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I have a 92 chevy. 4.3 TBI . that is getting alot of gas in the oil. It wont start. It trys but doesn't. I am getting alot of gas in the oil. I thought fuel pressure regulator or injectors. I changed out the whole throttle body with injectors. Still gas in the oil. Things I have done...1 compression check around 120 per cylinder. 2 Ran a jumper wire on my obd1 and the only fault code is 33 ( map sensor ). but i tested the voltage on the map sensor and it seemed to work ok ( i had a voltage change when vacuum applied to sensor. Any ideas anyone ??
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Well, I read your post went to the truck and pulled the number plug on number 1. it is getting fire but not a real good spark. I even swaped out the spark plug with a new one...looked them same. I held the end of the plug to the engine to ground it. not very good spark with the old or new plug. I could hold the whole plug away from the engine about an inch and it would jump spark that far. ???
Last edited by 3sixty; 11-26-2011 at 12:13 AM.
Arc across an inch of air doesn't really prove anything. The spark across the spark plug gap should be bluish bright (shows a high energy discharge) to do any good. You'll probably want to bring out your multimeter and check your ignition components.
How many ignition components are there ? I was looking at this website Part 1 -Ignition Control Module (ICM) Test: GM 4.3L, 5.0L, 5.7L. is this how I should check it ?? This says 95 and older this truck is a 92 are the components the same ? I believe you are correct the spark I am getting is not enough to ignite the gas and the fuel is just going down the cylinder wall to the oil pan. I hope this is what it is....I have my fingers crossed