P0012, Trying to pinpoint the cause.
#1
P0012, Trying to pinpoint the cause.
Working on my 2005 f250 5.4L 3v.
Engine runs fine, revs up and sounds good. It has a slight miss when under acceleration. When I return from a drive the engine will stall as I coast into the driveway with the clutch pressed. When I start it back up the engine will thrash around and start the loud ticking from the pass side. I can give it fuel and rev up to around 1500 rpms and hold for a few seconds and the engine smooths out and returns to normal. I can make the engine go into this "thrashing" state by just turning the truck in the driveway. It seems that whenever the engine lugs that it has trouble recovering. I have just changed the timing chains and tensioners so I am sure it is nothing with that end. I do get the P0012 code and I am starting to suspect the phaser. I switched the vct solenoids around and the problem stayed with bank 1. I also tried driving the truck with both vct solenoids disconnected; It ran like crap but no stalling or thrashing. Would these be accurate tests to determine if the phaser is bad? Is there anything else that may cause this problem? Thanks
Engine runs fine, revs up and sounds good. It has a slight miss when under acceleration. When I return from a drive the engine will stall as I coast into the driveway with the clutch pressed. When I start it back up the engine will thrash around and start the loud ticking from the pass side. I can give it fuel and rev up to around 1500 rpms and hold for a few seconds and the engine smooths out and returns to normal. I can make the engine go into this "thrashing" state by just turning the truck in the driveway. It seems that whenever the engine lugs that it has trouble recovering. I have just changed the timing chains and tensioners so I am sure it is nothing with that end. I do get the P0012 code and I am starting to suspect the phaser. I switched the vct solenoids around and the problem stayed with bank 1. I also tried driving the truck with both vct solenoids disconnected; It ran like crap but no stalling or thrashing. Would these be accurate tests to determine if the phaser is bad? Is there anything else that may cause this problem? Thanks
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jtillery
1997-2006 Expedition & Navigator
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02-15-2014 01:49 PM