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Model specific boards => Golf mk3 => Topic started by: edzman47 on 17 April 2007, 16:05

Title: 8v very jumpy on warming up????
Post by: edzman47 on 17 April 2007, 16:05

Hi I hav a 98 MK3 8V with just under 50,000 on the clock, the car is in excellent condtion and get commets on it daily about how good nick it's in, Ive had it about 2 years now and all has been fine up till now(just a few little things like wear and tear,base ignition timing was out when I 1st had it, that was sorted). The car starts fine in all weather but I fined that when it is warming up and I'm driving on the motorway at say 50 to 60mph if I put my foot down a bit to speed up the car starts to judder and it feels like it is holding back if I stay at the same speed it feel a little bit jumpy and not right, once it has warmed up fully it's ok most of the time but I does seam to be hold back a bit and not as smooth and quick as it was before when I 1st had it, Ive also cleaned out the throttle body this help it bit. . I have just had it back from VW last friday which it had a service and I also told them about this but they could not find any fault on their dignostic, please can someone help me with this problem or tell me where to start to solve it .Thanks.....

Title: Re: 8v very jumpy on warming up????
Post by: Len on 17 April 2007, 16:16

Relays! First culprit to check anyhow! Fuel and ECU relays.

Title: Re: 8v very jumpy on warming up????
Post by: edzman47 on 17 April 2007, 16:30

So thats try changing the fuel pump and the ecu relay, any idea how much these parts will cost???? ps thanks for your very quick post, cheers.

Title: Re: 8v very jumpy on warming up????
Post by: Matt-GTi on 17 April 2007, 16:33

try taking out the relays and cleaning the connections before getting new ones, worked on mine  :smiley:

Title: Re: 8v very jumpy on warming up????
Post by: Len on 17 April 2007, 16:39

They are only 10/12 quid each from the VAG stealers.

And you can bet they will go eventually as its one of the most common faults on Mk3's

Title: Re: 8v very jumpy on warming up????
Post by: edzman47 on 17 April 2007, 16:43

Where by are they on the engine of the car????  :smiley:

Title: Re: 8v very jumpy on warming up????
Post by: Len on 17 April 2007, 16:46

Nah mate up under the dash in the fuse box. This is down by the drivers right knee. Fuses at the bottom, relays above.
Its number 30 fro the ECU and I believe 167 fuel the fuel.

Title: Re: 8v very jumpy on warming up????
Post by: edzman47 on 17 April 2007, 16:48

Cool thanks.  :rolleyes:

Title: Re: 8v very jumpy on warming up????
Post by: edzman47 on 26 April 2007, 16:01

Just changed the Fuel and ECU relays cost me 40.00 quid and the car is still the same, anything else I can try??? :cry: :cry:

Title: Re: 8v very jumpy on warming up????
Post by: Len on 26 April 2007, 16:55

The symptoms you described were classic for the relays!

Hmmmmm how about dizzy cap and rotor arm? They been changed lately?

Title: Re: 8v very jumpy on warming up????
Post by: rubjonny on 26 April 2007, 17:21

ecu temp sensor would be next on the list :)

Title: Re: 8v very jumpy on warming up????
Post by: edzman47 on 02 May 2007, 13:36

Just taken the MAF(mass air flow meter) clean the two little hotwires with a cotton bud and some  carb cleaner...and she runs just like the 1st day I had her...well happy :smiley: :smiley: :smiley:

Title: Re: 8v very jumpy on warming up????
Post by: Len on 02 May 2007, 13:50

so exactly where is the MAF? Tried to identify it myself from the Haynes but to no avail!!!

Title: Re: 8v very jumpy on warming up????
Post by: edzman47 on 02 May 2007, 13:56

It by the air box between this and the pipe, it has got Hitachi writen on it.

Title: Re: 8v very jumpy on warming up????
Post by: Len on 02 May 2007, 13:58

Did ya post a pic? cant see em at work, they get blocked!
So is it an upright cylinder?

Title: Re: 8v very jumpy on warming up????
Post by: edzman47 on 02 May 2007, 14:07

There pics of the part on this site type in MAF sensor in the search bit, have a good look around and they are there.

Title: Re: 8v very jumpy on warming up????
Post by: Len on 02 May 2007, 14:14

Ummmm but I cant see any pics on here! Work filters block them!
I'll have to be patient until next time I'm online at home.

Title: Re: 8v very jumpy on warming up????
Post by: boneybradley on 02 May 2007, 14:18

it's only the 8v with simos/siemens injection that has a maf sensor..... i would post a pic but i cant access photobucket at work.... try this link for the last time i put a pic of my engine on here http://www.golfgtiforum.co.uk/index.php?topic=53465.msg416430#msg416430 (http://www.golfgtiforum.co.uk/index.php?topic=53465.msg416430#msg416430)