Question about 2004 Chevrolet Tahoe

1 Answer

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.

Posted by on

1 Answer

  • Level 1:

    An expert who has achieved level 1.

    Mayor:

    An expert whose answer got voted for 2 times.

  • Contributor
  • 3 Answers

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

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

3 Answers

2002 Sable sedan choke/missing/sputtering intermittent


The PO 316 is still misfires om first 1000 revolutions
so the shop did a poor job for you on resolveing the
cylinder misfires

Try a diffferent shop

Have to clean the MAF Sensor & replace upstream
oxygen sensors if over 100,000 miles

Need the correct oem spark spark plugs/any brand

No reason the gas filter should be clogged unless it was in
the car for 10 years

Fuel pressure should be checked

Need to check for cylinder misfires on a road test of 20
miles or more with professional software in Mode#06

Jan 17, 2013 | 2002 Mercury Sable

1 Answer

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.

Feb 14, 2011 | 2003 Chevrolet Tahoe

2 Answers

How do i know if i need a tune up?


Usually @ 50-60,000. New air filter, Gas filter, Plugs and wires.......If car starts running rough or hard to start and miss fire is a good sign of a tune up needed..............Hope this helps.

Nov 21, 2010 | 2002 Chevrolet Malibu

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.
Gm has a up graded program to address the piston slap to help make the engine last longer. Believe it's covered under the TSB if you bring it in to have it addressed. The program simply turns the timing back on the engine when it's cold to help eliminate most of the knocking and is helpful in making the engine last longer. As the engine warms up, the program brings the timing back to where it should be to not economy and performance is lost.
Thank you for using fixya and good luck.

Jun 15, 2010 | 2002 Chevrolet Tahoe

3 Answers

2002 express 1500 van, will not start


remove dog house locate test port and install guage should be 45-60 psi

Mar 03, 2010 | 2002 Chevrolet Express

1 Answer

2002 Saturn SL1 rough, sputtering idle - cylinder #1 misfiring


spray some carb cleaner on the passeger side of the intake manifold, right behind the alternator. it is very common for those to leak there and cause those exact problems

Apr 30, 2009 | 2002 Saturn S-Series

2 Answers

2002 Tahoe Dropping Cylinder


A tune up will not cure the lean code, in fact an engine miss gives a rich code from the unburned fuel. I would suggest u verify u have no vacuum leaks, also clean the inside of the MAF sensor if so equipped and replaced the bank two O2 sensor, that is the passenger side sensor before the catalytic converter. If u have the money replace both right and left sensors, it is better to do them in pairs.

Jan 15, 2009 | 2002 Chevrolet Tahoe

Not finding what you are looking for?
2004 Chevrolet Tahoe Logo

461 people viewed this question

Ask a Question

Usually answered in minutes!

Top Chevrolet Experts

yadayada
yadayada

Level 3 Expert

60667 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

21936 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

6811 Answers

Are you a Chevrolet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...