I am prepping for a trip from upstate New York to Boston. Took a test run early this morning after replacing the fuel pressure regulator or shimming the fuel pressure relief valve.
They weren’t done at the same time. I had a hard start a few months ago and shimmed the fuel pressure relief valve and fixed that issue.
Then the truck started showing a loping idle which reliably stalls at 2k RPM.
So replaced the fuel pressure regulator last night.
It ran like a top on the 20 mile drive. No symptoms really to speak of that I can see or hear. I did notice last night, after reading scan data, after we got the fuel pressure regulator in, that fuel rail pressure actual dipped to zero quickly and then back up to 5600 psi. But the truck maybe missed a beat that was it. It idled for a full hour no problem. I assume that the problem was solved. As it would not idle more than a minute.
This is exactly the way it happened last week. Truck ran great over to radio station to pick up some free tickets, went to dinner. Came back to the truck it started, idled, and quit after a few seconds.
Then after that I could start it and it would idle but as I opened the throttle to 2kRPM, it would stall.
Putting the truck in gear also causes a stall.
Fuel rail pressure commanded percent was out of spec before Amy replaced the FRP. After the replacement it was back in spec—about 37%. After my laptop charges, I will go out and see what that commanded percentage is again. It looks like, with the little scanner, it is again low.
They weren’t done at the same time. I had a hard start a few months ago and shimmed the fuel pressure relief valve and fixed that issue.
Then the truck started showing a loping idle which reliably stalls at 2k RPM.
So replaced the fuel pressure regulator last night.
It ran like a top on the 20 mile drive. No symptoms really to speak of that I can see or hear. I did notice last night, after reading scan data, after we got the fuel pressure regulator in, that fuel rail pressure actual dipped to zero quickly and then back up to 5600 psi. But the truck maybe missed a beat that was it. It idled for a full hour no problem. I assume that the problem was solved. As it would not idle more than a minute.
This is exactly the way it happened last week. Truck ran great over to radio station to pick up some free tickets, went to dinner. Came back to the truck it started, idled, and quit after a few seconds.
Then after that I could start it and it would idle but as I opened the throttle to 2kRPM, it would stall.
Putting the truck in gear also causes a stall.
Fuel rail pressure commanded percent was out of spec before Amy replaced the FRP. After the replacement it was back in spec—about 37%. After my laptop charges, I will go out and see what that commanded percentage is again. It looks like, with the little scanner, it is again low.
