanks
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1970 K-10 400CID, to much cam--not enough compression ![]() ![]() ![]() "The probability of someone watching you is directly proportional to the stupidity of your actions" |
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#7 |
OL BLUU
![]() Join Date: Mar 2004
Location: WICHITA, KS.
Posts: 1,065
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Re: Check engine light, stumble, power loss
I have had this problem for A LONG time... and I did replace the distributor module. I also installed the grease... but I'm wondering if I installed enough underneath it?
Keep us posted on what you find.. Thanks, Anthony |
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