Its sound like there is a whole in the muffler or somthing to do with the muffler. As it warms up the loud noise goes away and it sounds normal. Until I start it when its cold. Then its loud again.
That is the exhaust pipe gasket . it is on the front pipe going to the exhaust manifold
Testimonial: "OK. Thanks. That makes sense. I'll get it checked out. "
SOURCE: Noisy rattle in engine compartment of 2003 Impala on cold start.
Take a broom handle(with the broom removed) or long heavy dowel rod , start the engine when cold and place one end of handle to your ear and the other to different parts non-moving parts of the engine compartment,including the engine to narrow down the location of the noise.
SOURCE: Chevy Trailblazer Engine very loud when starting
it's too early to tell. i,ve never known a light to come on because of a thermostat.you need to see what code was stored. without knowing,im just guessing. but my first thought was a plugged up catalytic converter. that explains the low power,also fuel filter.
SOURCE: Lifter ticking when I start my 1999 Chevy Tahoe
Your lifters have become clogged over the years. Its only after the oil warms up and thins out does it allow oil to "pump up" the lifters. That's why it goes quiet after 5 min. There are several different brands of additives on the market that can fix this problem ,unless you have a more serious mechanical problem, which I doubt.Check your local auto parts store for the additive. Just add it to your oil and "wham!" problem solved. Good Luck!
SOURCE: CLICKING NOISE IN THE ENGINE AREA
It could be an exhaust leak
It could also be the infamous "Piston Slap" common in 1999-2002's.
GM "standardized" pistons or something like that and they did not fit the cylinders tight enough. The piston "slap" the cylinder walls and make a tapping sound for the first few minutes until the pistons expand to fit. GM would not fix it and says it does not hurt the longevity of the motor ( yeah ri--ght! ) Do a google search for piston slap.
My 02 silverado has done this since almost new... now 145,000.
SOURCE: ticking when cold
It could also be the infamous "Piston Slap" common in 1999-2002's.
GM
"standardized" pistons or something like that and they did not fit the
cylinders tight enough. The pistons "slap" the cylinder walls and make a
tapping sound for the first few minutes until the pistons expand to fit.
GM would not fix it and says it does not hurt the longevity of the
motor ( yeah ri--ght! ) Do a google search for piston slap.
Oil level would help if it is a lifter ticking but will do nothing if it is the pistons slapping the walls. My 02 silverado has been doing this since almost new and the above description is straight from GM and a few visits to the dealership while under warranty.
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