I have seen a 2-3 mpg drove over the last 2 years. I have run Opti-Lube the last 2 tanks and seem to see 1.5 mgp increase. I recently replaced my FPR and it stopped my rough idle and generally made the truck run the best it has in quite some time. From the money I saved by doing it mayself, I got EFI live and removed my Edge box. Since then, I have been checking my injector balance rates and have seen cylinders 1,5 & 7 any where from 3.5 to 5.2 on any given day. The worst is 7 and it's always positive. 5 is good sometimes and bad sometimes but usually negative. One is always negative and runs close to 4. 3 (the only one left on that side) runs about +1. All the even cylinders are 2 or less. My question is: am I just fooling myself that I don't need to pull the trigger and get injectors? I have never seen over 6 in drive or over 4 in park negative or positive. The truck runs good but on occations seems to be running rich (smells bad and will burn your eyes). I don't see any smoke and have a slightly slower start than it used to. I work in Mexico everyday, so breaking down on the wrong side of the boarder can make it very complicated to get the truck towed back across. I have a dealer quote of $3600 to replace the injectors, but that doesn't include high pressure lines, etc. From the breakdown they gave me it's about $300 an injector. I assume they will hit me with those oops we found you need to replace these parts charges later. I can spend the same or less and get all new parts and do it myself but getting a couple days off work is tough. Do I order parts, take some vacation and do it myself or drop it off and take the cost creep risk? So I asked my esteemed page brothers and sisters, what would you do? :confused:

Oh and my last oil sample had no fuel in the oil.

Chantag, if it were me, I would plan on replaceing ALL of the associated fuel lines. From all of the reading I have done, it seems that water (rust) in our fuel is one of the main culprits of injector failure. The other factor in failure, in my opinion, is electrical in nature. It takes I believe 96 amps to fire one of our injectors (I stand to be corrected on this). Search for a member "Oddplanes" and read up on his electrical theory.

I am in the same boat as you. Noticable milage drop since I aquired the truck in 08 with 78,000 miles. Have ran 2 stroke oil about 95% of the time at fill ups (one quart per fill up). Truck runs strong, but at times a strong exhaust smell, and slight hazeing at night (seen from car behinds headlights). This is not all the time, but becoming more frequent.

Plan on price creep (I love that phrase) from the installing dealer, but realize if you plan to keep the truck, replacing all the lines may be money well spent. Good luck,

Jim

Had the injectors replaced and high pressure lines for $3600.00. I bought the parts and had a mechanic do the install. The thing is my core for the old injectors was a wash because the h/p lines were about as much as the core +/-.
After the injectors were put on I didnt get more than a few hundred miles before the old h/p lines failed and flooded the motor with fuel. Had it towed to the mechanic who replaced the lines (I bought them at his cost) and he installed them labor free.

Maybe you can get the parts and find a local trusted diesel mechanic to do the install.

Finding a good mechanic down here has been really tough. That's my biggest issue and why I consider doing it myself. Everytime someone tells me, oh I have this great mechanic I call and they don't want to touch the DMAX. That leads me to the dealer, but I don't want to spend an hour explaining all my extra filters and the lift pump, etc. I guess I should just buy all the parts and schedule some vacation.

Dont quote me on this, but I had my injectors done at the dealer, and with the high cost of parts in Alaska where I had them done at the time, it was like $4,500.00 for all 8 replaced. But I got a nifty 100,000 mile warranty on the injectors from the dealer. So if one goes out before then, I can have it replaced at no extra cost. Just a thought.

If you do it yourself or pay another mechanic to do the job for you, you may end up down the road with no warranty replacement and have to buy another injector and pay for labor as well. Then again, I dont know how good the Chevrolete warranty is when it comes time to deal...

Funny you mentioned this. I just took the plunge and had all 8 injectors replaced at the "stealer" this week to the tune of $4,800. I am the original owner of the truck and it has 155,500 miles on it, and 5,285 hours on the engine. Of course i didn't have a problem with them while it was under warranty, but it is what it is. I can't afford a new truck right now, so i fixed it. I had four bids. Two from dealers and two from independent shops. They ranged from $3,600 to $4,800. The independent shops were not using new Bosch Injectors. They were using something else. I decided to let the dealer do the work since they work on them all the time and i got a year's warranty on them. I change the fuel filter every oil change and that helped me on the first set. The truck had 5 injectors that were bad at the time, so i just decided to do all 8. It smelled bad like you were talking and it would go into limp mode in gear and only allow me to do 1800 rpm's, so max speed was about 65. You're going to have to do it, so start saving now.

Chuntag, if you have some mechanical knowledge then I would say do them yourself. My brother and I replaced a set of 8 in his truck with no previous dmax experience, granted he is a full time mechanic, but heck we're in our early 20's. The job really isnt very hard its just time consuming. We took our time and cleaned everything and it didnt even take us a full weekend. There are plenty of write ups on how to do the job on this site if you get in a bind.

I'm not too worried about doing it myself but trying to factor in the "warantee" aspect. I'm sitting on the fence between waiting until they are worse, doing it myself or sending it to the dealer and be done with it. I was quite pleased with the savings from doing my own FPR but this is a different time investment and greater risk if I mess something up. I usually don't but ......

Just ordered all the parts to replace the injectors and HP lines. #7 has been getting worse daily and was at 6.2 when I got home and #1 was 5.8. We shall see if that solves my MPG loss as well.

Just ordered all the parts to replace the injectors and HP lines. #7 has been getting worse daily and was at 6.2 when I got home and #1 was 5.8. We shall see if that solves my MPG loss as well.

Doing it yourself? I am taking my 01 in Monday to get the test done to see if my newly aquired smoke is injectors...

Yes I'm going to do it myself. I got a quote for $4600 to replace the injectors and hard lines and adjust the valves. They didn't include any of the "shop supplies" or additional gaskets and seals that I'm sure after 9 years will need to be replaced. I figured it would climb to $5k or more. I got all the parts and specialty tools like injector puller, 5mm swivel socket from Snap-On, 19mm flare nut socket for $3300 and the injectors come with a 1 year unlimited mileage warranty from a vendor I trust. On the 15th I'll have had it for 9 years exactly so I guess I can't complain. I did have 2 injectors replaced under warranty when I had a leaking injector cup 6 or 7 years ago but other than that it's run great. Only need to drive it 7 more years to meet the agreement with the wife to drive it until our oldest is in college :)

Finished my injector/HP lines change. The only issue was the coolant return tube from the heater core that didn't get on good and pumped out a gallon and a half before I figured it out. Balance rates are under 2.6 but we will see how it looks after some miles. Other than the drivers side cylinder next to the firewall, everything was not too bad. Hope I don't have to do it again for another 9 years to be honest. We will see how the mileage goes with the new squirters, hopefully back up.

Congrats on the change and doing it yourself. Keep us posted with your results in a few thousand miles.

I also adjusted the valves since I was in there. The engine is certainly quieter and it ran very smooth on the way to work this morning.