- #26 of 36
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Engine Knocking in 2003 Trailblazer
by ticadoo
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Jun 02, 2009 (5:02 am)
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Help! The engine in my 2003 Chevrolet Trailblazer has started knocking! I only have 74,000 miles on it. What could it be? Any one else have these problems? 
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- #27 of 36
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Re: Engine Knocking in 2003 Trailblazer [ticadoo]
by burdawg
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Jun 02, 2009 (6:10 am)
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Replying to: ticadoo (Jun 02, 2009 5:02 am)
Can you describe the knock? Does it occur all the time, just when the engine is cold, or under certain conditions? Is it actually a knock, or more like a ticking noise?
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- #28 of 36
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Re: 2002 Trailblazer - New Engine at 85,000 miles - ouch! [clickytb]
by hineblazer
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Jun 11, 2009 (6:29 am)
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Replying to: clickytb (May 16, 2009 9:30 pm)
Not the same problems but GMs overall plan might have something to do with it. I have a 2005 TB 4WD and it was getting 10 to 11 mpg city most of its life except for maybe the first 6 months from a new purchase. I took it back to the dealer many times and they kept saying that that is what these trucks get for mpg. I tried many things like HHO add on kits and fuel additives. Nothing worked. I started looking into basic stuff like fluid levels on the differentials and transfer case and found that my transfer case was operating with about 1/2 quart of fluid. The manual and the dealer state that this would not need servicing or checking until 50K. At $13 a quart from the dealer (only place to get it) I added a little over 1 1/2 quarts. It was an amazing difference in performance including MPG. I am now getting closer to 15 to 16 mpg in the city. So much for suggested OEM maintenance. I feel that GM and other auto manufactures do these things intentionally to get consumers to buy new vehicles fare before it is necessary. The business model for (planned obsolescence) needs to change here the US or we will all soon be in tank. Based on the recent events it looks like many of us are already in the tank due to greed such as this.
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- #29 of 36
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Re: Engine Knocking in 2003 Trailblazer [ticadoo]
by hineblazer
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Jun 11, 2009 (6:34 am)
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Replying to: ticadoo (Jun 02, 2009 5:02 am)
Not sure but I have found that GM has a plan that is all about them. I have a 2005 TB 4WD and it was getting 10 to 11 mpg city most of its life except for maybe the first 6 months from a new purchase. I took it back to the dealer many times and they kept saying that that is what these trucks get for mpg. I tried many things like HHO add on kits and fuel additives. Nothing worked. I started looking into basic stuff like fluid levels on the differentials and transfer case and found that my transfer case was operating with about 1/2 quart of fluid. The manual and the dealer state that this would not need servicing or checking until 50K. At $13 a quart from the dealer (only place to get it) I added a little over 1 1/2 quarts. It was an amazing difference in performance including MPG. I am now getting closer to 15 to 16 mpg in the city. So much for suggested OEM maintenance. I feel that GM and other auto manufactures do these things intentionally to get consumers to buy new vehicles fare before it is necessary. The business model for (planned obsolescence) needs to change here the US or we will all soon be in tank. Based on the recent events it looks like many of us are already in the tank due to greed such as this.
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- #30 of 36
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2003 TB Problems
by juan12
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Jun 25, 2009 (11:04 am)
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Ok where do I start!!! First of all when I am driving and come to a stop or going up a hill my truck acts like it wants to cut off so I took it to dealer and he said it was the FAN CLUTCH got that fixed $600.00. After a month started back doing the same thing! Now on my dashboard the airbag light is on and all the right side lights are not working ( back head light, back light by the license plate, radio, and air condition lights) and the back wiper blade is going by itself and don't be turned on that is wild and crazy I hate to pull up in a parking space and look back and the wiper blade is really going and the truck is turned off  . I had the spark plugs changed last year thinking that was the problem why when I'm driving the truck sound like it is tuned up real loud and changing gear like a 18 wheeler. I know three more TB owners and they TB sounds the same way lord that is a killer on gas. I need some help or is it a recall on TB
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- #31 of 36
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Re: Engine Knocking in 2003 Trailblazer [burdawg]
by hodgemelody
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Nov 08, 2009 (11:15 pm)
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Replying to: burdawg (Jun 02, 2009 6:10 am)
I too have had the ticking noise. Does anyone else have this problem. Has anyone figured out what causes it?
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- #32 of 36
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2003 trailblazer ext. Lt
by hodgemelody
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Nov 08, 2009 (11:20 pm)
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Here are the problems I have.
Ticking noise, second row seat/passenger side window will not work, i was told by onstar that I am having a control sensor problem(i believe that is what she called it), when you take off it sounds like a jet taking off(is this natural?), .
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- #33 of 36
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Re: 2003 trailblazer ext. Lt [hodgemelody]
by ticadoo
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Nov 09, 2009 (6:33 am)
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Replying to: hodgemelody (Nov 08, 2009 11:20 pm)
I too had the fan clutch replaced...the "jet noise" and ticking stopped for a while..and is back again. This truck is possessed and nothing but junk. I've had so many problems with it and it just turned 80,000 miles. The driver's side turn signal/brake will not work when it rains; if I am using the CD player and put down the sun visor..the CD player stopps working; even with the wipers off...the come on by themselves...the A/C and heat works when/where it wants; the service engine light will not go off.....and the gas mileage is HORRIBLE. I can't afford another truck now...so I guess I'm stuck...
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- #34 of 36
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Re: 2003 trailblazer ext. Lt [hodgemelody]
by burdawg
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Nov 09, 2009 (7:03 am)
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Replying to: hodgemelody (Nov 08, 2009 11:20 pm)
Ticking noise - If it's the same problem we had a long time ago it was eliminated when the PCM was updated with new firmware, I believe it had something to do with altering the VVT until the engine was warmed up. We also had a loud "ratchet" type noise coming from under the dash, it was the mode door actuator and was repaired under warranty.
Window not working - shouldn't be that hard to diagnose/repair.
Loud noise when "taking off" - could be fan clutch, if it's not working right the fan will be on full force and will be noisy. It's another known potential problem area.
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- #35 of 36
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03 trtansmission
by jonal09
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Nov 19, 2009 (5:37 pm)
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my Trailblazer EXT tramssion won't shift into 3rd gear. any suggestion besides the expensive one?
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