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i have 2 codes 11 and 21 bank 1 and 2 over advance
Were these codes present prior to the repair?
Not those exact codes, but there were codes pertaining to the vanos system
What would my best bet be to check valve timing? Do I absolutley need the special tools?
Yes, unfortunately, you WILL need the special tools to even check the camshaft timing.
There are a few places that sell these tools
Baum Tools, AST, Pelican Parts (you can google these names)
I know a shop that ordered the tool set off of ebay and they claimed they worked really well, for the cost (less than $200)
This X5 has the M62TU motor, if it helps in your search for tools
I suspect that the guide being broken, or the working around the chain with the guide removed may have let one of the chains slip.
This car will run of off a tooth, so you will need to check the cam timing to verify.
Since you also had codes prior to the repair, its possible that you may have a faulty or jammed vanos or solenoid.
But since both banks set codes (as you posted), I suspect a timing issue. I would definitely check that before digging into the VANOS assemblies.
Sorry I havent replied for a while, I do have 1 other question. If I get these tools to check the timing, will I be able to correct the valve timing by making a correction @ the camshafts ( move the chain via the cam spockets and not have to remove the lower timing chain cover etc..)