WGFV and air leak problems.
thequattroking at yahoo.com
Tue Apr 8 01:47:29 EDT 2003
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
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.
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