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2004 chevy trailblazer_lt
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4 Posts
Discussion Starter #1
I have a 2004 Trailblazer 4.2l I6. 2WD. LT(if it matters) I've had the TB for about 4 years now. I love it. But recently it started to knock and just progressed at a very fast rate. It's now making all kinds of squelling noises and just a loud knock that hits harder when I left off the gas. I've decided to sell my 05 R6 to pay for a swap in my TB. My TB has 147k miles. Regular maintenance. But after it started knocking I checked the oil and it was a couple quarts low. No signs of ANY leaking anywhere. Im wondering what would be the best way to go about it? What motors are a direct fit to my 04 TB? I should get about $3k fire my bike including extra stuff, would that be enough? I'm mechanically inclined and have changed the water pump, fan clutch, alternator, serpentine belt twice, oil changes, brakes, tire rotations, air filter changes, throttle body cleaning, spark plug changes (AC Delco), replaced 2 ignition coils, ect. Please help if you have ANY input for me.
 

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2004 chevy trailblazer_lt
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7 Posts
Interesting that you mentioned the low oil but no signs of leaking. I have the same truck and have to feed it oil quite often. It must be burning up somewhere. It's not on the engine, not in my coolant (though that is the snap answer given my mechanics too often-- that you have a blown head gasket).

The knocking could be from the low oil. Fill it up and see if that noise abates. These trucks can run on practically no oil (as I found out without realizing I was doing it). But they sure prefer having a nice supply.

But good luck with your engine swap out-- I would check the site, most likely someone has done it before.
 

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2006 gmc envoy_denali_xl
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24 Posts
42. I6 and a 5.3 V-8 as a standard engine and a 6.0 in the SS models. Any one of them should go into the engine bay with minor modifications if installing a 5.3 or 6.0. The 6.0 will require a trans swap also as it is a little more stout than the other two engines.

To do a straight rebuild should be cheaper and efficient, but make sure you have someone program the ecm afterwards to shut off the DoD/AFM. This is the function that actually burns our motors up, if that is shut off, you should get many more miles from your TB.

Good luck!
 

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2004 chevy trailblazer_lt
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4 Posts
Discussion Starter #4
I did the full swap. Straight across with an 02 4wheel drive. Everything went fairly smooth mechanically. But Im having some major issues. I'm going to list them and if anyone has any advice please help. First and most important. It won't start. Nothing. All dash lights active but won't crank. The fuel pump engages, the throttle body makes a noise and the computer makes a low pitch hum. Looked at the starter and compared the wiring with a video I seen to verify it, it was correct. But it's not engaging at all. Also when attempting to put it in neutral and applying the brake it won't shift. But my linkage to the tranny is unhooked because it's like a half inch off of where it would line up. But when going to pull the motor I had to shift it into neutral manually because I had to roll it backwards to fit the cherry picker. I obviously unhooked the linkage when I went to manually put it in neutral and not it's not lining up right but I was just just trying to hear the motor run. Lol I still had the headlights and grill all undone but I was losing daylight. Any information is needed. I'm completely lost and very frustrated. Don't even know where to begin.
 

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2004 chevy trailblazer_ls
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303 Posts
When you unhooked the trans linkage, it may have moved from park to drive or another gear so you could move it. Make sure the linkage and the switch are correctly aligned and in park.
 

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2004 chevy trailblazer_lt
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4 Posts
Discussion Starter #6
The shifter up front is in park but unmovable. Can't move the linkage but I can shift the trans on the side of it. I went back and forth on the shifting but can't figure out why it won't line up.
 

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2004 chevy trailblazer_lt
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Discussion Starter #7
Ok so swap is complete. Truck is running great. So I went yesterday and plugged in the battery. Turned the key and the only response I got was a check engine light. Key got stuck. Then unstuck as I unplugged and re plugged in the battery. While I was connecting the battery from the driver side tire next to the fuse block I hit the black ground on the inner wall nearest me and it sparked. So I stopped and tightened it up. No idea why it was loose. But it was just backed out enough to not connect right. Then I had full dash lights. No crank. And key was releasing every time. So I tried to shift. It was stuck. No brake click. Nothing. So I jumped under to the tranny and checked the Park neutral switch power plug was and it was undone. It was one big plug coming from wires but after messing with that for a while realizing you have to slide the side bracket back and putting it on and sliding it back completed the plugin. While I was down there I addressed the issue of the shifter linkage not lining up and found out the lever was flipped backwards because my brother in law unbolted it from the shaft where the park neutral switch slides through and I guess we put it on directly backwards because it came off the linkage when it hung. Fixed all that. So then I got into the TB and put the key in. All lights. And the brake released the shifter and I slid through the gears. Everything good. Put it in park and realized I didn't even try to start it so I tried and BOOM she came alive!! Everything working great. Ran it through. Did fluids. Trans, power steering, dexcool. Just wanted to update so it wasn't left hanging. Thank you all for you help!
 
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