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Author Topic:   It won't die!
ryan
Dirt Freak

Total posts: 430
posted May 21, 2002 11:42 AM
After I turn my motor off it tries to keep running and chugs for a little while. It didn't do it last year and we are using pretty much the same type of setup. What causes that. Thanks

racer17j
Dirt Forum Champ
Total posts: 1565
posted May 21, 2002 01:27 PM UIN: 54865418
check your timing it sounds like a "diesle" condition

ryan
Dirt Freak

Total posts: 430
posted May 21, 2002 01:49 PM
Timing is good. Set at the same as last year

WesternAuto17
Dirt Freak

Total posts: 248
posted May 21, 2002 01:59 PM
If its an automatic w/a converter, you can shut it off in gear and that should stop it, but it shouldn't do that.

Could it be a vacuum leak?

49mtmod
Dirt Full Roller

Total posts: 56
posted May 21, 2002 02:06 PM
I had this happen once and it was the caused by the octane boost I was running. Don't ask me why or how. Another racer saw which boost I was running and told me that it would cause a dieseling effect. Stopped using it and the dieseling quit. ???????


jammin
Dirt Administrator

Total posts: 5556
posted May 21, 2002 03:24 PM UIN: 16262997
I bet your harmonic balancer has slipped the ring. Your timing may show to be correct. What is it set at on full advance?

jammin

ford5
Dirt Freak

Total posts: 298
posted May 21, 2002 05:52 PM
your idle speed is too high

ryan
Dirt Freak

Total posts: 430
posted May 22, 2002 12:32 AM
Harmonic Balancer is brand new. I have it marked I will make sure to double check. I beleive it did the "diesel" effect before I raced it. Timing was set a 36 and is now at 38 degrees and it didn't make a difference. Thanks for all your help so far guys keep it coming.

ryan
Dirt Freak

Total posts: 430
posted May 22, 2002 12:34 AM
Idle is around 11-1200 rpms

birdcage
Dirt Full Roller

Total posts: 57
posted May 22, 2002 03:32 AM
it's not timing! when you turn off the ignition switch the ignition turns off so timing will not make the engine diesel-on. as ford 5 said the idle is to high or has a vacumn leak.

ryan
Dirt Freak

Total posts: 430
posted May 22, 2002 01:08 PM
How do I find out if its a vacuum leak. I think I read somewhere about spraying ether around the intake and carb and see if the idle changes. Is that right?

340duster
Dirt Full Roller

Total posts: 70
posted May 22, 2002 01:29 PM
WD40 works too. Or (with engine idling) cover carb inlet with rag to shut arflow off. If the engine picks up speed and runs good for a second or two you have a leak. If it dies immediately, no leak.

NWModracer
Dirt Full Roller

Total posts: 51
posted May 22, 2002 11:36 PM
Use WD40 when spraying around the intake looking for vacuum leaks, ether is too dangerous. Internal leaks are harder to find, I'd go ahead and pull the intake and replacing the gaskets and silicon.

ryan
Dirt Freak

Total posts: 430
posted May 22, 2002 11:47 PM
I am going to change my heads tommorrow or the next day so I'll have to change my gaskets anyways. Thanks for all your replies guys. Ill let you know Sunday if its cured.

bbracer17
Dirt Freak

Total posts: 256
posted May 25, 2002 03:44 PM
ryan on stock carbureted vehicles this is usually caused by the throttle blades being open to far. The best thing to do is connect a vacuum gauge, close the throttle blades and adjust the idle mixture screws untill the best vacuum is acheived. Each time you lower the idle turn out on the idle mixture screws. Run the lowest idle that you can run without the car dying

awkwardjeff
Dirt Freak

Total posts: 458
posted May 26, 2002 02:01 AM
never, never, ever.....I REPEAT.....NEVER use ether on a racing engine....with the extra compression and the timing it's too explosive and will fire causing the engine to stop......YES IT WILL DIE......IT STOPS SO SUDDENLY THAT IT CAN AND WILL BEND RODS.

Use water and listen for a change in rpm's or wd-40.......NEVER ETHER.

I had the same problem once......it was caused by the intake gaskets leaking inside the valley.......the motor was pulling air/oil from the inside the motor. This engine stayed running after shutting off the switch, it ran for 15-20 seconds.....that's when I decided to put it in 4th gear and let the clutch out........it was a bunch of compression.

replace you intake gaskets even if you don't find a leak with water or wd-40

Jeff

ryan
Dirt Freak

Total posts: 430
posted May 27, 2002 10:41 AM
Well got the heads changed and new gaskets all around and it still does it. I think I'll have to look into the carb.

ryan
Dirt Freak

Total posts: 430
posted June 14, 2002 02:06 AM
Dad redid the carb and I don't think it has done it since. thanks all

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