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VW MKIII-A3/B4 TDIs This is a discussion about MKIII-A3/MkIII Jetta/Golf (<99.5) and B4 Passats (96,97) TDI's. Non TDI related postings will be moved or removed.

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Old August 15th, 2017, 07:29   #16
JETaah
 
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You are right...intake manifold in your case.
So much smarter to make the EGR a separate part.
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Old August 15th, 2017, 07:33   #17
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Thanks!
EGR is easy to block also. Removed one metal pipe between the valve and the exhaust manifold, blanking plates on both ends, and voila, done! EGR still operates, so no codes
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Old August 15th, 2017, 08:03   #18
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I've adjusted my diagram to reflect the remarks.
One more question, if the intercooler pipe/intake goes to the ECU, doesn't it clog the ECU sensor with dirt/oil?
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Old August 15th, 2017, 11:02   #19
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It can transfer intake oil if there is a leak in the ECU hose as there quite often is. If there isn't then it is a lesser concern because it just compresses a column of boosted air in the hose....no significant flow.
The turbo to N75 to wastegate hoses do fill with intake oil and that becomes more of a clogging issue. Gravity helps the oil residue make it's way to the wastegate actuator being that it is the lowest component in the control system.
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Old August 15th, 2017, 11:04   #20
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Quote:
Originally Posted by lisab4 View Post
I've adjusted my diagram to reflect the remarks.
One more question, if the intercooler pipe/intake goes to the ECU, doesn't it clog the ECU sensor with dirt/oil?
Unless there's a leak nothing actually travels through the hose. There may be a tiny bit of ingress where the hose meets the intake but oil etc shouldn't find its way more than an inch up the tube, if that. The same column of air stays in there getting squished with pressure then springing back.

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Old August 15th, 2017, 11:26   #21
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If you are concerned about oil migration ( I had quite a bit of accumulated oil in my WG actuator) then install a "drip leg" to catch the oil.

Common in natural gas piping to install a redundant leg to catch water and prevent it from entering into sensitive equipment.
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Old August 15th, 2017, 15:45   #22
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Thanks guys!
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Old August 15th, 2017, 17:38   #23
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FWIW the wastegate actuator has a fair bit of volume to fill, hence the oil migrating through the pressure line. The MAP sensor on the other hand has virtually none.

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