Mk5 Gti Engine cuts out after gear change

[KennyL]

After very quick gear changes normally from 3rd to 4th or 4th to 5th there is no power available as if the ignition is turned off for a couple of seconds this seems to clear when accelerator pedal is released and then applied again.This has only ever happened on track and I have never been able to make it happen on the road.There are a few possible causes ie- Ecu goes into limp mode, fuel, delay in fly by wire, etc.
Wondered if anyone else has experienced this problem and have a solution.

[xxx_mojo_xxx]

Check your diverter valve...this is known to tear...and exhibit similar issues to what you have mentioned.

[KennyL]

Thanks for advise. The diverter valve has been changed for a Forge DV.

[Poppa Dom]

Have you got access to VCDS, seen what DTC's might be on they ECU etc?

[KennyL]

If you are refering to fault codes in the ECU there has never been anything show up, thats whats frustrating about this.
It has been suggested to go along to a track with datalogging equiptment and try to log it when it occurs but that sounds expensive !

[Hurdy]

Hi Kenny,

I have experienced this a few times when at full chat, The issue for my car is sometimes the "confusion" when I am in manual mode (my car is DSG), as if the car was ready for an upshift, but I downshift.

The other times have been when the car has been really used hard for a few laps and like you say, the car seems to pause.......................for a moment, before the power comes back in. I haven't tried to bypass the issue as, like you say it only happens once in a while.

Generally speaking the car is spot on when under normal road conditions.

I doubt if it is limp mode as the car would need to be turned off and on again to clear it. Fuel should only be an issue at between 2.9 to 3.4k miles where the car is producing max torque and this could be a possibility if you drop the revs into this band on an upchange. There can be a pause in the fly-by-wire too and there is a throttle modulator on the market that can decrease the reaction times of the stock system, so this would help.

[cuprak1]

sounds normal to me ... its just how the computer sends the signal to TB.. its the fly by wire system, its a pain in the ass when "racing" you can loose valuable split seconds for the power to get put on no matter how fast your gear changes are

[KennyL]

I have been using one of these on my X6 but for a different reason. Got talked into it at my local tyre supplier who was selling them.

I bought what was branded as a sprint booster ( sounds tacky, I know ) to quicken the response time when pulling out of junctions etc and it has sharpened things up a little. Bit like having a sport button.

Could be worth a try. Be interesting to know if they are used for racing ! Or anyone using one on the golf for that matter !

Shame I cant use the one Ive got as apparently they are vehicle specific.

[cuprak1]

I have been using one of these on my X6 but for a different reason. Got talked into it at my local tyre supplier who was selling them.

I bought what was branded as a sprint booster ( sounds tacky, I know ) to quicken the response time when pulling out of junctions etc and it has sharpened things up a little. Bit like having a sport button.

Could be worth a try. Be interesting to know if they are used for racing ! Or anyone using one on the golf for that matter !

Shame I cant use the one Ive got as apparently they are vehicle specific.

I wouldnt get a sprint booster ...

Our throttle position (load) is already adjustable.

What it comes down to is that it doesn't make any power, and gives you a more sensitive throttle.

This effectively reduces the resolution of your accel pedal! Say you are on the track, coming out of a corner. You want about 25% throttle at the apex and increasing smoothly afterwards.

Would you rather be concerned with controlling the weight of your foot in a narrow or wide angle?

want a review of the booster just read here - http://bipesauto.com/sprintbooster/SprintBooster.pdf

[WhiteGTI]

Get a WOT kit! http://www.mk5golfgti.co.uk/forum/index.php?topic=3769.0

Although this is probably not the reason, but were you driving with ESP on or off? Ive found that with ESP on if i change up the gears very very fast, then as soon as i release the clutch for the new gear there is a massive flat spot/pause. I tried the exact same stretch of road immediately afterwards with the ESP off, and the car was perfect. (note. that the ESP light never flashed on this occasion either). It seems to work in the background. I've experienced this many times, and it is always cured by turning the ESP off.

[jonnyc]

Get a WOT kit! http://www.mk5golfgti.co.uk/forum/index.php?topic=3769.0

Although this is probably not the reason, but were you driving with ESP on or off? Ive found that with ESP on if i change up the gears very very fast, then as soon as i release the clutch for the new gear there is a massive flat spot/pause. I tried the exact same stretch of road immediately afterwards with the ESP off, and the car was perfect. (note. that the ESP light never flashed on this occasion either). It seems to work in the background. I've experienced this many times, and it is always cured by turning the ESP off.

If it's an ESP problem then getting a WOT Box will only increase the problem as the power is instantly delivered after the gear change.. No matter how quickly you change you won't get the same hit after the change without it..

I can't imagine it is an ESP or traction issue however as the OP mentioned he was getting this changing from 4th to 5th..

Sounds more like a TPS or TB allignment issue, turn the ignition on and allow the TB to go through it's start up and allignment procedure, you will hear it stop after about 30 seconds then try it again..

Hope you get it sorted out..

[KennyL]

This problem has only ever occured on track and I always drive on track with Esp switched off.

I like the sound of the WOT box. Used to use a quickshifter few years ago on motorbikes sounds simular. Did'nt know you could use this sort of thing on cars.

Is anyone using one ? Can you buy them in UK ?

Interestingly Mark at Backdraft motorsport who have done some of work on my car suggested re-aligning the throttle bodies.

What does TPS stand for ?

[jonnyc]

Yeah I have a WOT box, Check out the build thread on the S3 for details..

TPS is throttle position sensor, if that is faulty then you will have issues, just throwing a couple of ideas around anyways! : )

This problem has only ever occured on track and I always drive on track with Esp switched off.

I like the sound of the WOT box. Used to use a quickshifter few years ago on motorbikes sounds simular. Did'nt know you could use this sort of thing on cars.

Is anyone using one ? Can you buy them in UK ?

Interestingly Mark at Backdraft motorsport who have done some of work on my car suggested re-aligning the throttle bodies.

What does TPS stand for ?