Jittery when foots down lol

sorted · Post by **sorted** » Mon Oct 22, 2007 12:12 am

Hello

Having a wee prob will the GTI. Driving along in 1st change to 2nd - when i change to 2nd im at 2k revs, the car kinda jitters and theres like a loss of power, then it comes back and starts going again... anyone any ideas - ill vag com it 2morro, could it be a misfire ? if so how do i check!

tegwin · Post by **tegwin** » Mon Oct 22, 2007 10:56 am

I get something similar in 1st when the engine is cold...

Partially cured by cleaning the throttle body...

Mouse_GTI · Post by **Mouse_GTI** » Mon Oct 22, 2007 12:28 pm

Mine does this occasionally. Mine also will rev up and down of it's own accord when reversing. Get the biting point in reverse, no gas and the revs rise and fall causing the car to almost cut out

sorted · Post by **sorted** » Mon Oct 22, 2007 3:11 pm

Defo misfiring now.

I need to get some new sparks and leads. Do VW still do the red ones ?

Has anyone used performance ones?

Post by **alexperkins** » Mon Oct 22, 2007 5:42 pm

VW still make the leads

They aint cheap tho!!

New sparks and leads will fix most problem liike that, but a clean and realignment of the throttle body can make a world of difference. Add to that a new air cleaner element if required, and youll have a goodun

tegwin · Post by **tegwin** » Mon Oct 22, 2007 5:50 pm

Realighn throttle body...not heard of that one before.... Care to elaborate?

Post by **alexperkins** » Mon Oct 22, 2007 5:57 pm

With use, the throttle body butterfly valve can move out of alignment.

This can cause EPC lights, juddery accelleration, uncontrollable idling, stalling, clutch down issues, cutouts. All manner of issues. Some similar to that of the temperature sender.

First point of call in my book is throttle body alignment - it fixed mine and my mates the other day and they both run much much better now.

Anyhow, you can realign the throttle body in VAG COM (youll need a registered copy, or one that has been patched in one way or another to do this)

Drive-by-Wire (DBW) Engines using KW-1281

(These are engines WITHOUT a physical cable between the accelerator and the throttle. Check to see if the engine speaks KW-1281 by looking in the top left of the Open Controller Screen Some examples of KW-1281 engine controllers are 2000+ Golf/GTI/Jetta/New Beetle/Audi TT 1.8T)

Turn the key on but do not start the car.
[Select]
[01 - Engine]
[Measuring Blocks - 08]
Enter Group 060
[Go!]
[Switch to basic settings]
Once you do this you will see the top right display say ADP RUN. The TB adaptation is being done as soon as you switch to basic settings. You will see the values change and hear the TB cycle for the first few seconds then it will stop. Leave it in Basic Settings for about 30 seconds.
[Switch to Meas. Blocks] button and you're all set.
Be sure not to touch the accelerator and make sure the engine is NOT running when you do this!

The above is specifically for the GTI, as its a drive by wire engine. Other setups are here:

http://wiki.ross-tech.com/index.php/Thr ... ment_(TBA)

Its a very simple adjustment - just need to make sure the throttle body is nice and clean with a can of carb cleaner first - that can cause hell if its filthy also!!

mk5coz · Post by **mk5coz** » Mon Oct 22, 2007 9:38 pm

my gti was doing this too i spent Â£50 on new vw red leads new plugs oil and filter, and it was still happening. so i unplugged the throttle body connector for 30 mins then reconnected and drove sensibly for 10 miles and boy you could feel the difference after 10 miles it was like someone flicked a switch and everything was great. i suggest you drive 10 miles on a motorway to get best out of this as stop starts are no good for resetting the throttle body. but you have to be sensible with the gear changes or else it wont work.

sorted · Post by **sorted** » Tue Oct 23, 2007 9:42 am

Lead one is misfiring, took it off stuck on a mates. Worked fine

Going to go down to VW today and get a new one, hopefully have a red one in stock!