[Bours]

well my indy is inspecting the car after i did a pull on ps2 at 19 psi ( logs look clean) ( first day after i pick up the car ) and i got these codes. plug 1 was melted and cam sproket was off. hes changing the hub. the tensioner . plugs and cam sprokets and hopes it fixes it..


compression is 75 psi on all 6 cylinders so he thinks valves are ok and not bent but not fully opened cause of timing off....

thoughts ?


UPDATE : it was a slippy tensionner, spun hub and broken cam sprokets !! Retimed engine and all is perfect !!! THANK YOU EVEYBODY !



FINAL UPDATE : ok here is exactly what happened. when i brought the car for timing chain issues i had a melted plug on cylinder no 1. indy was curious to why it happened....it made the chain skip and timing off


timing was fixed with new parts ( timing chain tensionner etc... ) After a 2 days i did a pull in 3rd gear from 2.5k rpm to 6.5k rpm and the log looked perfect but after i had rod knock noise.

i brought it back to indy and on cyl 1 there was a spun bearing and slightly bend rod ( metal shavings everywhere )



so originally i guess was my bearing was going out slowly on cyl 1

im gettin a rebuild by MMP ( forged rods and pistons with coated bearings.....)


the best used engine i could find was 75k miles and from a sketchy place. Im scared this engine would do the same too at my power level so im going with a nice rebuild....

lmk if you have any questions

[weehe126]

75psi is really low. If you got lucky and didn't hit the valves you will probably be fine.

[Bours]

Originally Posted by weehe126

75psi is really low

yea but its equal on all 6 cylinders....and i am able to start the car....then it dies off ....good sign no ?

[Pladi]

If you dont mind what oil were you using. Also weight brand and interval. Just curious.

The good thing here is that your compression is equal across all cylinders even though its very low.

[Pladi]

Originally Posted by Bours

yea but its equal on all 6 cylinders....and i am able to start the car....then it dies off ....good sign no ?

This seems like a variable timing issues and not a chain jump or something.

[Bours]

Originally Posted by Pladi

If you dont mind what oil were you using. Also weight brand and interval. Just curious.

The good thing here is that your compression is equal across all cylinders even though its very low.

yea its a good sign right thats its equal !?

liqui moly 5w-40 5k miles interval religiously

[Pladi]

Originally Posted by Bours

yea its a good sign right thats its equal !?

liqui moly 5w-40 5k miles interval religiously

Absolutely its a good sign. IT means that you dont have seal issues or ring issues or bent rods and such big problems.. I suspect the variable timing mechanism..which i believe relies heavily on oil pressure to operate.. Did you do a vanos bolt recall ?

[Pladi]

Originally Posted by Pladi

Absolutely its a good sign. IT means that you dont have seal issues or ring issues or bent rods and such big problems.. I suspect the variable timing mechanism..which i believe relies heavily on oil pressure to operate.. Did you do a vanos bolt recall ?

I would also not neglect sensor issues.. like cam sensor or crank..

[weehe126]

He said the actual timing was off, as in jumped timing. Oil and vanos would have nothing to do with this. It is a known issue with all N54, N55, S55 since they share the same hub.

If your mechanic did the compression test before fixing timing and the hub, maybe 75psi is fine. If he checked after then it is not fine.

[Bours]

Originally Posted by weehe126

He said the actual timing was off, as in jumped timing. Oil and vanos would have nothing to do with this. It is a known issue with all N54, N55, S55 since they share the same hub.

If your mechanic did the compression test before fixing timing and the hub, maybe 75psi is fine. If he checked after then it is not fine.

yea he did it before fixing it. he ordered the parts from germany ill know in 5 days....im anxious cant afford a new engine atm...

[Bours]

Originally Posted by Pladi

Absolutely its a good sign. IT means that you dont have seal issues or ring issues or bent rods and such big problems.. I suspect the variable timing mechanism..which i believe relies heavily on oil pressure to operate.. Did you do a vanos bolt recall ?

my particular car wasnt affected by the recall...he tried vanos solenoids and crank sensor but they were fine. then he looked at cam sprokets and they off by quarter of an inch

[Pladi]

Originally Posted by Bours

my particular car wasnt affected by the recall...he tried vanos solenoids and crank sensor but they were fine. then he looked at cam sprokets and they off by quarter of an inch

and your valves are ok ? wow thats crazy

[Bours]

Originally Posted by Pladi

and your valves are ok ? wow thats crazy

he doesnt know if they are ok...hes gotta to remove the head to check em....but since compression is equal on all cylinders he will fix cam sprokets. tensioner and hub then hopes it fixes everything.....

[bbnks2]

Originally Posted by Bours

he doesnt know if they are ok...hes gotta to remove the head to check em....but since compression is equal on all cylinders he will fix cam sprokets. tensioner and hub then hopes it fixes everything.....

[ignore this erroneous statement] There is piston to valve clearance...

[Bours]

Originally Posted by bbnks2

My intake valves are set to max lift at all times since valvetronic broke on me. There is piston to valve clearance...

What do you mean ? Valvetronic could be my issue ?

[Pladi]

Originally Posted by Bours

What do you mean ? Valvetronic could be my issue ?

thats so easy to test with ISTA hope to god your shop has done that test its like 70 vavletronic cycles..

[weehe126]

Testing valvetronic is irrelevant to his issue. Bbkns2 just stated it from a valve to piston clearance stand point. From what I have seen if that if you jump 2 teeth you should be fine. 3 and you are probably done.

[bbnks2]

Originally Posted by Bours

What do you mean ? Valvetronic could be my issue ?

No I am saying valves will not contact the piston.

[Bours]

Originally Posted by bbnks2

No I am saying valves will not contact the piston.

So they still could be bent??? My car starts rises to 2k rpm then dies...


Car wouldnt start if bent valves no ?

[Pladi]

Originally Posted by Bours

So they still could be bent??? My car starts rises to 2k rpm then dies...


Car wouldnt start if bent valves no ?

highly unlikely you have bent valves if i think about it again because of equal compression numbers..

But its likely that something is up with the vanos or valvetronic motor. Variable valve lift and variable valve timing control all valves at once.. which makes sense more than individual valve issues.. compression is the same..

[Bours]

Originally Posted by Pladi

highly unlikely you have bent valves if i think about it again because of equal compression numbers..

But its likely that something is up with the vanos or valvetronic motor. Variable valve lift and variable valve timing control all valves at once.. which makes sense more than individual valve issues.. compression is the same..

ah ok very interesting ! if the hub and sprokets doesnt work ill tell him to look at the valvetronic motor !

[Supra2k6]

i keep reading more and more hub issues as cars get older. Ridiculous design by Bmw to not key the crank and sprockets and rely on frictions discs, but at the same time lots or torque at low rpms isn't helping.