Hi Guys,

 

Just a quick question:

 

Had to brake rather suddenly and quite hard to dodge some snotty kid running after his football crossing the road - ABS works great by the way. I wasn't going all that fast so the car stopped dead in its tracks, all was ok for a second or two and then the rpms dropped to about 250~300 and nearly stalled the car! Looks like the ECU kicked in and raised the revs to normal level and all is fine. However, I can replicate this "near stalling" experience every time I brake hard. Under normal braking or hard cornering the car behaves perfectly normal.

 

Could this potentially be a PCV valve problem? I've never experienced it before nor have I heard of this problem so am grabbing at straws at the moment. My p/s PCV valve and hose was changed about 6k miles ago and I have yet to get to the driver's side one.

 

My car is a J-spec Auto 2+2 TT.

 

Any feedback or suggestion are much appreciated.

 

Regards,

Could it not just be a simple loose wire say on the PTU?

 

I'd check all the connections first.

I know the answer and will swap it for a set of speedo rings..

 

LOL. Isn't it the PCV valves with the spring inside that can wear over time and the braking causes the movement inside? Or am I thinking of something else? :x:

The hamsters lost grip on the compressor blades and momentarily shot to the front of the turbo where they hindered airflow??? :D

 

Try cleaning the idle valve assembly at the back of the plenum - sounds like it may be a bit gummed up and taking slightly longer to react. Also check TPS for adjustment, clean TBs - the usual idle related stuff ;)

 

HTH

 

CheerZ,

 

Andy

My engine occasionally stalls when I'm trying to parallel park, dabbing the brakes/clutch a lot.

 

Could be vacuum related I guess as obviously the brakes and clutch work on vacuum servos. I reckon the vacuum could drop to almost nothing (or would it be too strong?? - I haven't really thought this through, I'll get my coat) if you're hitting brake and clutch at low speed....

 

Maybe more that the vacuum pressure is changing quite suddenly when using clutch/brake and upsetting intake??

 

My farthing's worth.

 

RobH

Hey Danny,

 

I used to get this all the time... really embarassing isn't it?! One time my mate went tearing down the road, slammed the brakes on and stalled it (in my auto), then sat there crapping himself that he was f*cking my turbos... trying to start it in drive. Not good. Anyway, I think what Duff is saying is probably best even if you don't seem to have a problem at standing idle. My timing was also retarted to cope with the extra boost which I don't think helped. And my lump was old and tired (full of goo).

Best you go see a doctor my friend ;D

when my battery was dieing if I turned the air con on and turned the steering wheel at the same time i had exactly the same thing happen. (although i couldnt stall the car)

 

may be a simple electrical fault, or maybe its just the load on alternator or battery.

Probably unrelated but when I switch from P to D the revs do drop by a few hundred but it has not stalled yet!.

I used to have this until I fixed the holes in my exhaust. Still dips a lot but doesn't stall - I think my base idle was too low (400rpm) and my IAA valve needed a clean.

 

Just need to sort my base idle now :D

Danny, couldn't you just plug one of your conzults in, then try the braking sharpely routine and have the passenger tell yer what came up on the readings, or is that not possible ? i don't have one see so just guessing.

smithy

Very funny Smithy! :D :slap: I'm afraid that this problem appears to be mechanical rather than electrical so a ConZult will not help (although I did plug it in to confirm all is well with all other sensors).

 

Thanks everyone else for your input. I will try and sort this gremlin out over the weekend. I have just recently cleaned the TB's and all electrical contacts in sight but will now give the idle valve assembly a clean (thanks Andy D.) Suppose that when you spray the TB's with carb cleaner it has got to go somewhere, and seeing as how the idle valve assembly sits at the back all the gunk probably ends up in there!

 

Happy Zedding everyone!

Erm, that was a serious reply :rolleyes: assumed a fault finder (conzult) may possibly detect it whilst driving, no worries

smithy :cool:

Originally posted by Danny

Suppose that when you spray the TB's with carb cleaner it has got to go somewhere, and seeing as how the idle valve assembly sits at the back all the gunk probably ends up in there!

 

Absolutely spot on! This is why you usually get high idle after cleaning the TBs ;)