2010 bmw 335i xdrive n54
So recently had my serpentine belt get eaten by the motor ruined the front main seal shut the car off before it did much else, replaced timing guides and both chains used torq specs from online sources used timing tool for cams QR facing up tdc cylinder 1 both cam tools fit pretensioned chain with tools that came with timing tools also put the pin into the fly wheel, both cam bolts new 20nm then 180 is what i found then i found another ones that said 47-48lbs also i put brand new turbos in with a custom tune but when i started it originally it sounded fine then it got bad, really rough idle you can hear it misfiring got the car warm and it sounded ok with a slight miss here and there i noticed when i logged my vanos req and vanos actual for exhaust was off intake was fine i readjusted timing since then and the values are really close now im wondering if the exh cam is slipping or if the vanos cam bolts get over torq can it cause this issue. timing seems to jump randomly.
Can lack of oil pressure cause this
LPFP seems to hit the 70-80 mark
HPFP seems to be fine startup sits at around 2500 at idle around 700
Full compression test all above 180psi
Tried new vanos solenoids
cam sensors
all new plugs and sparks good brand so two sets have been tried
flashed it back to stock to see if it was the tune tried other tunes etc
pulled valve cover to verify timing everything lines up
please any help would be appreciated im at the point where i will be pulling the valve cover again just to check timing and retorq cams
So recently had my serpentine belt get eaten by the motor ruined the front main seal shut the car off before it did much else, replaced timing guides and both chains used torq specs from online sources used timing tool for cams QR facing up tdc cylinder 1 both cam tools fit pretensioned chain with tools that came with timing tools also put the pin into the fly wheel, both cam bolts new 20nm then 180 is what i found then i found another ones that said 47-48lbs also i put brand new turbos in with a custom tune but when i started it originally it sounded fine then it got bad, really rough idle you can hear it misfiring got the car warm and it sounded ok with a slight miss here and there i noticed when i logged my vanos req and vanos actual for exhaust was off intake was fine i readjusted timing since then and the values are really close now im wondering if the exh cam is slipping or if the vanos cam bolts get over torq can it cause this issue. timing seems to jump randomly.
Can lack of oil pressure cause this
LPFP seems to hit the 70-80 mark
HPFP seems to be fine startup sits at around 2500 at idle around 700
Full compression test all above 180psi
Tried new vanos solenoids
cam sensors
all new plugs and sparks good brand so two sets have been tried
flashed it back to stock to see if it was the tune tried other tunes etc
pulled valve cover to verify timing everything lines up
please any help would be appreciated im at the point where i will be pulling the valve cover again just to check timing and retorq cams
Last edited:
