I have a 06 GTI with a 6speed manual. With the pedal to the floor the Blow off valve releases pressure at about 3000rpm in 3rd gear, 3500 in 4th, etc etc. If u keep the foot to the floor for a few seconds after pressure is released the car will once again accelerate and build boost. Any ideas what could be the cause ? I recently had the fuel pump replaced, so it shouldn’t be a fuel starvation issue. Please tell me of any ideas of what could be wrong !
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Sudden release of boost under acceleration
- Thread starter Mason_L
- Start date
A few questions...
- Do you have any tools to scan codes from the car? That could help point you in the right direction.
- When changing the fuel pump, did you check and/or replace the cam follower?
- Do you know if the diverter valve (closed loop blow off valve) has been checked or replaced since the car was new? Older variants were notorious for failing.
Sorry for the delayed response.
-I do not have a code reader as of yet. I have been meaning to order one, just haven't quite had the extra money yet.
-The cam follower should be new, I didn’t replace the pump I had a shop do it as it was apart of state inspection.
-There is no documented history of the diverter valve being replaced. So I am assuming it is the original one.
I talked to a VW specialty shop near me and they said it MIGHT be a seized waste gate. Which would mean replacing the turbo entirely…
I appreciate any thoughts or ideas as to what could be the issue. Especially if it saves me from paying a shop to trouble shoot if I am unable to find the issue.
-I do not have a code reader as of yet. I have been meaning to order one, just haven't quite had the extra money yet.
-The cam follower should be new, I didn’t replace the pump I had a shop do it as it was apart of state inspection.
-There is no documented history of the diverter valve being replaced. So I am assuming it is the original one.
I talked to a VW specialty shop near me and they said it MIGHT be a seized waste gate. Which would mean replacing the turbo entirely…
I appreciate any thoughts or ideas as to what could be the issue. Especially if it saves me from paying a shop to trouble shoot if I am unable to find the issue.
Off the cuff, my mind goes to:
- Diverter valve (DV) which is attached to bottom of the turbo.
- Wastegate control valve (N75) which is located near the neck of the turbo inlet where the intake connects.
- A possible fuel supply issue, but I would rule out the first two before diving into that. Would also check your invoice or ask the shop who did the fuel pump replacement if they also replaced the cam follower (06D109309C) as they are two separate parts.
update:
Replaced the cam follower today, it appears to have fixed the problem.
Before I did the replacement I was getting a P0089 engine code. But afterwards the check engine light was off and I was no longer getting the code. Car drives good now, no lost of boost under acceleration. The old cam follower was near failure. I’m glad I changed before doing any more driving with the vehicle.
I just have to hope that the problem stays fixed the cheek engine light stays off !!
Now I just need to get some new headlights and wipers LOL!
Replaced the cam follower today, it appears to have fixed the problem.
Before I did the replacement I was getting a P0089 engine code. But afterwards the check engine light was off and I was no longer getting the code. Car drives good now, no lost of boost under acceleration. The old cam follower was near failure. I’m glad I changed before doing any more driving with the vehicle.
I just have to hope that the problem stays fixed the cheek engine light stays off !!
Now I just need to get some new headlights and wipers LOL!
Nice! Wipers are easy. Headlights not cheap!
If you're not tuned/modified I would recommend checking your cam follower every 25-30k miles. They will wear out and if you punch a hole in it, that means the HPFP is riding the cam lobe without protection from the follower. If that gets worn too much you could wind up having to replace the entire cam.
If you're not tuned/modified I would recommend checking your cam follower every 25-30k miles. They will wear out and if you punch a hole in it, that means the HPFP is riding the cam lobe without protection from the follower. If that gets worn too much you could wind up having to replace the entire cam.
.Take a look at this thread. There's a link to an Audizine thread that talks about the cam...
https://www.golfmkv.com/forums/index.php?threads/p0089-fix.166309/
Could be your fuel filter (should replace every 40k or so). Hopefully not the cam.
https://www.golfmkv.com/forums/index.php?threads/p0089-fix.166309/
Could be your fuel filter (should replace every 40k or so). Hopefully not the cam.