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73-87 Chevy _ GMC Trucks => Electrical => Topic started by: aaronwilliams on February 25, 2012, 10:44:42 am

Title: Check engine light on a 4bbl
Post by: aaronwilliams on February 25, 2012, 10:44:42 am: So the truck in question is a 1988 V30 C&C 454 4bbl(W VIN) with an intermittent check engine light. Ive scoured the internet and autoparts store racks but its like these trucks fell through the cracks.

Meaning after 87 all the wiring diagrams are for ECM based TBI systems and the diagrams from 1986 seem to more closely represent this truck.

The check engine light will go on for a little while after hard towing and then after a few hours of easier driving it goes off.

I don't think it has an ALDL connector to test. Is this correct. If so what does the check engine light mean for a carbureted 454(Rochester QuadraJet).

Ive also looked at the GM Heritage website for info and after 1987 all the paperwork is for the GMT400.

I know only the 1tons retained conventional cabs but is this a rare truck being that its a 1988 4bbl ? (I also have a 1987 V30 dually with a TBI 454 and an ALDL)
Title: Re: Check engine light on a 4bbl
Post by: VileZambonie on February 25, 2012, 11:05:51 am: Correct,

There is no ALDL on your truck. I will scan the diagnostics out of the factory service manual for you.
Title: Re: Check engine light on a 4bbl
Post by: VileZambonie on February 25, 2012, 11:27:44 am: Here ya go

(http://i6.photobucket.com/albums/y228/Sabaka454/1-4.jpg)

(http://i6.photobucket.com/albums/y228/Sabaka454/2-4.jpg)

(http://i6.photobucket.com/albums/y228/Sabaka454/3-4.jpg)

(http://i6.photobucket.com/albums/y228/Sabaka454/4-3.jpg)

(http://i6.photobucket.com/albums/y228/Sabaka454/45.jpg)

(http://i6.photobucket.com/albums/y228/Sabaka454/5-3.jpg)

(http://i6.photobucket.com/albums/y228/Sabaka454/55.jpg)
Title: Re: Check engine light on a 4bbl
Post by: VileZambonie on February 25, 2012, 11:32:32 am: Last page got kind of cut off there. Try again:

(http://i6.photobucket.com/albums/y228/Sabaka454/6-2.jpg)
Title: Re: Check engine light on a 4bbl
Post by: aaronwilliams on February 25, 2012, 01:29:50 pm: awesome! thanks I'm gonna print those scans and troubleshoot. much appreciated
Title: Re: Check engine light on a 4bbl
Post by: DnStClr on March 18, 2014, 01:19:30 pm: Hopefully, you can report on your progress, Aaronwilliams. Others can benefit from what you find.
Title: Re: Check engine light on a 4bbl
Post by: hatzie on January 12, 2016, 03:48:27 pm: Quote from: aaronwilliams on February 25, 2012, 10:44:42 am
So the truck in question is a 1988 V30 C&C 454 4bbl(W VIN) with an intermittent check engine light. Ive scoured the internet and autoparts store racks but its like these trucks fell through the cracks.

Meaning after 87 all the wiring diagrams are for ECM based TBI systems and the diagrams from 1986 seem to more closely represent this truck.

The check engine light will go on for a little while after hard towing and then after a few hours of easier driving it goes off.

I don't think it has an ALDL connector to test. Is this correct. If so what does the check engine light mean for a carbureted 454(Rochester QuadraJet).

Ive also looked at the GM Heritage website for info and after 1987 all the paperwork is for the GMT400.

I know only the 1tons retained conventional cabs but is this a rare truck being that its a 1988 4bbl ? (I also have a 1987 V30 dually with a TBI 454 and an ALDL)
The wiring, service, unit repair, and emissions & driveability manuals for the 87-91 RV trucks are in the tech section. Hope these help.
http://forum.73-87chevytrucks.com/smforum/index.php?topic=30115.0 (http://forum.73-87chevytrucks.com/smforum/index.php?topic=30115.0)

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Title: Re: Check engine light on a 4bbl
Post by: VileZambonie on January 18, 2016, 09:02:49 am: This post was like 4 years ago and I don't think he's been back since then.
Title: Re: Check engine light on a 4bbl
Post by: Stewart G Griffin on November 25, 2016, 07:51:57 am: i think it's fascinating how you could get a crew cab or 1-ton regular cab all the way up to 91?