You really need to find out what your actual RP is. The RP sensor, which is on the top of the rail with the wire attached are known to fail, and can give false readings, telling the ECU one thing when it is actually getting the correct pressure from the CP3, causing your truck to throw that code, a rail pressure gauge will tell you if this is your issue or not. Or you could just swap out the sensor, they are not that expensive if you don't buy them from the dealership. Of course, just swapping parts does not guarantee that it will be fixed. If you do go for swapping parts I would go for the pressure sensor, followed by FCA, with the only other thing it could be last which would be your CP3.Thank you for the response. Code is P0088 Fuel Rail / System pressure Too high.
When you speak to Todd, tell him what is going on with you truck, he is one seriously helpful guy, and has probably forgotten more about our motors than most of us will ever know.OK, thank you for all the info. I will look up and call TC Diesel and see what he has. I was looking around for a shop type rail press guage but was not having much luck. I previously had a 2001.5 HO 6speed, lost my leg and had to get an auto. I had done gauges, exhaust brake and all kinds of stuff to the 01, but that's behind me. It's now an 05 auto. Thanks again for the help.
Not trying to start anything but I guess he made a mistake, we all do that from time to time. No reason to be condescending about it, you could have just said, "hey, fyi, this should be here, not in the 03/04 section.If you are posting this in regards to your 2005, then why was this posted in the 2003/2004 specific forum?
Please read EACH forum heading/title and post accordingly
The fuel control actuator (FCA) is located on the back of the cp3. It regulates how much fuel enters the cp3 from the lift pump thus regulating rail pressure. The relief valve is located on the fuel rail. Its job is to relieve or open if the rail pressure gets too high (around 25000 psi If I remember) and allows fuel to return to tank. This is a safety device and if cycled too many times can weaken and open at lower pressures.FCA Fuel Control Actuator? is that right? Is this the relief valve mentioned in other posts. If so where does this discharge to?