Hey again, I’m getting the regular vac leak codes from p085 to p0171/4, I replace both lower and upper intake boots and replaced the disa valve o-ring. no rough idle, only a slight bouncing idle ranges from 700-800 rpms, the car seems to be running perfectly fine. I don’t know where the leak is...

I Have a small hole/wear in my block where the air intake connects caused by a screw that was too long. Can this be repaired? Will this cause a vacuum leak? What should I do?

Just had the check engine light come on in my 02 325 XI and had it plugged in at autozone . 2 codes came up . 1.) P0492 secondary air injection system (bank 2) 2.) P0491 secondary air injection system (bank 1 ) The code reader recommended that the likely solution is the replace the smog pump...

This thread is intended to help other newbies with things I learned in chasing down vac leaks over the past couple weeks on my 04 325 coupe late production M54 engine - the one that does not have the secondary air pump attached to the intake manifold. Those of you who are much more experienced...

If you are experiencing any of the aforementioned, and believe you have a vac leak save yourself a bit of time. You don't have a ton of vac lines, BUT your E46 M52/54 engine has plenty of spots to let air in wreaking havoc on your car's performance and your brain. Check the following: 1. DISA...