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That good news for now.
Decide if you want to revisit soon or replace Bk1In now and be done!
Perhaps Bk-1 was worked on and owner got tired of all the milkin'
Bk-1 has the worst job driving the dry HPFP... it goes first.
So now I need to replace that b2 vvt gear.. could this be causing the misfire as well? I guess I’ll tackle the job, any idea of parts needed so I can order before doing anything?
So now I need to replace that b2 vvt gear.. could this be causing the misfire as well?
I guess I’ll tackle the job, any idea of parts needed so I can order before doing anything?
Here is your part list:
VVT intake gear(s)
Tensioners B1+B2 (diff. PN)
fasteners kit with RTV
4X CPS.
4x CPS pigtails
4x VVT-Solenoid pigtails
...
Last edited by CaliBenzDriver; Oct 25, 2024 at 03:29 PM.
This may be helpful. On my C350 with the M276 3.5L NA engine, the Left Cylinder Bank (Bank #2) IntakeCamshaft is actually near the upper limit for its position. It's still within boundaries, but barely. Still, the car runs fine.
JR! thank you for this interesting live screen cap.
I think your B1Intake is unlocked and ECU has barely enough pressure to drive HPFP with timely positioned camshaft.
Meaning you're in-between in an already improved spot!
Enough pressure to not chew the lock pin all the time and not a whole lot to drive the dry HPFP hard pump shaft.
At any rate, being unlocked you are on the virtuous end towards smother pressure without jerky steps.
We have a lot to learn on experimental journey. Better viscosity is the winner for hydraulics.
Last edited by CaliBenzDriver; Oct 25, 2024 at 07:32 PM.
I just put the cam adjuster in but not very confident in timing. Everything seems to line up but I tightened the tensioner and noticed the crank moved a little past 40 degrees. I turned the crank a few times and the timing marks are still in the same position. How does it look to you guys?
the marks are ligned up +/- 1 tooth from crank position - - It must be right but is about 1/8" exact... VVT Gears timing marks
Your valves cleared during 1st initial turn
Bk1: I honestly don't see marks...
Last edited by CaliBenzDriver; Oct 28, 2024 at 03:50 PM.
the marks are ligned up +/- 1 tooth from crank position - - It must be right but is about 1/8" exact... VVT Gears timing marks
Your valves cleared during 1st revolution
I just put the cam adjuster in but not very confident in timing. Everything seems to line up but I tightened the tensioner and noticed the crank moved a little past 40 degrees. I turned the crank a few times and the timing marks are still in the same position. How does it look to you guys?
Q: did you take a photo of the camshaft w/o the gear? To see if the laser marks of the tone wheel were aligned with the cam?
You know camshaft can get forced by valves... you had chain tension released during intake gear out... I think your exhaust camshaft walked fwd (that's exactly why engine needs new tensioners not limping!)
Go to town on your Bk2 timing marks.
I think exhaust should point at the nearby tensioner nut, right?
🤞
Last edited by CaliBenzDriver; Oct 28, 2024 at 05:56 PM.
You know camshaft can get forced by valves... you had chain tension released during intake gear out... I think your exhaust camshaft walked fwd (that's exactly why engine needs strong tensioners not limped!)
Go to town on your Bk2 timing marks.
I think exhaust should point at the nearby tensioner nut, right?
🤞
It seems timed for Bk1, i.e. pointing to the opposite bolt of the chain tensioner.
So your known good Cyl.1 has an excuse to misfire on lean mixtures.
Did your camshafts get timed well?
Still no extra faults, just Cyl.1 right?
At this point, I'd check timing through CPS ports.
This will validate that Bk2 reluctor and 4x VVT are all on cue.
Previous shop went after in-tank fuel pump when job was VVT and we can guess 95% chance they only did Bk1 because Bk2 was still failed. Bank1 looked out of time.
Last edited by CaliBenzDriver; Oct 28, 2024 at 07:18 PM.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
