05 F-150 5.4L jerking on acceleration
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06-27-2013, 09:23 PM
Join Date: Jun 2013
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05 F-150 5.4L jerking on acceleration
Hey guys I'm new to the site.
I have been working on my 2005 f150 5.4l 4x4.Recently it has started jerking while acceleration a if it was missing on about half the cylinders. It is not drivable at this point. It seems fine until the truck gets to normal operating temp.
So far I have replaced the O2 sensors,both cam sensors,egr valve,plugs,accel coils and boots,fuel filter and maf sensor. I am about to pull my hair out. I have ran a fuel pressure test which came to 41psi with engine off and 39psi at idle. compression test brought 145-150 on every cylinder.i have check for vacuum leaks a million times and sprayed the intake with starting fluid checking for intake gasket leaks. It did not accelerate during the spray. Injectors have been replaced with new stock injectors. No mods to the truck at all. The only codes I have are p0171 and p0174(running lean bank 1 and 2).they only appear after the truck starts jerking. I can clear the codes and rev it all day long and they will not appear until its drove and starts jerking.The truck has 140k on miles. I am lost at this point.
Please help
I have been working on my 2005 f150 5.4l 4x4.Recently it has started jerking while acceleration a if it was missing on about half the cylinders. It is not drivable at this point. It seems fine until the truck gets to normal operating temp.
So far I have replaced the O2 sensors,both cam sensors,egr valve,plugs,accel coils and boots,fuel filter and maf sensor. I am about to pull my hair out. I have ran a fuel pressure test which came to 41psi with engine off and 39psi at idle. compression test brought 145-150 on every cylinder.i have check for vacuum leaks a million times and sprayed the intake with starting fluid checking for intake gasket leaks. It did not accelerate during the spray. Injectors have been replaced with new stock injectors. No mods to the truck at all. The only codes I have are p0171 and p0174(running lean bank 1 and 2).they only appear after the truck starts jerking. I can clear the codes and rev it all day long and they will not appear until its drove and starts jerking.The truck has 140k on miles. I am lost at this point.
Please help
