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(SOLVED) Weird fuel pressure symptoms
Anyways the problem was the FPR… with the FPR pulled out I noticed when plugged in with the ignition on it wasn’t making a “buzzing” sound that good FPR would make. I would like to make a special thanks to my viewers for staying with me on this dramatic/mystery event. That concludes this...- PressPause
- Post #18
- Forum: LLY
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(SOLVED) Weird fuel pressure symptoms
Oh it Showed max pressure with it unplugged but my diagnosis method ended up tricking me. The pressure regulator was stuck at 9000psi. With the pressure sensor disconnected my tech2 gave me the illusion that I was controlling the “pressure” but it was controlling something else that was...- PressPause
- Post #17
- Forum: LLY
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(SOLVED) Weird fuel pressure symptoms
That’s exactly what I was thinking. But there must be another variable that’s being controlled fuel wise in order to change the tone of the engine while the pressure is being modified. When I first played around with my tech 2 with another Duramax I played around with the fuel pressure and when...- PressPause
- Post #12
- Forum: LLY
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(SOLVED) Weird fuel pressure symptoms
alright so I’m pretty dumb… my diagnosis process was even worse. For the first time I had both the sensor and the fpr unplugged and the pressure was still able to be adjusted… the FPR is just probably stuck.- PressPause
- Post #10
- Forum: LLY
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(SOLVED) Weird fuel pressure symptoms
My only code is P0089 With my sensor plugged in the idle psi fluctuates between 8000-9000 and cannot be modified with the tech 2- PressPause
- Post #8
- Forum: LLY
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(SOLVED) Weird fuel pressure symptoms
You can hear it in the attached YouTube video The sound of the motor and the quality of the idle changes as the desired pressure is adjusted.- PressPause
- Post #5
- Forum: LLY
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(SOLVED) Weird fuel pressure symptoms
But wouldn’t it not be able to move at all? I can adjust the pressure with my tech 2 if the pressure sensor is unplugged.- PressPause
- Post #3
- Forum: LLY
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(SOLVED) Weird fuel pressure symptoms
Alrighty here goes nothing… My idle fuel pressure is at 9,000 psi I have tried commanding it higher or lower with my tech 2 to no avail. I disconnect the FPR no change. If I disconnect the Fuel Rail Pressure Sensor I am then able to command a change of pressure with my tech 2. 2005 GMC Topkick...- PressPause
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- fpr frps fuel pressure fuel rail pressure regulator
- Replies: 20
- Forum: LLY