The owner has said the problem is intermitant but becoming more frequent.
The engine seems to stutter while accelerating from a stop light. Once the rpms come up it seems ok. It does it more frequent with fuel level below 1/3. The fuel pump seems pretty loud. The pressure reads 52 at idle. When you accelerate either standing still or driving, it moves up to 60 psi momentarily and drops back to 52. If you let off the throttle it drops to 52 right away. The book says it should be 60 to 66. Is there a fudge factor? Or absolutely not, 60 to 66 is where it has to be. I have used two different gages and both read the same. I changed the fuel filter and rechecked pressure. No difference.
At one point I was able to get it to stumble while in neutral. The gage was at a fairly steady 52 psi.
I also removed the EGR valve to check for obstacles. It looked ok.
It is a 5.7L CSFI.
The intake manifold was very recently resealed due to a coolant leak at the drivers side front coolant cross-over. It has not changed the stutter issue
No check engine light.
Monday, January 6th, 2020 AT 9:54 AM