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I think I just bought a 2004 trailblazer

9672 Views 162 Replies 11 Participants Last post by  tomcat709
So far, it's a verbal agreement. It will be my only vehicle with any towing capacity. I'd like to tow a small camper. Don't have the camper. It's RWD, I6, SWB, 177k miles. It has a 7 wire trailer connector but no brake controller. Just going over the RPO codes and it's got the 3.42 axle, no posi-traction, and a couple codes for California emissions. Apparently it was a California car in it's early life. The price is right. The rust is less than most here in Indiana. It's gonna need some work on a power steering leak and some front suspension parts.
Runs good, sounds good except for PS whine, shifts good. Trans dip stick is missing. Seller seems like a good guy.
We have to get an emissions test in this Indiana county. Is the California emissions stuff something to worry about? Does it effect the performance or towing ability?
Supposed to pick it up Friday.
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Trust me, if it's the low pressure line, the high pressure hose is on it's way out too. I tried to do a band aid fix of the high side line using Gates high pressure power steering hose and several hose clamps. It worked for about 6 miles and then blew as I was pulling into a parking space. What a mess! Anyway, order a full set of Gates or ACDelco hoses, set a weekend aside and replace all the power steering lines at one time.
Try Kroil. That stuff is great!!
Spray the nut and threads with Kroil or AeroKroil. That stuff is truly magic on stuck nuts like this.
If you spliced the high pressure line, expect more leaks until you replace the entire line. Ask me how I know...
If I recall correctly, there are a couple of fasteners in the middle and then at the ends, it just pushes in and pulls out (although don't quote me - it's been 3.5 years since I had the grill off.

Go to and put your information in. Then go to cooling parts. There are several images of how the various grills go onto the vehicle.
Well, since I do not like to purchase auto parts from unknown online sellers, and used parts like this cooler could be rusted as badly as yours is, I would go with a new Dorman 918-300 cooler.

I see that it is not in stock at for $94.57, but it appears to be in stock at for $124.99. This is what I replaced mine with and it is a decent cooler. If it ever leaks, well, it will be replaced under warranty since it comes with a lifetime warranty.

Good Luck!
Now the wiper motor is another matter! Definitely get that!
Power steering fluid does not have a "standard color" to it.
That would be 41 years Kemosabe
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Oh my. That's what you get for not harassing us enough and torturing all those trout!
No. Ravalli was wondering where you are located because if you were in California, there is no way your TrailBlazer would have passed an emissions test/inspection there.

I bet if you lived in Chicago/Cook County or one of the adjacent Illinois counties, you might not have passes either. Good thing you only have to deal with the Hoosiers! FYI, I lived in Hancock County for 4 years (far east side of Indianapolis) and did not need to worry about such things there. Now, I'm in Maryland and while they are not as rigid as California, they are getting that way. I guess emission nazis are the same everywhere anymore.
I have a suggestion for johnd393. The next time you have a problem or concern with your TrailBlazer, please start a new thread rather than adding to a thread that was started in September 2020. I know it's nice to have your history in one place, but for this forum it really is not practical - for you, yes; for the rest of us, no.

OK on the current update report - thanks!

Yes, P0134 and P0135 are for the upstream O2 sensor and hopefully you'll nail that little groundhog and be done with them for ever (or at least a few months).

Regarding the P0306, did you ever get your spark plugs changed? If yes, did you use the ACDelco 41-103 plug? I know it can be a pain to get back to the #6 plug, but getting at the #6 ignition coil should be a little easier. What I would do is to swap the #6 ignition coil with the #4 ignition coil to see if the P0306 becomes a P0304. If it does, that indicates a likely defective ignition coil. If not and the P0306 is still present, I would then switch the #6 spark plug with the #4 plug and once again see if the P0306 becomes a P0304. If still no change, well then you could try swapping the #6 fuel injector with the #4 injector and see if the code now moves.

Also with respect to the Torque Pro app, you can see what the misfire count is for the #6 cylinder. What number do you get for the #6 misfires count?

Good Luck!
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Pr do the poor man's trick for extra leverage. Get a 4 to 6 foot iron pipe and slip one end over the ratchet handle and then stand by the end of the pipe and push it up. That should get the O2 sensor loose. Save the pipe because it will come in handy if you ever need to remove the caliper brackets!!!!
Congrats! Let's keep our fingers crossed!

Good Luck!
Denso is a great choice! That is what I use on all my vehicles when I need an O2 sensor.
"Normal people"?

I mow my fields at midnight with a bank of LEDs facing forward and backwards on my tractor and a Cherry Bomb muffler.
And your nearest neighbor is how far away?

For the gas gauge, try adding once can of Berryman B-12 to the gas tank before your next fill up. If there is any crud on the fuel gauge sending unit in the gas tank, it will clean it up. Also, if there is any varnish in the fuel system, it will dissolve it and mix it in with the gas and you'll burn it up via the combustion process. At the worst, it won't do anything and you'll find out that the fuel gauge sending unit has a larger problem.
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