Hello to All,
I have a 2005 GC Limited 4.7 v8 with 142k. During the last 12 months, I've had issues with a rough start on a "warm" motor. Does not happen on a "cold" motor (sitting overnight), or a "hot" motor (stopping at 7-11 and restarting vehicle). Once the vehicle has sat for an hour or so, there is a hesitation when starting, and every once in a while, a "delayed" acceleration when pulling out of a parking space. There seems to be dozens of reasons why this could be going on.
Here is what I've done over the past 12 months:
Plugs, coils, fuel injectors, egr valve, iac, tps, cps, pcv, 02 sensors. Compression tested (fine). Fuel Pressure tested (59 psi).
When the CEL comes on, it is always either P0306 or P0308 - and sometimes both. The scanner shows the LTFT Bank 1 at 2.3, and the LTFT Bank 2 at 8.5. Bank 2 is always much higher than Bank 1. And Bank 2 is where #6 and #8 cylinders are of course.
Any suggestions of what else I could do? Can anyone tell me what the LTFT readings are with normal operation?
Any help is always appreciated.
I have a 2005 GC Limited 4.7 v8 with 142k. During the last 12 months, I've had issues with a rough start on a "warm" motor. Does not happen on a "cold" motor (sitting overnight), or a "hot" motor (stopping at 7-11 and restarting vehicle). Once the vehicle has sat for an hour or so, there is a hesitation when starting, and every once in a while, a "delayed" acceleration when pulling out of a parking space. There seems to be dozens of reasons why this could be going on.
Here is what I've done over the past 12 months:
Plugs, coils, fuel injectors, egr valve, iac, tps, cps, pcv, 02 sensors. Compression tested (fine). Fuel Pressure tested (59 psi).
When the CEL comes on, it is always either P0306 or P0308 - and sometimes both. The scanner shows the LTFT Bank 1 at 2.3, and the LTFT Bank 2 at 8.5. Bank 2 is always much higher than Bank 1. And Bank 2 is where #6 and #8 cylinders are of course.
Any suggestions of what else I could do? Can anyone tell me what the LTFT readings are with normal operation?
Any help is always appreciated.
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