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Ok, I'm hoping the motor isn't cooked. The problem started today, it ran fine yesterday, in a stock tune, the truck loses power and boost when put the throttle we were losing speed and boost and then I looked back, and once, there was a little puff of white smoke, I hope it is no the motor. It was running fine yesterday. Also, it kind of smelled, don't know what but it smelled, all the temps were in check, but the boost fell when you gased it. So if anyone can help, that would be great. Also, it isn't shaking badly or anything like that. Also, the MPG has been decreasing, from 20 highway to 11 highway, and whenever you start the truck, the change engine oil light comes on, but t he oil was changes 100 miles ago, and then it goes off immediately.

 

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Boost leak? Torn boot? Ect?

 

Dave

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Ok, I'm hoping the motor isn't cooked. The problem started today, it ran fine yesterday, in a stock tune, the truck loses power and boost when put the throttle we were losing speed and boost and then I looked back, and once, there was a little puff of white smoke, I hope it is no the motor. It was running fine yesterday. Also, it kind of smelled, don't know what but it smelled, all the temps were in check, but the boost fell when you gased it. So if anyone can help, that would be great. Also, it isn't shaking badly or anything like that. Also, the MPG has been decreasing, from 20 highway to 11 highway, and whenever you start the truck, the change engine oil light comes on, but t he oil was changes 100 miles ago, and then it goes off immediately.

 

 

Drew, I would check your MAF sensor first and clean it, followed by a balance rate check of your injectors with a Tech2

 

Also check your fuel filter. Start with the basics first, and let us know what you come up with. Also pull the dipstick and drop the oil on a piece of white paper. Does it look like normal oil or does it look like a chocolate malt?

 

Let us know what you find.

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Thanks juice, we can almost rule out the fuel filter because it was changed less than 1000 miles ago, and that was before the redline dyno day 3 months ago.

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Thanks juice, we can almost rule out the fuel filter because it was changed less than 1000 miles ago, and that was before the redline dyno day 3 months ago.

 

 

No worries, just start with the simple things and see if the situation improves.

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We'll try replacing the fuel filter to see if that helps.

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Ok, I'm hoping the motor isn't cooked. The problem started today, it ran fine yesterday, in a stock tune, the truck loses power and boost when put the throttle we were losing speed and boost and then I looked back, and once, there was a little puff of white smoke, I hope it is no the motor. It was running fine yesterday. Also, it kind of smelled, don't know what but it smelled, all the temps were in check, but the boost fell when you gased it. So if anyone can help, that would be great. Also, it isn't shaking badly or anything like that. Also, the MPG has been decreasing, from 20 highway to 11 highway, and whenever you start the truck, the change engine oil light comes on, but t he oil was changes 100 miles ago, and then it goes off immediately.

How the boost, sure hope you blew off a hose after teh dyno run.

 

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If you had EFI Live you could reset the oil[ change indicator to come on whenever you wanted (mine is set for every 3000 miles) but it is easy enough to turn off, with the key in the run position (not started) depress the accelerator pedal three times all the way to the floor slowly both ways. Then start the truck and no more oil light!!!!

 

Check for a boost leak then get someone to check the balance rates! -Jeff

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I got a P0087, and this technical service bulletin describes exactly what is happening

 

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)

#04-06-04-007 - (02/18/2004)

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 Duramaxâ„¢ Diesel Engine (VIN 1 -- RPO LB7)

 

 

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.

 

 

 

Important:

'GM of Canada' dealers are required to contact the GM Technical Assistance Centre (TAC) to review the completed diagnostic worksheet and obtain a case number prior to injector replacement.

 

 

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 eSI 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.

 

Record all diagnostic data as outlined on a copy of the attached diagnostic worksheet. The diagnostic worksheet and a copy of the repair order is to be returned with the removed injectors.

 

After replacing injectors, perform the following steps:

 

Install all disconnected and removed components. Refer to the applicable procedures.

Start and idle the engine. You may have to prime the fuel system before the engine will start.

Connect a scan tool.

Command the fuel pressure control to 160 MPa with a scan tool.

If the fuel pressure is more than 145 MPa, the system is OK.

If the fuel pressure is unable to increase to more than 145 MPa, replace the fuel injection pump. Refer to Fuel Injection Pump Replacement in the appropriate Service Manual.

Be sure to record fuel pressure readings on the diagnostic worksheet.

Parts Information

Part Number

Description

Qty

 

97729095*

Injector - Fuel

8

 

97188896

Gasket - Valve Rocker Arm Cover

 

(Reusable Gasket)

As Req'd

 

97228933

Gasket - Fuel Injection Fuel Return Pipe and Injector

8

 

97600925

Gasket - Fuel Injection Fuel Return Pipe

2

 

94011604

Seal - Water outlet

1

 

97720043

Sealant

1

 

97188463

Sleeve, Injector

As Req'd

 

94051259

Seal, O-ring - Injector Sleeve

As Req'd

 

 

Parts are currently available from GMSPO.

 

*P/N 97729095 is only available in a merchandising pack quantity of 4. Current order restriction limits availability to 8 per VIN.

 

Warranty Information

For vehicles repaired under warranty, use:

 

Labor Operation

Description

Labor Time

 

J7801

Injector, Fuel -- Diagnose & Replace

8.0 hrs*

 

*Note: The labor time represents a reduction over the previously published time due to unnecessary steps in the repair procedure being eliminated, such as removing the radiator shroud and accessory drive belt. Also, the original add time to replace all injectors was overstated. Finally, the number of diagnostic steps have been adjusted because individual injectors are not being diagnosed. The labor time guide will be revised in the near future.

 

 

 

Important

All replaced injectors must be returned to the WPC. Please follow Corporate Bulletin #99-00-89-019B that applies to the WPC return procedures. Canadian dealers should refer to "Home Office Letter #99-201" dated 01-05-99 for all WPC returns. All eight (8) injectors of a single engine must arrive at the WPC boxed or bagged together. A copy of the repair order and the completed diagnostic worksheet should be included with the injectors. The tags found in the replacement injector box must be completed and attached to each injector. The WPC will be verifying sets of injectors for high flow rates.

 

 

Diagnostic Worksheet for Diesel Fuel Injector Replacement Data

VIN Number:

 

Date:

 

Mileage:

Hours:

Page: 1

 

Customer Concern

 

Comments __________________________________________________ ________________ __________________________________________________ _________________________

 

Technician Observations (confirm customer concern, different condition, DTCs)

 

Comments

Confirmed Customer Concern: YES / NO

 

DTC: P0087 P0093 P1093 None Other: ________________________

 

Unusual Conditions Observed: ______________________________

 

Key On Engine Off Actual Fuel Rail Pressure:

__________

Mpa

 

Fuel Supply vacuum at idle:

__________

inches / mm

 

Fuel Supply vacuum at highway speed:

 

__________

inches / mm

 

Set Parking Brake and perform the next test in Neutral (Manual Transmission) or Drive (Automatic Transmission), if engine does not run, skip the fuel pressure test

 

Commanded Fuel Press. @ idle with Tech 2

25 Mpa

40 Mpa

50 Mpa

60 Mpa

70 Mpa

80 Mpa

90 Mpa

100 Mpa

150 Mpa

160 Mpa

 

Actual Fuel Press. @ idle with Tech 2

 

 

 

Engine Cranks but Does Not Run specific values:

 

Ignition 1 voltage parameter on T2

__________

Volts

 

Engine speed while cranking on T2

__________

RPM

 

Prime Pressure (step 9)

__________

psi

 

Lowest pressure in 2 minutes (step 10)

__________

psi

 

Actual Fuel Rail Pressure Cranking (Step 13)

 

__________

Mpa

 

Cylinder Compression Values

1

2

3

4

5

6

7

8

 

(Step 11)

 

(Step 12)

 

Vapors (Y/N)

 

Fuel System Diagnosis-High Pressure Side Observed Values: Concern of P0087, P1093, Hard Start, Lack of Power, Engine Cranks but Does Not Run

 

Fuel API Rating ________

Step 23.

Initial Injector Bank Return Flows:

 

Fuel Temperature ________ Deg. C or F

Left (Driver) Bank:

__________

ml

 

Command Fuel Pressure to 160 Mpa with scan tool

Right (Passenger) Bank

__________

ml

 

Commanded FRP=160

 

Actual FRP= __________Mpa

 

After fuel Injector Replacement

 

Commanded FRP=160

Actual FRP= __________Mpa

 

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION

Edited by Dieselson

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Well, what is the status?

 

Sorry for the late reply, lift pump!

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