Some peoples' kids (Duramax owners).
 

I thought you guys might enjoy this. I am doing a set of injectors on an 04 LB7 Duramax for black smoke puffs at idle and a bit of combustion knock.

This is something that I just find really funny. "Hey, y'all! Let's put a 3.5" straight-through muffler on this Duramax to get rid of the restrictive muffler. THEN, we'll bend up this piece of 2.5 pipe to connect it to the original 3.5" tailpipe!"

http://i641.photobucket.com/albums/u...r/DSCN2453.jpg

http://i641.photobucket.com/albums/u...r/DSCN2454.jpg

http://i641.photobucket.com/albums/u...r/DSCN2455.jpg

HAHA! As long as it sounds cool, who cares?

I need to start taking pictures of homemade exhaust systems....especially when they try and put stacks on.

hey that looks like some of my welding...haha

maybe that muffler was a little too free flowing

:smiley_roll1: And I bet they were still saying their truck was the fastest thing on Earth. :hehe:

Ugh.

This set of injectors is the most "nightmare-ish" set I've ever done. I spent two hours just removing the even bank (driver's side); and that's after I already had the valve cover off. The nozzles were so carbon-ed up that I spent about 20-30 minutes on each one working them out little by little. I had one on the odd bank come out with the injector sleeve, so I had to reseal and reinstall that one (draining most of the coolant into the cylinder and on the floor in the process....I hate that). That's only the second one that I've ever had the sleeve come out (out of the dozens I've done) but it's not a big deal to reseal them. It just takes a 24 hour cure time for the loctite where it seals into the combustion chamber. I was a good bit tired after bending over that long on my knees, so I called it quits at 10:30 last night. I should have it running again later this afternoon. I still have to run to town and use my friend's sand blasting cabinet to clean the corrosion off of the injector feed lines.

Those duramaxes take a little bit of money when those injectors are changed.....

Yep, they were my bread and butter for quite a few years. :cheesy smile:

Last set I did sounded about the same, but never pulled a sleeve. I even bought the OTC tool to pull the old ones out, and it was still a bear!

Well, it's getting towed to a dealership. Stupid people driving on bad injectors for a year and the carbon that is created on the nozzle..... :cursin:

I disrupted the loctite seal at the combustion chamber on at least one more injector and I don't have the puller tool. I'm not about to tear into that again and risk screwing up a cup with some hillbilly ingenuity.

Looks like I did the next guy a huge favor....those injectors will pop right out this time!

Oh well, not like I'm out anything except a few hours. Nothing else was waiting in line anyway.

Damn, that sucks Cody!

Sometimes you can do everything right and something still goes wrong.

Was it leaking coolant into a cylinder?

Yeah.

But it's down the road motors right now. I decided to start it this morning. I'll be danged if it isn't working flawlessly. It doesn't pressurize the coolant, it doesn't smoke, nothing. So the customer came to get it. He's going to drive it and see how it works out. He's cool with it....he is understanding of the circumstances. I think he'll be good to go. If not, off to the dealer it will go. Obviously I haven't charged him. If it works out, then I will get my money.

Could it just have been residual coolant left in the cylinder/ exhaust?

I'm thinking that it may have gone from cylinder #5 (the one cup that did pull out) and it filled the exhaust manifold and got into #7 as I was bumping it over. The guy's got 100 miles on it already with no problems as of yet.

dumb dmax's saw one today the guy was driving the thing with half a set of bad injectors it was smoking white so bad, straight raw fuel.. think he would be smart...but guess not..clean truck too.

Picked up another one today.

I have NEVER heard one knock this bad with such little injection pressure.

CHA-CHING!!!!!


I've seen a couple around town that I've thought about confronting the owners about, but on the same token, while the job does pay very well, it's also one of those jobs that you WORK for the money.

I have one in now thats getting a set of injectors....fun fun.

I get to take this one back apart since the guy brought his own injectors from NAPA....

#2 overfueling.

GRAND. I won't have that injector until Tuesday....and it just has to be on the hard side (even bank).

If once isn't bad enough, twice certainly sucks.

Were your fuel trims out, puffing black smoke at idle?

Slight knock at idle and 13% balance rate on that hole (when the rest were + or - 1).

Not acceptable. Runs like a mad chief though which is better than I can say than it did before. Anything over 1/4 APP and the thing would start frickin' rattling to beat the band and smoke out both lanes.

LOL


About 8 hours later I got mine finished up, runs a little better with injectors that dont look like this......

http://i619.photobucket.com/albums/t.../IMAG_0010.jpg

After the first half dozen, you'll get it down to 5 hours.

I got this one buttoned up this afternoon. It's amazing how these trucks even run when the inlets get clogged up (by the way, you ain't got nothin' on the last two sets I've done).

I have only done a couple D-Max injector changes so far (thank goodness:)), but I was still able to beat book time.

Now if only there was a better tool for popping the injectors out I could save a ton of time. That stupid OTC tool and a screwdriver cannot be the most efficient way of doing it.

I am surprised it ran as well as it did, only complaint on my RO was a haze at idle, otherwise ran fine.

If you want, I can send you an old injector line I modified that you can grab onto while twisting and pulling....also I weld a lip onto the big end so one can use a 10 inch prybar and use a rocker shaft bolt to pry against. I've got at least a dozen extra lines, so it's no problem to send one.


Yep, underfuel at idle (white haze) and then the severe overcorrection at all other times.....

It's amazing how one of these trucks can overfuel when all of the inlets are plugged solid. The one I did previous to this one had so much crap in there that it was nearly level with the top...but you couldn't keep it from fogging out the whole highway when rolling into it.

Oh well. Money in my pocket and a happy local since he can drive his truck again. The next one I do I will be sure to let the customer know that if he wants to go "cheap" on the injectors by buying them somewhere besides GM, I will charge extra if I have to tear it apart again. NAPA won't reimburse my additional time to go back into the even bank to replace one of their faulty injectors that lasted about 5 minutes. I won't even worry about actual Bosch remans from GM. Dozens and dozens of those and I have NEVER had a problem.

Thought I might dig this one back up. Had one come in with a terrible knock and ridiculous amounts of black smoke. After finding the injector that was the issue and verifying it still had compression (guy drove it quite a ways like this) I decided it was this trucks turn do get a set of injectors.

I spent the past few hours pulling down the passenger side I got to the #5 injector and guess what - the sleeve popped out. I was amazed how easily the injector popped loose, then go to pull it out and make one hell of a mess of everything when coolant comes shooting out....joy.

I do have a question though, when I push the sleeve back in do I stick the injector in while I wait for the Loctite to cure?

I do.

I just leave the coolant out and let it sit overnight afterward.

This way, if you're feeling confident (no reason not to), you can at least get the truck put back together (since getting to the injectors is the time consuming part anyway!!).