The truck starts no problem first thing in the morning.. I drive it for 30 mins.. turn it off and try to start it again. It'll hesitate. Mind you I've changed spark plugs wires and coil pack.. passenger side plugs are whitish gray and the drivers sides plugs were dark and blackish. Smells like too much fuel is being forced to burn off. And I'm going through gas like nothing... sluggish through all the gears even at 40 mph in 5th gear still jumps around and acts like there's not enough of something or too much of something.. sometimes purplish smoke or close to an oil burn color then goes away after a while. What could this be?
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Hello,
It does not sound as if your 4.0L V6 has a timing problem. The driver's side spark plugs being dark and blackish could be evidence of excessive fuel or excessive oil consumption. But, it's hard to say. If it smells like fuel, it could be that you aren't getting enough air -- like with an air intake restriction -- check the air filter and ensure the idle control valve is functioning properly. Or, it could be that you are getting too much fuel in one or both banks of cylinders, as with a fuel injector issue or emissions components affecting fuel control like exhaust gas oxygen sensor performance issues. Continue to test the fuel and air control areas.
