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Dirty Water
05-07-2006, 02:26 PM
I have a 87' 3/4 ton chevy with a smallblack on it. Completely stock engine. Lately its developed a bad dieseling problem. I cannot shut it off until its completely warm, or it just pops and backfires.

I'm thinking the cold start system, or the choke on the carb, but I thought I'd ask if anyone else had any idea's?

Dirty Water
05-07-2006, 04:07 PM
Heh, smallblock...stupid 10 minute edit rule :laugh:

lawnmaniac883
05-07-2006, 05:01 PM
Try premium fuel...

xcopterdoc
05-07-2006, 05:35 PM
Check the choke or if it has TBI, check for a leaky injector. Check all the basics also, timimg, plugs ect. It could be a lot of things, to include clogged EGR passages, carbon build up on valves/pistons ect.

Dirty Water
05-07-2006, 05:54 PM
I just pulled the air cleaner assembly off the carb and the idle stop(?) solinoid has a broken connection to the wire, its all melted, obviously it had been arcing.

I believe this solinoid closes the butterflies when the key is off? If so, I should be able to test this by manually closing the butterflies and having someone turn the key off?

sheshovel
05-07-2006, 05:59 PM
Yes Dirty you should be able to test it in the manner you describe.

Dirty Water
05-07-2006, 07:29 PM
I've got a new idle stop solinoid ordered, and I lowered the fast idle down a good bit (it was really racing).

With the fast idle down, the truck shuts off just fine. I will replace the solinoid though.