Quote:
Originally Posted by SG4247
Looks to me like both the cams are timed to each other correctly. To me that rules out phasers.
But both cams are not timed to the crank properly. It is off a little.
How can this be? Maybe main timing chain has stretch. Or the main chain tensioner is not taking up the chain slack, due to low oil pressure. At 50k miles my main chain and crank gear had significant wear. My car has been driven extremely hard, I could hear the chain noise on start up for a few seconds until oil pressure made the tensioner take up slack. I replaced the chain, gear, tensioner and galley gaskets and now that noise is gone. I never had any codes, just noise.
Has the front cover ever been off? Galley gaskets and seals replaced?
|
Thanks for the reply.
Do the cams look like they are timed correctly relative to each other?
According to the FSM image I posted, the first falling edge of the Bank 1 double pulse should be in sync with the first falling edge of the Bank 2 single pulse and
both of those falling edges should be in sync with the first falling edge of the crank pulse series. My timing shows a 3ms delay in Bank 1 relative to Bank 2.
In the post I linked to, my timing looks exactly like this image:
![](http://www.the370z.com/attachments/engine-drivetrain/139822d1576307706-p0340-img_2166_1.jpg style="width: 55vw; min-width: 330px;)
I makes me wonder if this is actually wrong. How did mine fail with the exact same timing problem? Could the FSM be incorrect, or not representative of relative timing? That seems hard to believe too!
I would love it to not be the phasers. I never heard any noise and the car ran perfect on my way home from work one night, then hit limp mode a few days later a mile down the road from my home after sitting for a few days. A mechanical timing malfunction would explain the scope shots (if the FSM is to be believed), but how??
To my knowledge, the engine has never been opened up. I got the car in 2014 with 25K miles and put ~50K miles on it since then. All daily driving with nothing too aggressive. Gallery gaskets were the first thing I came across and being an '09, its highly possible they need to be addressed. However, my oil pressure is still within spec.
One thing that I finally did was replace the battery. It was struggling and needed a jump if I didn't run the car for a few days. I replaced it tonight and fired it up to see if anything was different. I got a P0340 code for the first time. I cleared the codes and it hasn't come back yet. Not sure how a battery could influence that or if it was just coincidence? I also noticed that even after clearing the codes, I cannot rev the engine past 4500RPM. Im not sure of this is related to the timing or if the car is in a "re-learn" mode since the battery was removed and that is limiting it.
Re-reading the content in
THIS P0340 POST from @Knio, it seems like the exact issue I have with the same timing!