Car went from being quiet to all of a sudden sounding like a lawn mower when it was started. Had it evaluated and it was a cracked exhaust manifold. The crack was right in the middle of the manifold. Called around for prices of repairing it and they were as high as $700. Just thought I would do a search on it and found a utube video on how to repair it yourself and was reading the comments below it. One person said the same thing happened to him and gm reimbursed him for repairs. So I got online with GM and talked to them about it and they said yes it was covered under a special warranty but it must be evaluated by GM first. If it proved to be something else I would be charged a service call if it was the manifold it would be replaced at no charge to me. Took it down to the dealer and they agreed. Have an appointment on Thursday for repairs.
My trailblazer was really loud when the engine was cold and stayed loud until it warmed up. My GM dealer said that there was a special warranty and that it will be taken care of if you have less than 120,000 miles.
Last year at 90000 miles my Trailblazer had a cracked manifold. I had it replaced. Now a year later the replacement manifold has cracked. I have an appointment with the dealer tomorrow to see what is causing this problem.
I just replace catalytic converters and during some of the internet research I stumbled across one report of converter being too close to exhaust manifold it causes problems because it makes extra heat.
Not suggesting this is the cause, just makes me wonder.
90,000 range replaced under warranty and now at 212,000
Just checked this thread and the symptoms match my 2003 4.2L. Have exhaust noise especially when cold but quiets down when warm. Have 158,000 miles on this rig so I can't really complain that the extra warranty has expired. Looking at the replacement price quotes, looks like I won't have to take out a second mortgage! Now I just need to find someone other than the local chevy dealer to fix it...
this is a great vehicle and I plan to keep it for another 5-7 years.
Same as others slightly noisy better when warm. All of a sudden sounds like a tank. Dealership said was a service bulletin work estimate 90 to 120 minutes plus parts covered by GM. My question is once they have replaced this and it fails again what do you do if a dealership guarantees their replacements. When in hits 119000 miles I think it goes down the road before this. Is my third trailblazer first one repeated radiator failures second cracked cylinder head at 22000 miles now this one. Both of brand new our Cruzes multiple recalls. Feeling like time to change brands
Check engine light was on and I could hear an exhaust leak and thought it was on the doughnut gasket. So I took it to a garage and had it checked out. I was told I had a cracked manifold and they was common on this car.
cracked exhaust manifold... went from no problem to sounding like a beat up jalopy, no cause, mechanic said the crack was minor but would continue to worsen until total engine failure, further excessive engine temperature could damage wiring... not good