Dieseling problem - Team Camaro Tech
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post #1 of 4 (permalink) Old May 7th, 03, 04:07 PM Thread Starter
Join Date: May 2003
Location: Nevada
Posts: 1

I just traded my Bronco to my brother for his 85 Camaro with a 305 and electronic Q-Jet. When ever the engine is warm it diesels when I shut it off. The only way I can shut it off is to put it in drive and then shut the key off. How can I fix this short of buying a new carb?
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post #2 of 4 (permalink) Old May 7th, 03, 05:44 PM
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Join Date: Nov 2002
Location: Aiea, Hawaii
Posts: 571

1. Keeps on ticking due to fouled spark plugs or cylinder area not allowing shut down due to hot carbon still able to ignite the gas fumes.
2. Carb set rich or leaking... a little keeping too much gas available to ignite.
3. Never seen this but the alternator might be shorting into the distributor wiring leaving a little power to keep a spark going. Not that I'm about to work on my car's ignition and other wiring and day dreaming about how I could screw up.
You'll always feel like your starting fresh with new plugs so maybe if they are dirty start there.
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post #3 of 4 (permalink) Old May 7th, 03, 08:04 PM
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Join Date: May 2002
Location: Ft. Worth, TX . USA
Posts: 59

Don't buy a carb unless you know 100% that it is the problem. You, in my opinion, are more likely to have an electrical problem. Possibly the diodes in the altenator are bad and allowing a slight current to flow to the ignition for a second or so after the key has been shut off. You may have some other electrical leak that is allowing the ignition to keep firing as well. Check this out with a test light. Find an ignition wire hooked to your distributor that is hot when the car is running and cold when it is off. When you have located that wire you simply need to start the car, attach the test light and then shut the car off. You will problably find that the test light stays on while the car diesels and then the light goes out when it finally stops. That my friend will let you know that your problem is electrical, not a carb.

Randy<br /><br />My dream car is never quite finished....<br />I keep running out of money!!
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post #4 of 4 (permalink) Old May 8th, 03, 05:30 AM
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Join Date: Apr 1999
Location: Fortuna, CA
Posts: 26,529

David - This is most likely caused by the throttle blades being opened a little too much. Sometimes you can turn the idle screw down closing the throttle blades some and then adjust the rich/lean mixture screws to bring the idle back to the desired rpm.

My '86 El Camino (305, electronic Q-Jet) does this from time to time also. It has a solenoid that kicks the idle up to keep it from stalling. You'll see it's plunger touching the throttle linkage on your carb. If like mine, your throttle is set ok on the carb but the solenoid is in need of adjustment. When the solenoid is operating the idle is about 1000rpm when it's not it's about 750rpm.

I'm always tinkering with the Camaros and kinda ignore the El Camino so I haven't done anything more than figure out what the problem is. I found a quick rev and then turning off the key when it settles to an idle usually keeps it from running on. I also notice that it does it more when whipping into a stall, throwing it into park and turning it off as opposed to letting it idle for about 30 seconds after putting it in park... The computers on these 80's cars are not the best!!!


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