Hi Everyone,

I had my scanner plugged in and decided to take a drive to see some real time data. I noticed my Bank 1 VCT did not move. It was +/- .01 the whole drive. Bank 2 did move back and forth.

Is this normal? I would think it would advance/retard timing somewhat but nothing.

Thank you,

Ken

 

I say yes.

I have new both ford vct. They didn't the same . Mine both do.

I unplugged both and took a drive. Same thing.

I disabled them and same.

What's not normal is them not going back to their base position.

 

They should be moving in the same way relative to one another. See vids below.:

@ ~2:45 here:

@ ~1:20 here:

There's a real good Ford video that runs through how things should look and change over the duty cycle but I can't seem to find it now. Maybe someone else has a link.

 

I would have to ask "Just which OBDII parameter for the VCT's did you have your scanner set on. There are Three (3) for each bank that are 'calculated' by the PCM and output for scanners. One is Requested Retard (a value - in 'crankshaft' degrees) - that the PCM desires the cams to be Retarded to under instant driving conditions / load. Another is the % Duty Cycle that the PCM is outputing to the VCT Solenoids to supply exactly the right amount of oil to hydraulically cause phasers to adjust cams to the desired relationship with crankshaft. The final one is CAM ERROR. It is calculated in the PCM by taking the RETARD REQUESTED value and subtracting it from the ACTUAL cam angle it reads from the CPS (cam position sensors). The net result should be at or near ZERO if everything is working properly. If it isn't exactly zero, the PCM increases or decreases the %duty cyces to the Solenoid trying to get CAM ERROR to be ZERO. It sounds to me like THAT is the signal you were monitoring, and it should (on a properly functioning Phaser) bounce positive and negative slightly - and promptly return to ZERO when the PCM changes the amount of desired Retard.

Hope this heps.

 

Thank you reallynice guy915

 

Thank you Mike A.

 

F150Torqued - It was the VCT Cam Error. Bank 2 was bouncing back and forth. I think it was like around 6 to -6 maybe. It was hard looking at it while I drove. I'll it on anther later today with all parameters.

Thank you.

 

F150Torqued - I finally was able to hook up the Autoscan and take it for a drive. The VCT on bank 1 barely moved at all on all 3 Pids but the bank 2 bounced all over the place. The advance had gone as high as 46 while the error not that high. The DC barely moved, it went to 1 or 2 rarely. Maybe VCT 2 is bad? These don't have many miles on it at all. I put them in right before I had to have my engine rebuilt.

Thank you,

Ken

 

Ken, we're still not communicating real well. I don't know any more than I did before. "The VCT on bank 1 barely moved at all on all 3 PIDs". If you are talking about RCAM, VCTDC1, and VCT1ERR - then maybe VCT 1 is bad. ==== I'm being facetious! RCAM (request cam retard) is a signal generated by the PCM - and VCTDC is an output signal from the PCM. If they don't do anything - then the cam is not supposed to do anything,and THUS - if the cam didn't do anything stupid - then there would be no CAMERROR. Problem with that theory is the PCM is not going to command retard on bank 2 and NOT on bank 1.

 

F150Torqued - I'm sorry. I should have explained better. The 3 PIDs are:

VCT Advance
VCT Error
VCT Duty Cycle

For Bank 1 they barely moved at all. I don't think the advance moved at all. The error 1-2 and the duty cycle 1-2
For Bank 2 the advance went as high as 46. The error not that high, maybe 7-8 and the duty cycle 1-2.

I'm assuming maybe one of them are bad? These were new in my engine before I had to have it rebuilt.

Thank you,

Ken