Golf IV R32 :: Burst Vacuum Pipe And CEL After Rapid Deceleration?
May 25, 2015
The other day I decelerated rapidly. I didn't slam on the brakes, but I went from maybe 45mph to 0 in maybe 40 feet or so. When the car stopped, the CEL came on. No apparent issues at the time so I drove it the last few miles home. I checked under the hood with the engine running and heard a whistling noise which I tracked to the plastic pipe connecting the intake manifold to the brake booster. I didn't take a picture of it, but it is the one that has a silver heat wrap on part of it where it passes close to the throttle body. I grabbed a random pic online that kinda shows it.
R32 bay pic by isaacpettit, on Flickr
I believe this pipe feeds air from the intake manifold to charge the brake booster? If this was the case, I thought possible by hitting the brakes harder than usual the back pressure at the check valve was enough to burst the plastic pipe, which may have been heated, stressed already? Then the vacuum leak caused the CEL?
What is the actual purpose of that pipe. The car is well maintained with recent service and just over 30K miles.
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Today I noticed that it feels like my R decelerates rather quickly as soon as I take my foot off the gas. In my old GTI, it seemed that it would glide in whatever gear I was in for a while. In this, however, It seems to slow down VERY quickly if I am not pressing in the accelerator.
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I read a thread a while back where a fellas intake changeover failed and it started doing that really loud as well.
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My rear diff had recently started to whine on decel, what I am looking to find out is, would replacing the stock rear diff itself with a peloquin unit be enough of a fix, or should the whole rear housing be replaced as well? I don't want to buy a peloquin rear diff and install it and still have issues because of the pinion shaft being the culprit or something else.
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I have a whistle sound mostly upon decel when the engine was cold. I have the APR down pipe installed. Today it's doing it all the time even when warm. I took the car to the dealer and they said it was prolly an exhaust leak. I took the car to my friends shop and we put the car up on the lift and listened from underneath. It sounded like the turbo was echoing in the down pipe. Sometimes when it's cold it can be very loud. So my question is if this is normal with the APR down pipe or with this turbo or is this a sign that I have a turbo failure coming?
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