The ext. Manifold on my 2004 trl Blazer has a leak in the maifold body. The vehicle has approx. 120000 miles on it. This should be a recall item for manufacturing defect, but GM has not as of yet, issued a recall. It is a costly repair, as well as a safety concern, given that the exhaust fumes can enter the passenger compartment of the vehicle. I have owned many GM vehicles overtime, and never seen this before.

- Elizabeth City, NC, USA

Check engine light - for over one year now, and 4 various mechanics, no once can figure out why my check engine light comes on. I have replaced two air sensors (actually 3 - one was bad)... I have spent close to $1,000 to get this fixed - but the dam light continues to go on (intermittently) sometimes it's on for a month - off a day - on two weeks - there is no pattern. The last time the light came on, my car began stalling in traffic and stop signs. Last mechanic spent 5 hours tracing all the codes back - nothing. Next day had another mechanic check codes and the engine running cool as well as a few others showed up. If no one can figure this out - where is the recourse. I feel like I am being scammed over and over. I stalled on rt. 24 slowing down in traffic - and was almost hit by a box truck because I just sat there. Who can help direct me to a repair which will ultimately end this issue? now, the lights off this week (watch, now that I say this it will come back on). The only thing I notice is that many times the light turned off after I filled the tank. So, is there anyone out there who knows what's wrong (referring to mechanics who take us for a ride $$$)? I challenge anyone out there to figure this out.

- Taunton, MA, USA

I own a 2004 Trailblazer ext with the I6 and I've been getting strong smells of exhaust fumes inside the vehicle do to a faulty exhaust manifold that is cracked. It seems that it happens to 90 percent of the trailblazers with the I6 motor. Come to find out that the exhaust manifold is on national back order which tells me that GM should do something about this seeing that it's hard to drive around with the windows up and the heat on. Not only is it a safety hazard but it's also an emission issue.

- Onalaska, WI, USA

I own a 2004 Chevrolet Trailblazer ext. Took the vehicle in October 2009 for a oil change & a exhaust leak was told the exhaust manifold needed to be replaced, after searching on the internet found out it is a known problem that GM when manufacturing the vehicle used bolts that were to long therefore the exhaust manifold wasn't properly torque/tightened which made the manifold vibrate until it broke and prior to its breaking it leaked the manifold becomes loose and that leads to it cracking. After having the vehicle repaired at the cost of $319.50 & having it back for a month & driving it 3 times my speedometer went haywire registering a sitting still speed of 45 mph. Once again looked on the internet and found numerous complaints about the instrument panel cluster they have issued recalls for the Chevy trucks and Yukon GMC for the same issue but no recall so far about the trailblazer. This repair will cost me $516.33, both of these repairs are due to faulty manufacturing & should be listed as a recall. I just hope that none of the other issues I have read about becomes a concern for me.

- Chardon, OH, USA

I own a 2004 Chevrolet Trailblazer ext. Took the vehicle in October 2009 for a oil change & a exhaust leak was told the exhaust manifold needed to be replaced, after searching on the internet found out it is a known problem that GM when manufacturing the vehicle used bolts that were to long making the manifold get to hot and therefore leads to it cracking. After having the vehicle repaired at the cost of $319.50 & having it back for a month & driving it 3 times my speedometer went haywire registering a sitting still speed of 45 mph. Once again looked on the internet and found numerous complaints about the instrument panel cluster they have issued recalls for the Chevy trucks and Yukon GMC for the same issue but no recall so far about the trailblazer. This repair will cost me $516.33, both of these repairs are due to faulty manufacturing & should be listed as a recall. I just hope that none of the other issues I have read about becomes a concern for me.

- Chardon, OH, USA

Ticking noise from engine has been diagnosed as a cracked exhaust manifold. This should be covered by GM as a warranty item since there have been so many exhaust manifold failures related to the 4.2 liter six cylinder engine.

- Clarkston, MI, USA