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2002 impala and engine clicking

Join Date: Mar 2007
Posts: 1

March 21st, 2007, 12:41 AM   #1  
2002 impala and engine clicking

I have a 2002 Impala with 3.4. Car has 44K miles. When I start car engine makes a clicking/tapping noise, which gets faster/louder when I drive. Problem goes away after about 4 minutes, when engine warm. Anyone experience this? Possible solutions? Thanks.

engine2's Avatar
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Join Date: Dec 2006
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March 21st, 2007, 11:36 AM   #2  
RE: 2002 impala and engine clicking

sounds like an exhaust leak

rbarrios's Avatar
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Join Date: Feb 2007
Posts: 339

March 21st, 2007, 3:45 PM   #3  
RE: 2002 impala and engine clicking

like mentioned. could be exhaust leak. more apparent under acceleration.
But since you say it goes away away after about 4 minutes- could be cold carbon knock. I doubt its the piston slap like the V8's had a few yrs ago in the subs and tahoes.
Cold carbon knock is also seen on the I-6 engines used on the trailblazers and similar SUVs.
A tempory fix on the I-6 is to run a bottle of Chevron techron. this helps get rid of the carbon buildup. It does quiet it down for a few months.
It eventually returns after some time on the I6. Using high quality gas helps avoid this.
If you havent- run a bottle of techron.
How about your oil? is it up to level?

Join Date: Jan 2007
Posts: 70

March 22nd, 2007, 1:50 AM   #4  
RE: 2002 impala and engine clicking

Ihad theclicking on myImpala too (also a3.4)but mine was from the sluge build up from the lower intake leaking coolant into the crank case. afterI fixed the gasketI used a high detergent diesel engine oil and it cleared all the build up out,I only ran it with that oil for about 1500 miles and it's never had aclick again. 130,000 miles and still going (here is a hint... if you have a bunch of gooey stuff, like a tan slime on the inside of your oil fill cap, your lower intake gasket is leaking coolant into your crank case) this worked for me!!

Join Date: Oct 2005
Posts: 2
United States

April 18th, 2007, 7:24 AM   #5  
RE: 2002 impala and engine clicking

it could be that there is a leak on your chevrolet exhaust system. where the manifold hits the block? Gets tighter when the engine warms? You may also benefit from checking your oil level now and adding a bit to fill.

Join Date: Sep 2006
Posts: 48

April 19th, 2007, 5:09 AM   #6  
RE: 2002 impala and engine clicking

Sounds like hydraulic lifters tapping until the oil pressure builds up.

HLF DZN's Avatar
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January 23rd, 2008, 10:23 AM   #7  
RE: 2002 impala and engine clicking

I'm no mechanic, but I bet it's related to the collant mixed into the oil as stated by Twizzle12 (above). I have an 03 Impalla with the 3.4. I heard the clicking one day, and igored it. Then a week later I couldn't get the car to heat. Turns out I need a new intake gasket. Other research points to the mixing of oil and coolant when the gasket leaks. Good luck!

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