truck keeps running?

[jeff l]

after i turn it off. Its a 79 rebuilt 350 w/600 cfm eld/carb.
one person said that i have it idled to high. just wanted a 2nd opinoin
thanks

 

[obijuan]

i think its called deiseling, it could be a few things like timing and idle speed. check those.

 

[73k5blazer]

Some vehicles were equipped from the factory with what they called an "Idle stop solenoid".
You can get them at the auto parts store. If worst comes to worst, you can installl one of them. I believe holley sells a bracket just for it too.

But, yeah, check your timing, idle speed, choke setting...etc.

 

[matneyr]

I have a '85 Suburban that is notorious for dieseling. I've tried everything to make it stop, including timing, plugs, idle speed, choke -- it still does it. It's worse the closer to sea level you get.

 

[pauly383]

Weather makes a difference . But for the most part idle speed . I have a Q-jet and an auto trans , I idle at 500-550 in gear , 600-650 at idle , and once in awhile it still does it .

 

[xpndbl3]

if you want to prevent dieseling then shut it off in gear and then put it in park afterwards.

 

[jeff l]

thanks for all the replies. I feel better about what direction to go to fix the problem. also thanks for the kill it in gear tip. I will do that, till the week end when i get to work on it.

 

[Hogback Fabrication]

Carbon buildup can cause dieseling as well. Seafoam is the fix for that.

 

[ftcjimmy]

It is because theres carbon build up, the carbon gets hot spots wich ignites the compressed gasses. Also maybe you used some bad gas?

 

[matneyr]

Well, the stopping while in gear thing works -- but my truck doesen't diesel every time I turn off the engine, only occasionally.

 

[02turbogixxer]

if you want to prevent dieseling then shut it off in gear and then put it in park afterwards.

I've tried that and it doesn't always work.

 

[Hogback Fabrication]

That is a cover for a slightly bigger problem. Leaving the truck in gear (or in park) is not the solution to a dieseling problem.

 

[4x4_76]

My uncle once told that if the engine is dieseling, it can be cured by spraying water to intake. First take off the aircleaner, then use spraybottle (one that is used to spray flowers), keep rpm's between 1500-2000 and lightly spray water to carb. It sounds nasty, but works.

edit/ That is, when carbon build-up is causing dieseling.

 

[BURBicon]

I've been doing the "shut it off in drive" deal for years. I'm not even sure if my truck diesels any more.

NOTE TO SELF: Put tranny in park just to see if truck diesels next time I shut it off.

 

[SchnorrCS]

Dieseling can be caused by alot of junk. High coolant temp is one cause I've heard and not seen mentioned yet.

My truck does it if I put crappy gas in it. I hold the brake and turn it off. Don't know why, but it seems to work. Maybe it's just the thought of trying to do something that makes it seem to work...I don't know.

 

[MattK]

i used to have an 85 blazer that dieseled after shutoff when the engine was good and warm. seafoam cured this problem. it also idled A TON smoother and quieter.