Quote:
Originally Posted by HDdave
Had been fighting bank 1 VANOS codes in my car since picking it up cheap a few months ago. Finally got everything else fixed enough that it is time to dive into the engine. Doing the full cooling system, all the drive belts and pulleys, valve covers, oil filter housing gasket, and throtte actuators all at once. Actually just pulled the crash bar off the front to make it nice and easy..
Here is what I found under bank 1 valve cover.. The intake is obviously different than the exhaust side. While I dont have a great understanding of how this one works yet, I rebuilt the vanos in my e46 a few years back so im somewhat competent with it. If you notice my ISTA screen shot, I did at one point when I first got this car have a code for both bank 1 vanos, but as of recent it was just the intake. Is this gear just stuck out? I mean I do think this car sat for quite some time.. I know e46's get sludged up and have issues because of that. Or should I be thinking about just ordering a remanufactured vanos adjuster? I have the timing tool, and did purchase stainless vanos spring caps and new bolts from NRW when I got the valve covers..
Just want to hear yalls thoughts before I tear into it too far over the weekend
edit- didnt realize that picture is so bad. Codes were 00275f vanos max limit position intake and the same thing for exhaust, 002760. The exhaust seems to have went away but still had the intake code at time of tear down.
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This is probably one of the more difficult VANOS issues to diagnose on the S65.
From what I've seen, the Vanos adjusters themselves rarely fail. More often, the problem ends up being one of the supporting components like the VANOS solenoids, O-rings, seals, or another issue affecting oil control.
The S65 also uses a relatively low-pressure VANOS system compared to the S85, so adjuster failures aren't nearly as common.
If the adjuster itself is at fault, I'd be more inclined to suspect debris or contamination causing it to stick rather than an outright mechanical failure.
As a first step, I'd swap the VANOS solenoids from bank to bank and see if the fault follows the solenoid. That's a quick, inexpensive test that can help narrow things down before replacing more expensive parts.