I posted on the LB7 forum about my truck leaking coolant into the engine. I took it to the dealer and the s/w said it was the injector seals. He told me that a TSB had been sent saying to replace all eight injectors.

Well it seems that my truck got pushed on another s/w, this guy calls and said that my truck would be ready thursday. I asked about the injectors and he said they only replaced #7 and the seals and t-stats. I asked why I was told they were replacing all eight. He said the other s/w didn`t know what he was talking about. He even said he didn`t know much about diesels.

Are these guys just being lazy or is he right about not replacing all injectors. I`m really pissed right now, isn`t there anyone who knows how to fix these trucks w/o having to drive 1000 miles (Eric).

Is there a TSB on this and what does it say,thanks

wayne

The replacement of 8 is for the injector failure of the excesive return rate, fuel in oil, stalling and various codes. Yours is just an injector sleeve or seal failure. Dont know why they are even replacing the injector itself. Here is a short copy of the injector replacement.

Service Engine Soon (SES) Light, P0087, P0093, P1093, Low Power, No Start, Hard Start, Fuel in Crankcase (Replace All Injectors - New Strategy for High Fuel Return Rates) #04-06-04-007C - (Nov 10, 2004)
Service Engine Soon (SES) Light, P0087, P0093, P1093, Low Power, No Start, Hard Start, Fuel in Crankcase (Replace All Injectors -- New Strategy for High Fuel Return Rates)
2001-2004 Chevrolet Silverado

2003-2004 Chevrolet Kodiak C4500/C5500 Series

2001-2004 GMC Sierra

2003-2004 GMC Topkick C4500/C5500 Series

with 6.6L Duramax™ Diesel Engine (VIN 1 -- RPO LB7)

This bulletin is being revised to include the fuel filter. Please discard Corporate Bulletin Number 04-06-04-007B (Section 06-Engine).

Important: Before the technician begins diagnostics and repair, be sure to follow the guidelines in Corporate Service Bulletin 03-06-04-036 to avoid fuel system contamination.


Condition
Some owners may comment on the Service Engine Soon light becoming illuminated. Upon investigation, the technician will find DTCs P0087, P0093 or P1093. Additional customer comments may include a lack of power, a fuel smell on the oil dipstick, fuel in the engine oil, fuel coming out of the crankcase breather, the engine cranks but does not run, or a hard start condition. This condition will not cause an engine misfire. Do not apply this bulletin to any diagnostic other than what is identified in the chart below.

Cause
The fuel injectors have internal conditions that may cause them to return an excessive quantity of fuel to the tank, as well as leak fuel into the crankcase. Due to the return flow and/or leakage, the fuel injection pump may not be able to build up adequate fuel rail pressure.

Correction
Important: Before the technician begins diagnostics and repair, be sure to follow the guidelines in Corporate Service Bulletin 03-06-04-036 to avoid fuel system contamination.


Follow current diagnostics for the condition the vehicle is experiencing, then reference the table below. If the diagnostics lead to Fuel System Diagnosis - High Pressure Side, follow the diagnostic until the Fuel Injector Return Flow is measured at each cylinder bank return connection (bank to bank).

Condition
Start with this SI Diagnostic in the Diagnostic Information and Procedures sub-section of the Engine Controls Section

Delayed Start
Hard Start

Lack of Power
Lack of Power, Sluggishness or Sponginess

Engine Cranks but Does Not Run
Engine Cranks but Does Not Run

Fuel in Oil or Fuel leak out of breather
Fuel In Engine Oil in Engine Mechanical

DTC P0087
DTC P0087

DTC P0093
DTC P0093

DTC P1093
DTC P1093


Important: If SES light is illuminated, follow diagnostics for the DTC as indicated with the Tech 2.


Important: When installing the new fuel injectors, lubricate the inside of the fuel injector sleeve with clean engine oil prior to installing the injector. Do not lubricate the injector or o-ring seal prior to installation.


If fuel return flow on either the right or left cylinder bank is above the initial fuel injector bank return flow value, then replace all eight (8) fuel injectors using the Fuel Injector Replacement procedure in the Engine Controls section of the appropriate Service Manual.

Here is a short copy of the TSB that applies to your truck

Engine Coolant Loss with No Visible Leaks (Reseal Injector Sleeve) #03-06-02-005B - (Nov 18, 2004)

Engine Coolant Loss with No Visible Leaks (Reseal Injector Sleeve)
2001-2004 Chevrolet Silverado

2001-2004 GMC Sierra

2003-2004 Chevrolet and GMC C4500/5500 Models

with 6.6L Diesel Engine (VIN1 - RPO LB7)

This bulletin is being revised to add technician cautions. Please discard Corporate Bulletin Number 03-06-02-005A (Section 06-Engine).

<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1566698&psdid=271&evc=sm#ss1-1566698">Condition

Some owners may comment on engine coolant loss with no visible leaks. Excessive white smoke or a coolant type odor coming from the exhaust pipe, along with low coolant levels, may indicate coolant in the combustion chamber.

<A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=1566698&psdid=271&evc=sm#ss2-1566698">Cause

Condition may be caused by engine coolant entering the cylinder due to a dirty or damaged seal between the fuel injector sleeve and the cylinder head.

It just made me upset that the first guy told me all eight would be replaced and then they were not. I thought I lucked out since it was at the dealer anyway, Oh well.

I had an injector failure a year ago and another dealer replaced the left side, which turned out to be a seal they messed up.

Are any Techs that post here in or close to Maryland? I definitley will be taking it someplace that cares next time, hopefully not soon.

wayne

Not to upset you but it is very difficult to determine where a coolant leak comes from. Next to impossible. How they isolated it to one cylinder would be interesting to know.

Let us know if they truly fixed it. Give it some time.

Mike

Hoot, they said they removed the glowplugs and pressurized the coolant system. It took them nine days to do this. I just hope they put it back together right.

wayne

Yup, take the glow plugs out, pressure the system up and crank it over with white paper towel in front of the glow plug hole and see what comes out. Same test is used to find an injector that leaks fuel into the cylinder.

Cobra, are you a tech? If so where .

wayne

Fox Chevrolet in Timonium, md

What?? I wish I knew that 10 days ago. But I did just pick my truck up, I guess it`s ok. Snowing here right now.

Are you as good as Eric;) Well, at least I have someplace I`ll feel confident going to.

One thing I don`t understand, there is a list of parts they used, but no mention of an oil filter. It does have 10 qts of oil on the work sheet. You think they changed the oil and not the filter?

wayne

We change the filter, however, I do know that some follow the practice that if the oil was contaminated while the repair was being performed and none of that contaminated oil reached the filter by starting the vehicle, they wont replace the filter. A lot of your none GM extended warranties are the same way.

If you did want to ever bring your truck, just a little pre warning, I am one of 2 guys in the shop that works on diesels. So sometimes it can take a couple days for one of us to get to one.

As for how good I am, some of these guys have injectors down to 4 hours, I am not that fast, usually because I dont get left alone to get them done (I am the "Shop Forman", group leader and have 3-4 apprentices to look after) but I think I do pretty decent work :D

I may change the oil this weekend just to be safe.

Hope I don`t need you, but I know where you`re at if I do.

Thanks, Wayne