My 2001 Olds Intrigue had a lot of "misses"and white smoke from the exhaust pipe. When new fuel injector put on, gas poured from exhaust pipe and stopped when that injector blocked off.
Make sure you use OEM Injectors. The white smoke might come at a 3.5 from a bad gasket bewteen the intake manifold and the throttle boy or if you have the 3.8 from bad gaskets between the intake manifold and the engine.
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The O2 Sensor see the coolant or water vapor
& then PCM adds fuel
So you got coolant & too much fuel out tailpipe
Do a Combustion Leak Test where you put a plastic
container over the radiator cap area & see if the
blue fluid turns yellow indicating exhaust in coolant
from head gasket
I am corncerned about the smoke being white.
White smoke usually is from moisture in your exhaust system.
The moisture comes from water getting your engine cylinders by one of several ways.
1 Blown Head Gasket
2 Cracked Head
3 Cracked Cylinder
A rich gas condition causes black smoke
Oil burning causes blue smoke
Check your coolant level to make sure your not losing it into the engine vis a crack or bad gasket.
a few things you can do is replace the fuel filter, air filter, and do a thorough injection cleaning. you can do this simply by buying a can of sea foam from any auto store and turn the car on and pull out a brake booster hose. this is located under the hood in the top right. it should be black, big and circle. also two hoses should come out of it. slowly pour the seafoam in. try your best to keep it running. once it starts bogging down, stop for a second then keep adding. do about a half a can and pour the other half in your fuel tank. turn the car off for about 5-10 minutes and then start it. lots of smoke will come from your tailpipe, but thats okay because that is all that carbon build up. and you should notice more gas mileage!
these cars have what they call dis system. connected to the computer is an e.s.t. sensor, this controls the injectors an spark going to the plugs. the e.s.t reads a magnetic signal from the camshaft. A bad e.s.t. sensor can cause tons of problems. they are a lot cheaper to replace than injectors.
Have you checked the spark plugs and wires? It could be you have one or more cylinders that are not firing and so the unburned fuel has to go somewhere (out the exhaust).
it could mean a bad oxygen sensor or intake gaskets and here is place that maybe of help also: Schram auto and truck parts 1-800-292-1032 they sell only GM parts
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