Average mileage: 112,675 (56,850–255,000)
54 people reported this problem
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.
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.
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.
Had the original one replaced then a year later the replacement cracked also.
Ticking noise coming from engine
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
Bought the Trailblazer in June 2015, few weeks ago friend noticed when I started it that it sounded too loud. Told me my exhaust manifold was cracked. Went to a mechanic and he confirmed.
I just took my truck in because it was sounding loud. I suspect it is a cracked manifold again. I had it replaced 5 years ago and now it seems to be cracked again.
I had a crack in the exhaust manifold and had to replace it.
My wife reported that her Trailblazer developed an awful sound last weak and that it was getting worse. I am a mechanic of 30+ years and quickly determined that the exhaust manifold was cracked. I have completed this repair on a similar GMC vehicle for a friend and am now becoming aware as to how common this problem is. After some research I have decided to replace the exhaust manifold with an improved aftermarket version as I feel that their design is a little thicker and the separation of the ports on the cylinder head side allows for expansion and contraction from temperature changes. I have been told that GM now does this on their replacement part, they must be aware of the problem....? According to the service writer at our local Chevrolet dealer we are not the original owners of this vehicle and no warranties seam to apply so I will just make the needed repair and move on. I find myself pondering if this could be somehow covered under emissions warranty responsibilities by the those that manufacturer the vehicle...
I had been a die hard Chevy fan for many years however the last three Chevrolet vehicles we have owned have been nothing less than a disappointment. Another noise is apparent, sounds like a belt tensioner or idler pulley is failing. Perhaps it is time to consider trading this vehicle in for something else...?
One day the car just started being really loud brought it to a local shop and was told it's the exhaust manifold
My car was quiet and running well, then started making extremely loud noises while running. Had to have the exhaust manifold repaired at a cost of $600.
Had the car about 6 months, noticed the engine was louder than usual and instantly knew it was an exhaust problem. Took it to shop, was told manifold was cracked and leaking which would be a $700 repair. I found the part for $100 and was quoted a $150 to fix from a family friend who owns a shop.
Crack is near the bottom of the exhaust manifold near the coupling for the exhaust pipe. Working with my local Chevrolet dealer to have the manifold replaced under a warranty extension.
It's not been replaced yet it's a current problem
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.
Is making laud noise were the mufler pipe comes out the motor
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
Cracked manifold which I found it to be common on trailblazers from 2002- 2009, this is my second one, I had no problems with the first on with 80,000 miles
It just got loud,then took to garage they said cracked manifold. 200.00 for labor $145.00 for part. That wasin January 2015 now today August 28gh I got to get it done again.