Had the tensioners, all the chains and gears in my 2000 s 4.o v8. Got the car back, seems to run like there's a miss. After driving a few miles check engine lite came on p1388. Used the Jaguar cam lock down. Now they say I need 2 cam shaft sprockets. They were just fine before the repair. Any ideas?

 

Ideas? A poor job by whoever did this work.

 

Not for sure but i think there are 2 different types of chains. Maybe mismatch. Chain to sprocket. Just a guess

 

P1388 VVT Over retarded – bank 2 possible causes.

Bank 2 VVT solenoid valve to PCM PWM drive circuit fault
Bank 2 VVT actuator oil supply fault
Bank 2 VVT actuator stuck

There are sealing rings (NNE2622BA) on the MODULE CARRIER for the oil supply to the V V Timing Unit.

They might be damaged or an oil change with a different viscosity might be the cause?

Could be that the VVT unit was not set correctly when the chains were installed/tightened? (set to full retard with special pin tool)

Could be, Could be, Could be, Could be, Could be?

Don't know, just guessing.

 

The chains and gears were bought in a kit. They changed the vvt. I heard that you need a crank lock down tool when you do this job?

 

Where BOTH the primary AND secondary tensioners replaced? The zip tie short cut method has caused big problems for other's!
Yes Jaguar wants the crank and cams locked down.
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Yes all chains and gears. All tensioners. I bought the Jaguar lock down kit no zip ties. Only thing not changed was the timing cam shaft sprocket as no problem before. New vvt.

 

As motorcarman said above, just guessing at this point.

Have the shop that did the work go back over what was done to make sure everything is set correctly.

Here is a link to the Engine Course:

https://www.dropbox.com/scl/fi/nfvwk...=ngq9rub7&dl=0

Pay particular attention to the section on pages 24 through 27 of the course pertaining to the Timing Chain and VVT Unit.

 

Thanks I have a better understanding how it works.

 

The engine course depicts the AJ26 engine management but the AJ28 EM has CONTINUOUSLY VARIABLE VVT instead of the 2 stage.

Other than that, they are very similar.

 

The shop says I need timing cam sprocket. No trouble before. They want to take it apart again. I'm not sure what's going on.