Ford Repair Questions? Ask a Mechanic for Answers ASAP
It ran rough after idling with the air conditioner on. The day was very hot, 109 degrees. After increasing the RPM and driving a short distance it seemed to smooth out and run fine. I have had intermittent rough running problems that always seem to clear up after increasing the RPM. This is the first time the check engine light came on.
These engines are notorious for phasers and VCT solenoids sticking for reasons other then the phaser itself. Cam sensor codes do not mean the sensors are bad. They can be set by any timing drive component that is making the valve timing incorrect due to over retarded or over advanced cam timing due to a sticking or inoperative phaser/VCT. The bad or sticking phaser or VCT solenoid is usually the result of the problem not the root cause. Here is a list of what I check or replace on these every time I get one in with phaser noise, VCT codes, cam sensor codes or misfires caused by VCT issues. Before any disassembly the PCM data pids for VCT error correction should be monitored to confirm it is a VCT issue. If the vehicle won’t run a compression test can also verify the VCT problem.
In short if I don't find oil pressure concerns and my cams are in good shape I usually replace the phasers, VCT bodies, oil pump and tensioners on every one of these. Ford has updated these part numbers several times with improved engineering designs.
Thanks for such a detailed answer. I did a little research and this seems to be a common problem that Ford is not dealing with. I only have 50,000 on this truck and so far it's a good driver but is not holding up. I also 1996 GMC with 250,000 and it seems more reliable than my Ford. Thanks again. I will click on accept answer.