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04 Trailblazer

75HOW30

By 75HOW30
in Ask A GM Technician

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75HOW30 Enthusiast

75HOW30

Posted
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Got a 04 Trailblazer that is quiet when cold, problems is when it gets up to operating temp it gets a "ticking" noise. Noise is mostly heard from underneath and sounds a lot like a loose torque convertor bolt (sounds like crankshaft speed and is relative to engine speed, also is there at idle in any gear selection). Can be heard near flywheel area. Checked all torque converter bolts and they are tight. Removed torque converter bolts and inspected - no signs of rubbing/hitting anything. Started engine with bolts out and noise is gone. Reinstalled bolts and noise is back. No obvious signs of a cracked flywheel, although I cant rule this out untill it is removed and inspected closely. Was wondering about torque converter or trans pump noise.

 

Thanks in advance.

75HOW30 Enthusiast

75HOW30

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26 views with no replies doesnt sound good. :cheers: Gonna pull the trans tonite and hope for a cracked flywheel or a bolt sticking out of the back of the block contacting the flywheel.

minibike132 Senior Enthusiast

minibike132

Posted
Posted

I didn't respond because it sounds like you are on the right track. We have tick noise issues with valvetrain and one particular noise with the fan clutch at idle that there is a reprogram for but you seem to have it nailed down to the other side of the engine.

75HOW30 Enthusiast

75HOW30

Posted
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Posted
I didn't respond because it sounds like you are on the right track. We have tick noise issues with valvetrain and one particular noise with the fan clutch at idle that there is a reprogram for but you seem to have it nailed down to the other side of the engine.

 

 

Yeah I know about the 1 second interval tick at idle from the fan clutch and the reprogram. This vehicle does have that noise also, but at this time Im not worried about it. I pulled the trans last night and found nothing so far. :fume: Flywheel is in great shape, especially for 140,000 miles. The starter gear goes back in all the way and flywheel teeth look good. Did not have my trans tools with me, so looks like I will be going into it today. No bolts sticking out from enigne block or the trans (thinking possibly contacting flywheel or converter). My ideas are possible converter or pump, but not sure :cheers: . If you think of anything please let me know.

minibike132 Senior Enthusiast

minibike132

Posted
Posted

I don't do much trans work but I think I would replace the converter and pump while you are there just in case. I don't think you will see anything wrong with either one because the noise is going to require some load and pressure. Hopefully you get lucky and see something. I know that is a bit pricey to just throw at it but for my money it's more pricey time wise to be in there suspecting a problem and not doing anything about it. Good luck to you. While you are at it I would check crankshaft endplay, possibly taking the load off the crank made the noise go away if you have too much.

75HOW30 Enthusiast

75HOW30

Posted
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Posted
I don't do much trans work but I think I would replace the converter and pump while you are there just in case. I don't think you will see anything wrong with either one because the noise is going to require some load and pressure. Hopefully you get lucky and see something. I know that is a bit pricey to just throw at it but for my money it's more pricey time wise to be in there suspecting a problem and not doing anything about it. Good luck to you. While you are at it I would check crankshaft endplay, possibly taking the load off the crank made the noise go away if you have too much.

 

Pulled trans apart and found LOTS of metal particles in fluid; no peices or anything to tell me exactly where they might come from. Converter has metalic looking fluid, pump and cover are scored, valve body has several scored

valves, input housing has enough of this "overheated metalic fluid" "baked" onto it that I can actually scrape it off. Several bearings sound rough. :D Did not go any further---- It needs a new trans and we are currently looking for a good used model. Will let ya know after replacement, but Im sure that will fix her. :D

 

Thanks

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