The term used to express what your car is doing is dieseling. When a gasoline engine "diesels" (operates without the spark plugs getting voltage) it's because something in the combustion chambers (a spark plug tip, small piece of carbon, sharp metallic edge, etc.) is overheated and glowing red hot. Some of the potential reasons for this phenomenon is that the idle speed is too high, the fuel/air mixture is too lean (maybe caused by a vacuum leak), the spark plugs are the wrong heat range (they literally overheat), or the combustion chambers have a carbon build-up and the carbon is glowing red-hot. All of these can be rectified by a mechanic but for a start, use a higher octane gasoline to see if it helps. Additives in the gas tank can sometimes cure the problem too. The smoke from the sea foam is normal.If you really want to clean the intake of all of it's carbon build up get an intake service.The service, when performed correctly,cleans all the carbon and fuel/dirt build up off of the intake walls where fuel/air ratio mix takes place,the vavles,the throttle bore and the egr passageway, to rectify driveability issues and restore lost performance.You will be amazed at the restored performance if this service is performed correctly.Call around for the best price.That thick gummy substance that bulds up on the inside of the intake is detremental to Fuel/air mix and the Carbs ability to atomize the fuel properly .Let me know how you make out with this. This service is just good PM anyway.Should be performed at least every 60,000 miles to keep the system in tip top shape.If you are allowed to watch them perform the service you can have them hold a white shop towell at the exhaust so you can see all the black crap that is removed from the concentrated cleaning agents.
Edited by railman on February 23 2006 at 4:26pm
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