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Olds 307 Dieseling (cycling at shutdown) and a mirror.

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4.3K views 4 replies 4 participants last post by  tqwrench  
#1 ·
Now, though I live in Florida, I am not going to use the ******* solution of poke at it with a stick and ass higher octane fuel, but when I shut my car down, the engine diesels for a bit. It seems a bit worse when the engine is warmed up from a longer drive. Now the obvious cause seems to be the knock sensor. How do I deal with this?

Another thing is my passenger side mirror seems a bit loose. Not the housing, but just the actual mirror glass. It kind of likes to flap about, if not in an exactly perfect spot, which seems to hold it place better. It's the mechanical joystick type, where the joystick is connected to a few cables and mounted beneath the stereo head unit. Anyone have any ideas on this? Naturally, this is nothing compared to the first question, but still. Considering this is my car that actually HAS two mirrors, it would be cool if they worked right.
 
#3 ·
On of the main causes of run-on, is carbon deposits in cylinder head. If you haven't done anything to clean the engine, you should run a can of Seafoam into the intake, to clean off all of the pistons.

Another cause of of run-on, is vacuum leaks, especially in the lines going to the anti-dieseling solenoid. The anti-dieseling solenoid is mounted to the driver's side valve cover, towards to front of the engine; there should be an electrical connector on top. Make sure that the hoses in that area aren't dry rotted, and then check the contacts of the connector to see if they are clean.

Also check the lines going to the passenger side, back of the carb. The carburettor has vacuum controlled brakes, which slam the throttle plate shut when the engine is turned off. If the brakes don't close the plate quick enough, air will get in and the engine will run-on for a few seconds.
 
#5 ·
The most common cause for dieseling is throttle angle is too high at shutdown. Check the ILC (idle load compensator) vacuum hose and routing. It could be extended when it should be pulled in. They usually have a delay before they take off and open the throttle again. Could be the diaphragm in the ILC failed.