'01 smoking after changing fuel pressure regulator

[dieselbreath]

hello loosedrag
I too am experiencing smoke after replacing the FPR. I replaced it with a Bosch. My vehicle is a 2002 chevy duramax 6.6 turbo. Have you found a fix other than having to replace the injectors? It gnaws at me to have to replace injectors because it was not smoking until after I replaced the FPR. Mechanic says injectors all show to be running in spec and that I have fuel in pipes and need to run it for a while but its been about 500 miles and it is still smoking. I have a few acres outside the city limits, if I have to replace injectors there is going to be a bonfire! So any other ideas are certainly welcomed.

[Kennedy]

When the VCOI nozzles start to seep pressure can influence the severity. Odds are you are now holding a steady and likely lower pressure.

To solve the repeated LB7 injector issues we offer two solutions:

1) Brand new VCO style with enhanced durability coatings on the needles

2) SAC 45 which is the end all fix

[DieselDavy]

I would advice both of you guys to get with Kennedy and get the good parts!
He carries the good stuff and knows what he is talking about.
AND you can trust him!
Dave

[markelectric]

Question to John, Why do you think the SAC injectors are the "end all" fix? They have not been around all that long ( for the Lb7 ) to have that kind of a track record. My nephew works for S&S, builds the injectors. He says that this is still being "tried" , not proven.

I ask because I have an 01 smoking out intersections now also. That means It wants me to buy yet another set of sprays for it. Wondering about being a rolling Ginnie pig for them.

[Kennedy]

Question to John, Why do you think the SAC injectors are the "end all" fix? They have not been around all that long ( for the Lb7 ) to have that kind of a track record. My nephew works for S&S, builds the injectors. He says that this is still being "tried" , not proven.

I ask because I have an 01 smoking out intersections now also. That means It wants me to buy yet another set of sprays for it. Wondering about being a rolling Ginnie pig for them.

First I trust my expert contacts in the fuel system business. It's not difficult to see the merits from there. The VCO design is unique to the LB7. The smoke at idle is also unique to the LB7. The SAC type nozzle is used in all other Dmax injectors and does not do the idle smoke deal.


We don't do a ton of these jobs, but when I saw 40k fail points on several sets that we did in house WITH mega filter and lift pumps I knew something was not right.

I will reserve comment on the "tried not proven" statement.

[loosedrag]

hello loosedrag
I too am experiencing smoke after replacing the FPR. I replaced it with a Bosch. My vehicle is a 2002 chevy duramax 6.6 turbo. Have you found a fix other than having to replace the injectors? It gnaws at me to have to replace injectors because it was not smoking until after I replaced the FPR. Mechanic says injectors all show to be running in spec and that I have fuel in pipes and need to run it for a while but its been about 500 miles and it is still smoking. I have a few acres outside the city limits, if I have to replace injectors there is going to be a bonfire! So any other ideas are certainly welcomed.

Dieselbreath, After changing out my FPR, I took my truck to as many local diesel mechanics as I could find (not the dealer) and none could give me solid reason why my truck was smoking so profusely. The consensus was that the truck had 350,000 miles on it, with 240,000 on the current set of injectors, so injectors were the likely culprit. No one could say without pulling them and testing them. As I just narrated in a separate post on this feed, I elected to go the cheapest route thinking I was smarter than the average non-mechanic. Maybe I was, maybe I wasn't. But I learned first-hand that I definitely wasn't as smart as folks who do this for a living. (The local bosch injector dealer would have tested my current set for $50 each and sold me remanufactured bosch for $300 each to replace the ones that needed replacing, with no testing charge on the replaced ones. In hindsight that's the deal I wish I'd taken.) So my non-educated, experienced opinion is that you probably should change your injectors if they have lots of miles on them. And avoid "injectorsdirect.com", no matter how much "good press" they say they've received. I know first hand they're not someone I'd deal with twice. Hope that helps. BTW, six months after the injector replace, my transfer case went out. Yippee!

[More Power]

BTW, six months after the injector replace, my transfer case went out. Yippee!

Experience is priceless. Maybe someone here can report what a new monthly truck payment is these days. My guess is that you got your truck back for a lot less than a year's worth of truck payments. Not bad for 16 years of mostly no repairs.

We've saved GM diesel owners many millions of dollars through the years. You can trust what you read here. Experience is priceless.

[cabletech]

When I bought my 2017 High Country the dealer showed me options from no down payment to 50% down. The no down option was $1100 plus for a $66k truck. At that rate if his truck was in otherwise good shape $5k was a good investment compared to a new truck.

Jay