Trailblazer Fuel Injectors / Rail Replacement / Intake Removal 

One thing I was curious of was disconnecting old injectors and installing new. I’m sure I’ll be able to figure it out. Once again, you gave me the confidence to do it myself. Life long backyard mechanic pushing 72 y/o.

I needed to see how you separated the fuel rail/injectors from the engine block....many thanks. Learned a long time ago not to wrench/pull/torque or leverage things without seeing how they actually come out/off. Great help...another old guy (73)

Wow! $750.00 job at the shop, and now we know from you're video, we can knockout this job with patience. You're looking well Nathan, " Merry Christmas ⛄🎄 ✝️ to you"👍🏻🇺🇲

My Dad Loved This Video! Have 04 And Our Fuel Injector Went Out And Found Your Video Very Very Helpful! So Thank You Sir!

Man, you made my day. I have a gas smell coming from what seems to be the fuel rail under the plenum. I’ll be referencing you work hare as I proceed. Thanks, Steve Plymouth MA

Nathan!!! I had miss on 2 also suspected injectors and was waiting for injector video !! Tou da man.. luckily I changed plug and coil and was back up but now no readings from 02 sensors low voltage .

Glad you got it fixed, Nathan!

These videos keep getting better!

Nice video. These engines are known for loose intake manifold bolts. My envoy has 320k and tighten the bolts twice already. But now it's probably time to pull the manifold.

Thank you for this tutorial, and done the right way!!👍 I have yet to do this job on my Trailblazer.

💘 your video's! I've got a 2005 blazer wish mine was as clean like yours. Here in ohio every older car's a rusty mess underneath. But we must keep them going. I'm 73 and it takes a while for me to do the job. Would take a lot longer if I didn't have your help. I've done the brakes, rack and pinion, ball joints, sabilizer front and rear, rear end cover, plugs, coil packs, and the list keeps growing lol thanks for your help!!!

Thank you for the video! This helped me out so much and you saved me a ton of money! Thanks again

Doing this job this week, thanks for your video and hard work.

Thank you for the video 😁... I've been putting this off for a bit of time as well, think im going to get it done soon now that i got your video as a reference !!!

From Jackson Kentucky Bloody Breathitt County enjoyed watching you work on the chevy trail blazer. Got one with a misfire.

Thanks from Milwaukee

Where did you purchase your injectors? Seen 1 injector for over a hundred and seen 6 injectors for $60. Huge difference in price

Thanks for this!

I have a 2004 trail and the security locked stereo try’s to start but won’t kick over it was fine one day and the next nothing checked battery the fuses the starter plenty of gas this is all good can’t figure it out

That's is going to be my next proyect. I did change termostat and temp sensor. I have a Buick Rainier 05. Thanks a lot.

I did a timing chain on one and never ever again the amount of stuff you have to take off is insane

Merry Christmas!!!

Nice video. I remember the days of "Casper" being used as a derogatory term, to denigrate 'Whitey'. I also remember the cartoon, 'Casper the Friendly Ghost'... :D

Thanks for sharing ❤

Good video ...just one question....why do you remove the windshield washer tank 🤔

Watching from Plymouth, MA

Great video well explained well do my 2002envoy well take patience s thank again

Good work brother . Great attitude .

Kentucky. Have a GMC Envoy, I’m sure same engine. Have to do a valve cover gasket. I’m sure will have to do the same. Thank for the video.

Thank you Thank you!

Nate said ja77fu tool I couldn’t find it!!! Lolz Happy Holidays Nate Man!!!

Nice

Saludos desde Venezuela

Glad I found you, tx for your Trailblazer videos! My sister has a '03 with rich code P0172 and want to test the injectors for leaking but don't know how to get to them.

NYC BROOKLYN HERE - ‘05TB here and so as much as I can in the street etc

What type of gaskets are those??

You mentioned your injectors were $40 bucks or so. Question: each $40 or 6 for $40? I’m looking into replacing them all but listed the cheapest as $42 each.. please clarify. Thanks

Sure helped me out. BUT GUESS WHAT I GOT THE ENVOY YIKES 😅

So when I change the injectors should I go ahead and change the fuel filter as well? And what about the fuel pressure regulator? Because the issue I'm having is if I'm at a red light too long the vehicle will stall and either cut off completely or stall then continue to run. I also sometimes get the p0172 code from time to time

Hey can you please show me the location of the fuillvillter

Good job teach me a lot thanks

It must be running nice with those intake ports cleaned up and the plenum torqued on correctly. You have a shop? you do lots of work in the yard.

Bowling Green Kentucky

Hi .. what kind of vacuum can be used to clean the injector holes ? I’ve read how certain electric vacuum’s and dealing wit fuel directly should not mix or something like that

Iam 73 to hope to get the jobs you've done accomplished

Do you think taking the plastic cover off of the intake and throwing them away would hurt anything? I just would think the intake wouldn’t have static hot Air stuck in between ie letting air flow around it keeping it cooler and cooler intake charge.

Hi Nathan , I changed all my injectors (with the help from your video😁) and now the trailblazer cranks but wont start😰. Maybe you could point me in the right direction since you know these vehicles inside and out. Thank you!!

Was wondering what was the psi of your compression check? I read it was to be 215 but mine tested consistantly lower between 160 - 170 psi.

Hello, great vid.. I have an 04 LT w/6cyl. 1 code (P0455) evap issue. chasing that down. The issue/question I have concerns a rough idle that happens while in gear and break depressed/stopped. Idle is smooth until last 100 rpm drop to 600 then rough idle occurs. This immediately smooths out upon accel. pedal depress and rpms begin to raise. Power band is smooth, seems fine. Recent work, new fuel filter, evap purge valve, canister vent vale. spark plugs and recently 1 coil. The engine does not buck/shake it's a vibration and causes trim around back hatch to "buzz". If this was an old timey car a slight turn on a carb idle screw would fix it. Any advice would be greatly appreciated.

How can I tell if the intake bolts are loose? Can you grab and wiggle the whole thing?

Can a bad injector cause it to go into limp mode

Excellent 💯👍🏿 Also I have heard from waaaaaay more than one Trailblazer owner that those loose intake bolts can cause a rough idle & throw a code.

From San Juan Puerto Rico

good afternoon friend. Can you tell me in which direction the PCV lab valve is placed?

Hi Nathan. Your Trailblazer videos have been a great help. I have Question Plz. I have a multi misfire major power loss issue. Have replaced coils, plugs, cat conv.( it was ruined due to driver continuing to drive when running with misfires), throttle body crank sensor, cam sensor, pulled tank, ran fuel pressure chk, and preparing to do fuel injectors now . Before I do this let me explain how it all started. I was replacing headlights and blew a fuse. I pulled outer fuse box cover off and made wrong assumption that four small bolts held inner cover on, so I loosened completely all four. I put everything back together and forgot about fuse box bolts being loose. I tried starting it and no go. Realized fuse box bolts were loose tightened them and truck started with bad missfire. Owner continued to drive and performance deteriorated. When I started running codes and replacing parts things just kept getting worse. Sooo, my question: do fuel injectors or computer module, or is problem in fuse box. Only code now is a 300 multi misfires.

❤

How long did the entire job take you?

I jus pour Sea foam in it or white bottle lucus fuel injector cleaner, cleans it

If you will will you please answer me back and ASAP please what did you use to take that fuel line off and disconnect you stated that you use something like what is something like this can you please tell me a way to get that off without having to spend $24 that I don't have for a fuel line removal kit.

I’ve got a misfire after trying to start my envoy multiple times with insufficient fuel. Was really trying to be lazy and not have to walk to the gas station… Well the autozone reader said P0306, but after clearing the codes I only get a P0300. I was assuming clogged fuel injector but decided that since I took that intake manifold off once before and hated every minute that I didn’t want to do it again if unnecessary and I’d do a little diagnosis. It seems like it’s actually the coil based off of the engine idle not changing when I disconnect that coil, but then when I use a multimeter set to ohms, that coil tests the same as most of the others(didn’t pull number one cuz it’s underneath the wire harness). 4 out of 6 coils show continuity on pin 3, didn’t test one of them, and then one of them shows continuity on pin 1. But that’s not the one that I disconnected the cable to and the idle didn’t change. But the idle changed on all the rest. So now I’m super confused if it’s a clogged fuel injector from trying to force the car to start to get me to the gas station close by, or if it’s one of the ignition coils. But if it’s one or more of the ignition coils, I’m not sure. The ignition coil from cylinder 6 seems dead from pulling the cables while the engine is running but shows a similar multimeter reading while *cylinder 3 or cylinder 4* has a different reading. I’m baffled… don’t want to start throwing expensive parts at it though especially with the job and a half it is to get to the fuel injectors

Great video! I have a 2003 LT that's been parked on the side of my house for about 3 years. I replaced the spark plugs, new battery, oil, and fuel filter. The fuel filter was pretty plugged up. I drained most of the gas tank and added around 10 gallons of fresh fuel with some Sea Foam. I can keep it running with starting fluid. When I remove the fuel lines by the fuel regulator it seems like the fuel pump works intermittently, maybe weak? I did drain the fuel tank by bypassing the relay and drained it at the fuel filter. Does the fuel pump have a screen or filter on it, maybe clogged? I ordered new injectors and fuel pump. Any ideas? Thanks

Pain in the ass job But hey save myself $750 Gonna have to endure it. What a freaken pain in the ass job. LOL Thanks for the full clean extensive well descriptive Video My man

I couldn’t take off the back bolt so I gave up and paid $900 for a shop to take it off😢 maybe because my is a 2008

Not sure why you took the washer fluid tank off , kinda wasn't in the way at all , was it ? Gunna go for it on my 2006 Trailblazer, the schrader valve broke off the fuel rail when I was trying to do a cleaning with the canister type cleaning system. Oh and yes a big pain in the butt bracket is on those emissions lines and yours was already removed, lucky you , lol

Yea also pesty lean code

Im gonna klean mine I don’t understand how it’s a hard job wen I swapped my motor an dropped the trans now mine won’t start kus no fuel is gttin to the engine so I’m gonna klean them or replace em. Ppl are jst lazy

Didn't realize that vehicle has an inline 6?

Hawaii

Any direction is appreciated if anyone can assist in troubleshooting. After changing the valve cover gasket, intake manifold gasket and a fuel injector suddenly having issues with the transmission. Ran perfect for the first say 50 miles till a shift slippage going up grade was noted. There after it acts as though the transmission has lost every gear other than first and begins slipping in second. Not sure if it is a sensor or possibly vacuum issue. Again any assistance will be greatly appreciated 👍

I've seen plenty really appreciate the video but man you are brutal all that pulling , yanking , slaping and leaning on the intake made of plastc nylon just made me cringe your a true pioneer hope that's your car not someone else lol ...

I hate that u don’t show where the wire is plugged at for the fuel rail

You’re missing the steel bracket that’s busting my butt.

You skipped getting the fuel injectors out and into the fuel rail

Envoy and trailblazer biggest piece of shit gm made in 2000-2012. Along with a few others. Aside from that, the engine and transmission are solid, but everything else is garbage. Love/hate this car

No thanks 😳😬😳😬

Dude stop talking u have made this video wayyyy longer then need be.