For 1990-2009 cars

# Bi-Phase LPG system on 03-08 Chev GMC GMT560 with 8.1L Engine - keywords backfire diagnostics driveability fuel intake

Subject: | Bi-Phase LPG system on 03- 08 Chev GMC GMT560 with 8.1L Engine

Models: | 2003- 2008 Chevrolet GMC GMT560

| with 8.1L Engine (Bi-Phase directed injected LPG system)

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

### Condition/Concern:

Concerns wtih 2003- 2008 Chevrolet GMC C4 C5 C6 C7 C8 with 8.1L Engine Bi-Phase directed injected LPG system

### Recommendation/Instructions:

GM does not produce or support the BI-PHASE directed injected LPG system. For assistance please contact Bi-Phase at PH 888-465-0571.

Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.