Question about 2004 Chevrolet Tahoe

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Engine has a miss at idle exspecially in the morning

Have a 2002 tahoe with 84000 miles last year i noticed a rough idle in the morning when i started it the sevice engine soon light would flash but when started driving it went out and the truck would be running better but still had a hesitation at idle or sitting still.i changed plugs and wires and gapped plugs at the right specs.nothing worked.then i put a maf sensor on and thought it fixed it but the weather had just got warm and besides the little miss it was running better untill it just starting getting cold again now it started again finally i had the engine light stay on and got a code 0174 i put spark plug gappers on the oxygen sensors and cleared the code nothing again.just today i changed the plugs again and gapped them at the called for specs,there was a wet reddish yellow tinted substance on the first 2 plugs on the drivers side. once again still have the faint miss sounds like it could stall but dont. it seems 2 run a little smoother but the miss is still there. any suggestions would very much be appreciated. im out o f ideas only thing else i can think of is the intake plenum gaskets.

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Need to pull plugs and crank over in morning and see if water blows out of any plug holes. Sounds like water in cyclender.

Posted on Dec 22, 2008

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Cannot get the back left plug out due to small space. repleaced all plugs and wires except back left and front right. Now the check engine light is on and idles a little rough.

Would it give you any more room if you removed the front wheels and worked through the wheel well? You would need an extra long extension to go on your ratchet. The check engine light is probably caused by the rough idle. If you had trouble getting the plug wires off due to the cramped space, you may not have gotten them back on good, which would cause a miss and a rough idle. I have noticed that many times, when I install a new set of spark plugs, the engine will tend to have a slight miss at idle. This usually happens to engines that have not been tuned up in years. I always attributed it to combustion chamber deposits being burned of by the more complete combustion of the air/fuel mixture from the new plugs. It usually goes away after a couple hundred miles of driving, especially at highway speeds. One thing I like to do to an engine that has high mileage is run a can of Marvel Mystery Oil through the intake at very high idle. You would have to use a small vacuum hose inserted into the can and hook it up to a vacuum source so the engine can pull the oil in through the hose. It it was a carbureted engine, you would just pour it slowly into the carb. If you do this, ve sure the vehicle is outside with plenty of ventilation. Once the Marvel Oil starts burning in the combustion chambers, there will be lots of white smoke pouring from the exhaust pipe. This is normal, and it will clear up once the oil is no longer being fed to the engine. The Marvel Oil will clean all the deposits off the combustion chambers and also the top of the pistons.

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1 Answer

I have a knocking noise in my 2002 chev tahoe when I crank it up in the mornings,the colder it is the louder the knock.After about 30 sec. it stops and you don't hear it anymore.what's wrong?

It's called piston slap, what happens is that when the engine start to get a few more miles in it's life. The clearance between the piston and cylinder walls are greater then when the piston are warmed up and has expanded.
You can add Lucas oil treatment to you engine oil to put a film of oil along the cylinder walls, so when you start the engine there is a coating of oil there that will help your engine to last longer. Just follow the instructions and try not to drive the Tahoe until the engine has warmed up a bit, the winter will be more noticeable and will take longer for the piston slap to go away.
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Thank you for using fixya and good luck.

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