The vacuum opens the valve. The valve's default position is shut. Your symptoms sound very similar to the time my solenoid valve malfuntioned and sent a constant vacuum to the valve and keeping it in an open position. If you're having a problem with the vacuum pipe disconnected that goes away when the pipe is connected i'd have to say i would be pretty stumped too.
Why dont you try taking the egr valve off and checking it visually to see if it is sticking open and giving it a clean.
No power! please help :-(
Moderator: Moderators
Re: No power! please help :-(
just rev the car alittle whilst looking at the egr valve,
you will see it open and close, they make a hissing noise if there not closing properly,
if its stuck open ithink your car wouid smoke abit
you will see it open and close, they make a hissing noise if there not closing properly,
if its stuck open ithink your car wouid smoke abit
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madmadmax
- 2.0 Turbo
- Posts: 484
- Joined: Sun Jan 01, 2012 5:49 pm
- Location: sheffield, south yourkshire
Re: No power! please help :-(
try swapping the vac valve around and see if the fault moves or not
Re: No power! please help :-(
An update.
Had a chance to do a little investigation this evening. I found that both the turbo actuator diaphragm and the EGR diaphragm both operate correctly.
I've proven this by applying a vacuum to each and they both hold pressure as they should.
The interesting part comes next.
When the EGR vacuum supply from the solenoid is disconnected but NOT blanked off (venting to atmosphere) the car runs normally with more power than ever, smooth driveabilty, little smoke on full throttle and no intermittant fault.
also the MPG reading on the fuel computer tells me that at a steady 75MPH on a level dual carriageway I am getting 44 MPG as opposed to 28-33MPG.
If you feel the output from the EGR control solenoid (vacuum) at idle, there is a strong vacuum, touch the accellerator and the vacuum dissappears.
Reconnect the pipe to the EGR valve and all the problems return - I am very confused but at least with this pipe disconnected, I can drive the car without the danger of pulling out of a junction at a snails pace and getting t-boned!
Any comments greatly appreciated!
Luke.
Had a chance to do a little investigation this evening. I found that both the turbo actuator diaphragm and the EGR diaphragm both operate correctly.
I've proven this by applying a vacuum to each and they both hold pressure as they should.
The interesting part comes next.
When the EGR vacuum supply from the solenoid is disconnected but NOT blanked off (venting to atmosphere) the car runs normally with more power than ever, smooth driveabilty, little smoke on full throttle and no intermittant fault.
also the MPG reading on the fuel computer tells me that at a steady 75MPH on a level dual carriageway I am getting 44 MPG as opposed to 28-33MPG.
If you feel the output from the EGR control solenoid (vacuum) at idle, there is a strong vacuum, touch the accellerator and the vacuum dissappears.
Reconnect the pipe to the EGR valve and all the problems return - I am very confused but at least with this pipe disconnected, I can drive the car without the danger of pulling out of a junction at a snails pace and getting t-boned!
Any comments greatly appreciated!
Luke.