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Old 01-21-2004, 08:57 AM
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Engine wont shut off, really wierd

Hey fellas,
I have a 87 Caprice, carburated with an 350 (L98) engine. I'm having problems shutting it down. I put it in park and it wont shut off, I have to shut it off in drive. I tried cleaning the carb and putting dry gas in the tank since its cold here in NJ. Do you guys have any other suggestions? Oh, I recently got the trans over-hauled, maybe that can play as a factor.

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Old 01-21-2004, 09:13 AM
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is it that you cant turn the key to the off position when its in park?
or when you turn it off it keeps running, could have something to do with some wiring, maybe in your running circuit.
sounds pretty weird but im shure someone knows whats going on
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Old 01-21-2004, 09:27 AM
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What you have is called "run on" from detonation, the cylinders are so hot that it`s causing pre ignition and therefore the engine keeps running but sounds like a diesel. the 80`s line of GM cars had this problem, what I do usually to solve the problem is decarbonize the cylinders, the carbon build up is what`s likely causing it, go to your nearest car quest and get a can of sea foam, remove the air cleaner, with the engine at idle, pour a small but steady stream into the carbs throat, rev the engine with your free hand, occasionally give it a high rev. or you can pour it in the gas tank, and take a few wide open throttle blasts, or you can remove all the spark plugs pour some in each cylinder and let it sit over night, whatever way you do so, afterwards check the spark timing, you may find you can advance the timing some and slow down the idle speed at the carb, this may also help.
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Old 01-21-2004, 02:33 PM
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It has nothing to do wth your transmission ...too much carbon build up on your pistons and valves mixed with the heat of a warm engine causs it to keep on runiin after the key is off(it keeps buning the carbon)
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Old 01-21-2004, 02:55 PM
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Re: Engine wont shut off, really wierd

Quote:
Originally posted by ataririder

I put it in park and it wont shut off, I have to shut it off in drive. Oh, I recently got the trans over-hauled, maybe that can play as a factor.
Here's the important part... I am guessing it is an adjustment problem, if it is shutting off like you said... although what they are saying is a good idea to do too... only costs a couple of bucks... imo: there might be an adjustment prob it if shuts off in drive/gear-
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Old 01-21-2004, 03:05 PM
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If it has a idle stop solenoid, or dashpot, check the adjustment or operation, the solenoid may be holding the throttle open.
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Old 01-21-2004, 03:09 PM
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Timing is another factor that could cause run-on with older vehicles. Sometimes the motor will actually start running backwards for a bit.
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Old 01-21-2004, 03:16 PM
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He'res two possible solutions. One is your idle turned up to much? If it is that would explain why it shuts off only gear because idle in gear is lower than idle in park. If so there is an idle screw on the drivers side of the carb(assuming you have a Quadrajet) Turn that back 1 turn see if it helps. Two if you bought cheap gas, my mothers 85 Caprice runs great, but has to run middle grade gas if she puts in the cheap stuff she will have the same problem your having. Hope this helps.

Mike
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Old 01-22-2004, 11:27 PM
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Sounds like run on(dieseling). Retard your timing. The reason it shuts off in drive is because the load of the tranny in gear helps kill the engine. Where as in park there is no gear in drive. I have to do this with my car every once in awhile on hot summer days.
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Old 01-23-2004, 09:17 AM
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How does having too much timing make it run on? When you turn off the key, you kill power to the distributor and timing is no longer in the picture.

Its possible that by moving the timing back some, you will lower the base idle rpm and the rpm change will help it shut off.
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Old 01-26-2004, 11:40 PM
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Thanks felllas,
I put in 89 octane and some Sea Foam in the carb. The car runs normal again. I didn't have to change the timing. Sorry for the late reply, my computer got ill.
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Old 01-27-2004, 12:59 AM
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Is dieseling only a problem in point type distributors? Cuz it seems like in an HEI once you turn the key off the power is cut to the module.
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Old 01-27-2004, 09:57 AM
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the answers are correct it is advanced to much and the carbon on the pistons is red hot and causeing the fuel to keep burning another way to stop it is to get a pepsi bottle and fill it with water and pour it slowly in the carb while reving it up don't stall the engin it will clean the top of the pistons
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Old 01-27-2004, 12:10 PM
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Oh ok.. I understand now.. The red hot carbon is burning the gas.. Not the spark plugs.. Gotcha
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