You know your words have been ringing in my head since you said it. I just knew that the shop KNEW what was the problem and stopped it anticipating the repair. A few days before the repair appt. I started it to make sure it starts and with the scanner plugged in it showed the rail pressure going much higher than before in the shop. I think the highest he got was 9-11k and revving it I could get into the high teens. I took it for a drive around the block and got it to 21k by getting on it. I emailed the tech to ask if CP3 problems could be intermittent and he said not to his knowledge and that low rail pressure has a multitude of possible causes and I continue to drive it and monitor the values. First thing planned is a new fuel filter even though the OEM one looks recent and so does the whole filter head assembly.
Thanks for the insight.
ronfisherman wrote:
rowekmr wrote:
Update is it needs a new grille, fog light and front bumper (slightly twisted) checked out by a licensed rebuilder. For the P0087 code (low fuel rail pressure) a Duramax specialty shop diagnosed bad CP3 pump after plugging it up and going through several test. It also has power steering pump/power booster issue that will be addressed while in the shop for the CP3 pump. Even with low pressure it drives pretty peppy a lot more quieter than the 6.0L's I'm used to but I stopped driving it until it is fixed.
There are some good test for checking out a CP3 pump. But if fuel filter has not been changed the tests mean nothing. If you have not found Deisel Place yet. You will find lots of information on all the Duramax's.
