Manifold/header/muffler/tail Pipe Problems of Chevrolet Colorado

The contact owns a 2012 Chevrolet Colorado. The contact stated that an abnormal whistling noise was heard and grew worse over the past months. The vehicle was taken to an independent mechanic where it was diagnosed that the exhaust manifold had a crack down the middle and needed to be replaced. The vehicle was not repaired. The dealer was not contacted. The manufacturer was notified. The approximate failure mileage was 118,000.

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The contact owns a 2005 Chevrolet Colorado. The vehicle failed to accelerate and stalled when the accelerator pedal was depressed. In addition, the check engine light illuminated. The vehicle was able to restart. The dealer diagnosed that the intake manifold valve needed to be replaced. The vehicle had not been repaired. The manufacturer was notified of the failure. The approximate failure mileage was 67,000.

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The contact owns a 2012 Chevrolet Colorado. While driving approximately 5 mph the contact heard a popping sound coming from the exhaust system. The vehicle was taken to the dealer for diagnostics. The technician advised that the muffler would have to be replaced. The muffler was replaced but the failure continued. The vehicle was not repaired. The VIN was not available. The approximate failure mileage was 2,500.

I own a 2005 chevy Colorado. It has only 86,000 miles and the head and intake valves and cylinders need to be replaced. I did some research and many people are complaining of the same thing from 2004-2005 models. The total cost for me to fix this is 1,600. Gm knows they messed up with the 2004-2005 inlive 5 engines, that why in 2006 they had different intake valves installed. My dealer said that gm told them to fix the valves and seals and springs, but that is not helping the status. So then they were told to replace the head which cost around $800. Could some one please help me with this? I don't see how a company can noticed they did something wrong but not help to fix the problem. I have also heard several stories that the intake manifold cracks on some trucks, who has ever heard of that? I asked 2 people who have worked on cars for over 30 years, they have never heard of that happening. Please advise. . . . . . . . . . .

The contact owns a 2004 Chevrolet Colorado. The contact stated that the catalytic converter weld became fractured and separated. The failure recurred on multiple occasions. The vehicle was taken to the dealer where the technician diagnosed the exhaust manifold and catalytic converter needed to be replaced. The vehicle was repaired. The manufacturer was made aware of the failure. The failure mileage was 102,000 and the current mileage was 182,000.

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Check engine service light repeatedly was occurring; it was fixed by replacing sensors. Third time check engine service appears again this time the factory"heads" in the motor had to be replaced. It always seems to be some ongoing type of default or defect with this vehicle.

Exhaust manifold completely cracked. At the cylinder closet to the firewall, the manifold completely cracked all around and all the way through. Strange because relatively new and the manifold was steel.