WGFV and air leak problems.

Shayne thequattroking at yahoo.com
Tue Apr 8 01:47:29 EDT 2003

See below


Shayne P.

Oakland, CA.

Tons 'o German junk.

FOR SALE:  1988 BMW 528e $3700
PARTING:  1972 Mercedes Benz 280 SE 4.5
> At 7:29 PM -0700 4/7/03, Shayne wrote:
>> I found a bunch of leaking air lines on the back of the motor.  Replaced
>> them.  Spent 2 more hours trying to find another leaking line.  The motor
>> would not hold a vacuum.  I can hear another leak at the back of the head
>> but can't find it.  I was applying vac to the TVB vac line.  I individually
>> tested the small three vac lines on the back of the head.  Those are the TBV
>> line, and if memory serves me right, two heater vac lines.  I also tested
>> the ISV hoses, the associated intake hoses and anything else I could see.  I
>> am stumped.  Where else can it be leaking??  I can hear it (back lower part
>> of the head), but can't find it.  Even when testing each line individually.
> I developed a major leak on the intake pipe-> throttle body hose last
> summer.  Tore right at the indented part for the lip on the throttle
> body.

Checked that.  Air tight.

> I also developed a leak, loud enough to be heard with the engine
> idling and hood up, where the hard green ECU line goes underneath the
> fuel lines; the fuel lines chaffed a hole right through it.

Thanx.  Likely this is it.  Sounds as though it is coming for the general

> Lastly, did you double check all the pipe clamps for the ISV etc?

Sure did.  Good to go.

> By the way- pressure testing is a lot easier, because among other
> things, you can feel the air leaks(and there's a clear change in the
> noise when you get your fingers close.)  A 1-cup rubbermaid container
> and a compressor fitting will do the job nicely- remove the intake
> hose off the end of the MAF and insert the bottom of the container,
> tighten the clamp, tada!  Just be careful not to overpressurize the
> system- the ECU pressure sensor could be damaged.  Don't go above 1.8
> bar indicated(sensor maxxes out at 2).  Recruit a friend to watch the
> display if necessary.

Thanx for the tip.  I like the container idea.

More information about the 200q20v mailing list