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  1. E46 General
    Hey guys I have a 2002 320ci and i recently had a massive loss of power and my feuld economy got up to 15L/100k. There is a rather loud air leaking sound coming from around my disa valve. I have replaced the DISA o ring and my lower and upper intake boot. I cannot seem to find a vacuume leak...
  2. E46 General
    I've had no troubles with my 2002 330i with a manual transmission until 2 days before my appointment for a NY state inspection. The CEL came on and there are P0171, P0174 and P1620 codes. The 1620 code almost certainly seems to be caused by a 2-year old thermostat. Coolant was down about 10...
  3. E46 General
    So I took the heat shield off between the engine and brake booster to look for a leak behind/under the intake manifold. I replaced one vacuum cap there two or three years ago and I'm wondering if I might have missed one. Some sources say there should be two but I can only find one. If...
  4. E46 General
    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...
  5. E46 General
    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?
  6. E46 General
    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...
  7. E46 General
    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...
  8. E46 General
    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...
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