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HomeShopEngineSPN 132x FMI 31 Misfire Cylinder

SPN 132x FMI 31 Misfire Cylinder

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Description

DESCRIPTION
This document provides diagnostics and repair procedures for SPN 132x FMI 31 Misfire Cylinder – (x) fault codes. Thoroughly review the document to ensure that the engine is repaired correctly and within warranty guidelines. Safeguards have been included in certain calibrations to prevent engine damage, and will not allow the engine to restart.

SYMPTOMS
Diagnostic Trouble Codes:

Customer Observations or Concerns:
-­ Misfire or rough running engine
– Engine Self Shut-down
­- MIL Lamp

Fault Code Entry Conditions:

Related Fault Codes:

SPECIAL TOOLS / SOFTWARE

SERVICE PARTS INFORMATION

DIAGNOSTIC STEPS
Before following SPN132(x)- FMI 31 diagnostics please perform CPA RCT (relative compression test) and CPA Injector test before diagnostics and after repairs are completed.

Step 1: Follow directions in the document below. Record CPA data before diagnostics. 13L CPA RCT and Injector test (open and print out)

Step 2: Follow SPN132(x)-FMI 31 misfire diagnostics as they are listed in the FCAP work package. Follow the links based on the fault(s) listed in the health report.

Step 3: If parts were replaced, perform CPA RCT and CPA Injector test again (use the PDF listed in Step 1).

Step 4: Open a case file and attach the before and after CPA recordings. In the case file description add notes explaining that the case file is for CPA data ONLY and what the final repair involved.

If the resolution involved replacing injector(s) then ask to have the injector(s) blue tag returned to Muj Aidroos at the Woodridge facility. Tech Services will then close the case file.

TECH TIPS
For Head Replacements
1. Transfer 6 injector hold down spacer pucks beneath the injector hold downs over to the new head (Figure 1)
2. Compare the new and old Cylinder Head Gaskets. If an 11L Cylinder Head Gasket is installed on a 13L engine it will prevent the pistons from reaching top dead center once the head is torqued down. since the bore size is smaller than a 13L Piston.
A. 11L Gasket does NOT have a notch at the RR corner of the cylinder head gasket (Figure 2)
B. 13L Gasket does have a notch at the RR corner of the cylinder head gasket (Figure 3)
3. Be sure to properly time the cam gear per the service manual.
4. Reuse the Cam Bearings unless they are damaged

TEST PROCEDURE(s)
Cylinder Balance Procedure:
1. Open EST (Engine Service Tool)
2. Connect to the engine
3. Go to Test/ KOER Test/ Cylinder Balance
4. Start the Engine and allow the Cylinder (x) Crankshaft Angular Velocity Data Values to stabilize.
5. Slowly accelerate the engine up to 1500 rpm keeping Actual Engine Torque (#2 in example below) below 150 lb/ft. Run engine at 1500 RPM for 5 min.
6. Referencing the values (#1 in example below). Locate the Cylinder(s) that are running outside or higher than the rest.
Example:
• Cylinder 1 – Value: 0.7
• Cylinder 2 – Value: -0.1

• Cylinder 3 – Value: -0.2
• Cylinder 4 – Value: -0.2
• Cylinder 5 – Value: -0.2
• Cylinder 6 – Value: -0.2
Cylinder 1 is reading the highest and is not consistent with the other 5 cylinders. Therefore, this cylinder is suspect for the fault.

WARRANTY INFORMATION
Warranty Claim Coding:

Standard Repair Times:

 

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