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Go Back   TDIClub Forums > TDI Model Specific Discussions Areas > VW MKIV-A4 TDIs (VE and PD)

VW MKIV-A4 TDIs (VE and PD) This is a general discussion about A4/MkIV Jetta (99.5-~2005), Golf(99.5-2006), and New Beetle(98-2006). Both VE and PD engines are covered here.

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Old October 28th, 2008, 15:23   #1
ymz
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Fuel Economy: 5.3 l/100 km (at 115 km/h)
Default ALH vacuum pump outlet loose

Symptoms: (very) occasional bouts of vacuum loss (once in a blue moon the brakes "disappear"... last week there was no boost for about 3 minutes... I could not duplicate any of these events at will...

I went to look at the vacuum system, and found that the hose coming from the pump was loose, so I proceeded to replace the clamp - and discovered that the outlet nipple was not fixed in place.

Is this normal or is it suppsed to be firmly in one position ???

Yuri.

Last edited by ymz; October 28th, 2008 at 15:28.
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Old October 28th, 2008, 16:52   #2
paramedick
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Yuri, the outlet on the vacuum pump normally rotates. Any other behavior is not normal.
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Old October 28th, 2008, 16:58   #3
ymz
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Yes, it rotates, but I could also "shake" it from side to side a bit...

Perhaps I'll see if I have some method of checking the amount of vacuum and try to shake it while reading... perhaps my Harbor Freight MityVac clone will do... if I can find an adapter...

Yuri.
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Old October 28th, 2008, 19:28   #4
Canadian_Grizzly
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Yuri its normal...keep looking for other causes.
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Old November 1st, 2008, 08:40   #5
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Hey Yuri, i have a vaccuum pump and line from my old engine if you need to replace it. It rotates, but should be fairly tight, without much side movement.

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Old November 1st, 2008, 09:03   #6
ymz
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Thanks! I've been too busy even to leave the house to test out the system...

I'll keep this in mind...

All the best,

Yuri.
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Old November 5th, 2008, 13:58   #7
morenc00
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I have a similar problem on my 01 tdi with high mileage, sometimes the brake pedal is harder, sometimes there is no boost and sometimes the anti-shudder valve does not activate when I shut down the engine. I also noticed that my fitting on the vacuum pump is pretty loose (sideways movement). I just made few phone calls and discovered the vacuum pump is not cheap 280$ cnd + tax and not readily available. I also looked at tdiparts.com and they sell the vacuum line and the vacuum reservoir not the pump I guess it's usually the reservoir or line that fails.

I will need to check if it's the problem in my case
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