|
You didn't say why? This is a big topic with many causes.
The ECU compare the actual position of the cam shaft position sensor with the crank shaft sensor, to the relative position (where it should be). The difference is the cam position deviation.
The crank shaft turns the Intermediate shaft with a timing chain. The intermediate shaft turns bank 1 cams from the Intermediate shaft bearing end with a second chain, and the bank 2 cams from the more rigidly fixed oil pump end with a third chain. On the 2003 and newer each set of cams turn with one chain.
1. The IMS bearing failing can cause deviation. It could show more deviation on bank 1 than bank 2. This is because only the crank to IMS bearing displacement shows on Bank 2. While bank 1 adds displacement between the IMS and the cams and the crank and the IMS chain as the bearing deflect due to wear.
2. Chain tensioner or chain guide wear. This is likely be localize one side or the other but could be both with poor maintenance and high mileage.
3. A high deviation one bank and not the other. Cam position solenoid or intake cam adjuster
__________________
2003 Black 986. modified for Advanced level HPDE and open track days.
* 3.6L LN block, 06 heads, Carrillo H rods, IDP with 987 intake, Oil mods, LN IMS. * Spec II Clutch, 3.2L S Spec P-P FW. * D2 shocks, GT3 arms & and links, Spacers front and rear * Weight reduced, No carpet, AC deleted, Remote PS pump, PS pump deleted. Recaro Pole position seats, Brey crouse ext. 5 point harness, NHP sport exhaust
|