I'm willing to bet the brake vacuum switch is failing and causing the leak. It is attached to the brake booster and has two other vacuum lines coming off of it. We sell these like crazy, it is part number 30620958 for ch#685754- and up.

Hi my S40 chassis number is 001482 for 2003 S40 with B4204T4 ...

I'm willing to bet the brake vacuum switch is failing and causing the leak. It is attached to the brake booster and has two other vacuum lines coming off of it. We sell these like crazy, it is part number 30620958 for ch#685754- and up.

Hi my S40 chassis number is 001483 for 2003 S40 with B4204T4 ...

Problem was with intake hose. This hose is about 2" in diameter and is connected to air filter assembly. PCB containing sensor circuitary is located inside this hose. After replacing this hose with PCB, everything works fine. Thanks for all the suggestions.

My mechanic does not think it is ECM. He thought it is throttle body but replacing it did not resolve the problem. Vacuum lines are OK. He is still looking for problem.

How are your spark plugs? Air filter?

Check vacuum lines -- small diameter hard plastic tubes, and their elbows.

Recently changed spark plug. Air filter clean. I don't see anything unusual wrong with vacuum lines and no hissing(spell??) sound.

I just dropped car to my mechanics. Will see what ...

How are your spark plugs? Air filter?

Check vacuum lines -- small diameter hard plastic tubes, and their elbows.

Recently changed spark plug. Air filter clean. I don't see anything unusual wrong with vacuum lines and no hissing(spell??) sound.

I just dropped car to my mechanics. Will see what ...

Hello,

Yesterday I got check engine light and car stopped. I tried to turn back on it starts and immediately stops. When it starts and I accelerate little immediately then it runs and I can drive as long as I don't take my foot off the accelerator paddle.

I got following check engine codes ...