Intake Cam Timing advanced 20 Degrees at IDLE
 

Hey guys, as the title asks, how do I go about checking the AVCS timing? Can it be adjusted ?

My car has the intake cam advanced 20degrees at idle :-S

Would truly appreciate anyone helpglglglgl

How are you measuring that it's 20 degrees at idle? If it's via logging, what are you using? Which bank etc? Same on both? Does it noticeably feel different as it should? It would also likely throw a CEL.

Does it move around if you use the accelerator?

I'm doing a idling datalog through ECUTEK for my tuner.

When he go it the first thing he noticed was that the INTAKE cam is at advanced 20 degrees :-/

No engine light ever cam on, and that the weird part

it jumps around when u touch the throttle, but it stays in that particular region, while the others stick around -0 - 1

I think also it was on the left head, I'll have to back check if it's both headsgl

bump! need some help guys.


cant figure out what is causing this up to now. car wont idle on its own even.




it also sounds like a extreme unequal length header, meaning missing badly.

As Kodename47 said weird it not throwing and CEL codes and CEL light


AFAIK cams should all be at 0 at idle.


If just one is reading 20 then its possible that cam sensor is bad. but should throw code due correlation error.


If its now idling like crap mabe the cam actuator is stuck, but again you would expect cel codes/light.


mabe look through these TSB


11-130-13R : Difficulty Starting, Rough Idle, Cam Position, Misfire
http://www.ft86club.com/forums/attac...1&d=1375302652


02-132-12 : DTCs Relating to the AVCS (Active Valve Control System)
http://www.ft86club.com/forums/attac...0&d=1352490977

You have a JDL kit correct? I am running their kit and the downpipe touches my passenger side Cam Angle Sensor. Lots of others have had this issue, I've wrapped it in a loom and heat tape. Perhaps this could be a culprit?

I too thought it could be the cam solenoids, so I swapped the intake cam solenoids to see if it would move the problem over to the other head, but the issue is still on the left head. Same exact outcome


I will definitely read through the TSB's... I'm taking any advice that comes to me at this point

Yes I do have the JDL kit, I did notice that the down pipe runs rather close to that sensor so I did to a little Fab, but the issue is on the other head

Have you had the timing chain off of the car?


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What is the tune commanding?

Yes I just did a complete engine rebuild, changed rods, pistons, valves, springs and retainers

Not sure, I am doing F&G with delicious

haha, that changes things :-).


Still strange the ECU doesn't complain if its commanding zero and the sensor reads 20, that's assuming that's whats happening.

Yup! Same thing we all are thinking :-S

No codes makes it so much harder