2003 New Beetle 1.6L running rough

[Lucas_R]

My cable is HEX+CAN according to its label, which means that it "should" be able to communicate with your car. Mind you, i have never used it on anything older than a 2007/08 model Golf - so there is a possibility that it may not work.

Might be a safer bet to just pay $80 and get the VW dealer to scan it. Another option is European Car Centre at Wickham who would be able to scan it for you.

PM me if you want to discuss further.

[jarredking]

latest with this car is volkswagen cannot fix it, they say there is nothing wrong with the car.

There IS definately a problem with the car. from what i have read it could be a coolant sensor. car runs fine when the blue cold engine light IS NOT on.

Can i somehow trick the car to thinking its warm all the time?

[Umai Naa!!]

Could be the air mass sensor.

They won't throw a code when they play up.

[Lucas_R]

The issue sounds very similar/same as something my old Nissan 200sx used to do when it was cold.

If you started it up (cold start) in the morning and drove down the street on very light throttle and low revs, it would misfire (just at a particular level of load and RPM) for mabye 30-45 seconds until the engine got a bit warmer and then it went away.

Did it every time on a cold engine if you got the revs/load at the right spot. Once warm the car ran perfectly fine and never had a single issue with it. I tried and tried to find what was causing the misfire, but after changing various sensors (o2 sensor/cam sensor etc) as well as the ignition coils, spark plugs, fuel filter etc.....i ended up giving up as nothing made it go away.

I ended up putting it down to a "characteristic" of that car. It was a little bit annoying to me because i am fussy, but it never caused any issues what so ever to the car.

[brad]

darn, so i was onto nothing there. Are these vag-coms worth it? there only $50 on ebay

I have an eBay one. It works on earlier vehicles - maybe. Certainly doesn't work on my 2007 Skoda

[jarredking]

ok just spent a few hours on it. pulled throttle body apart and was full of carbon gunk build up. cleaned it out with throttle body cleaner and ran the engine. ran rough like expected but after half an hour it was still running rough.

as i was putting panels back on, i noticed there was a breather hose that goes from the air intake to engine oil fill point which didnt have a clamp, put a $3 clamp and and although the engine is hot its running like a dream.

fingers crossed its fixed when i start it cold again.

[Reedy]

I know it's been a while but was wondering whether you fixed this issue. I have a similar issue with my mk6 golf gti. On cold starts if I hold the throttle between 1000 rpm to 1800 rpm it will ref very erratically and won't hold steady. This makes the car very jerky when driving but it does seem to idle fine. When the car is warm it is heeps better but I still get a little cough and splutter around 1400 rpm when driving or still.


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