BMW E46 330i Sportspack FL Cracked OFH & Poor Performance

alucard

New member
Just a quick update. I discovered my MAF is having issues.

On cold start ups I get rough idle, no stalls though. Unplugged the unit, smooth idle apart from higher idle before it settles a bit lower.

Took out the MAF an blew it out with air compressor at very low pressure. Its alot beter now but still not 100% sorted. Decided I will have a go with MAF cleaner. Any of you guys tried and had long term success with MAF cleaner?

Then I also noticed a intermittent rattle upon acceleration between 1800 & 2500 RPM. Thinking this might be the VANOS but not sure. The previous owner couldn't tell me what oil was previously used so I ended up buying 5W30 Castrol Magnatec. Can a Oil change/Thinner oil cause the VANOS to rattle? Didn't rattle before oil change.
 

alucard

New member
Just realized I never gave feedback/final resolution on this thread.

Turned out to be the sump breather hose (going down from the oil separator/CCV (Crank Case Vent Valve)) which had a tear in it . Created a vacuum leak.

Replaced the hose and then power,idle & startup was restored.

The original hose & connector was very brittle.



The rattle I heard was an exhaust manifold bracket near the bottom next to the sump. So that's sorted as well and wasn't VANOS (thank goodness).

Thank you everyone for your input! :ty:

Kind Regards
 
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