Engine Frustration - Help!

[f-wolf]

JordyG

I send you a Message. See how you go with it. Let us know if it works.

Reset the cam phasers

1). Turn ignition to ON

2). Hold foot all the way to floor on accelerator.

3). Turn key as if to start.

4). Dont worry car wont start as sensor on accelerator knows you are flooring it.

5). Hold key like this and count to ten. During this time the starter motor will be going - dont worry this is normal

6). Turn key back to OFF.

7). Take foot off accelerator.

. Wait 30 seconds then start as normal

This resets the cam phasers...

Variable Cam Timing System

The Barra I6 engines are fitted with dual equal variable cam timing system. There is one Variable Cam Timing Actuator per camshaft; the cam timing is variable between -10° and 50° of crankshaft rotation.

Modes of Operation

Start Up / Idle Mode:

At start up and during idle, the Actuators (phasers) are locked in the fully advanced position. A hydraulic locking pin within the Actuators will lock the camshafts manually.

(Duty Cycle is 0%)

When the throttle is opened and engine speed exceeds 1000 RPM, Drive Mode is initiated

Drive Mode:

The Drive Mode starts at different RPM points, dependant upon Engine Oil Temperature. The PCM actuates the Variable Cam Timing Solenoids through a 20% to 80% duty cycle. This allows oil under pressure to operate the Variable Cam Timing Actuators.

The PCM monitors the Camshaft Position Sensors for actual cam timing (closed loop), it will adjust the duty cycle to the Solenoids individually to achieve the desired cam timing.

Shut Down Mode:

When the engine is shut down, the Actuators return to the fully advanced position, a hydraulic locking pin within the Actuators lock the camshafts manually.

Failure Mode:

Should any of the sensors required for variable cam timing operation fail, Failure Mode is initiated.

The duty cycle of the Solenoids is set at 0%.

The hydraulic locking pin within the Actuators will lock the camshafts into the fully advanced position.

Variable Cam Timing Actuators

The Variable Cam Timing Actuators (phasers) are incorporate into the camshaft drive sprockets; they should not be dis-assembled from the camshaft sprockets as they are serviced as an assembly. They are operated by the Variable Cam Timing Solenoids

There are 5 holes on the rear face of the Variable Cam Timing Actuators, one is for the locating dowel and the other four are for advance oil supply. The retard oil supply is through the centre of the unit

Edited 14/06/13 10:10 AM by Dagabond

[dustyae86]

NO NO NO!!! did this happen to do it after it saw a bit of boost and you jumped off the throttle?

My car is one of the cars that mick is talking about, it jumped 2 teeth on the timing chain and sounded the same, but my phasers were also bottoming out making it sound scary.

get it fixed as soon as you can.

Expect close to a grand to fix if it's not done any damage.

[JordyG]

Yep not long after giving it a squirt.

But its definitely not making any scary sounds.. hopfully no damage is done.

It sounds exactly like it has gone into failure mode.

So it looks like il be up for a cam timing sensor.

[ratter]

no, do not replace that sensor with out testing it, they are not normally an issue.

[JordyG]

No I sure wont be doing anything myself.

It will be going back into another shop Tuesday. The guy that runs this one apparently knows his stuff. So looking forward to some light being shed

Edited 09/06/13 11:55 AM by JordyG

[FPV TRANNY]

keep us informed mate and hope all is fixed.

[MikeT36]

Variable Cam Timing System

The Barra I6 engines are fitted with dual equal variable cam timing system. There is one Variable Cam Timing Actuator per camshaft; the cam timing is variable between -10° and 50° of crankshaft rotation.

50° of Advance timing?? that's insane

[Ralph Wiggum]

50deg of crankshaft rotation so only 25deg of cam advance

[MikeT36]

oh with you now sounds more reasonable I though 50°was to good to be true yet alone usable

[dustyae86]

will bet money that it has jumped a tooth or two