Beetle thinks its a Kangaroo

[bluebugdeb]

Hi

I am a Newbie here so a hello to you all.

I have owned my Beetle for about 5 years now. It's a 1.6 with winter pack in Techno Blue.

I have had a few prob's with the car down through the years but none as frustrating as the one it has at the moment.From cold the engine hunts badly with the rev's rising and falling to the point that on some occassions the engine will die. As you can imagine pulling away with a cold engine is becoming an acquired art.

I dont know if it is related but at the last MOT the bug refused to hold 2500 revs for the emissions test. The moment the rev's hit 1500 they carried on rising to 4000 + with no way of holding it anywhere between.

I hope that you maybe able to assist as this is spoiling what is otherwise a very good car.

Thank you very much

[noR]

Sorry I can't be specific. but I'd bet it's either a MAF or O2 sensor causing the problem.

I would unplug the MAF and start the car; see how it does. If the problem subsides, problem found, otherwise you can eliminate the MAF from the possible problem list.

You have 2 O2 sensors, only the front most sensor affects the motor; the rear only reports back how good/bad a job the catalytic converter is doing.

[bluebugdeb]

Thanks noR

Now I do know my big ends from my gudgeon pins, but what is a MAF and where can I find it ?

Cheers

[lojasmo]

Originally Posted by bluebugdeb

Thanks noR

Now I do know my big ends from my gudgeon pins, but what is a MAF and where can I find it ?

Cheers

Most nobody here will know about your exact setup...but...

MAF resides in the intake tube between your airbox, and the engine. There will be a plug coupled to the intake tube.



The plug is at the top of the picture.

[bluebugdeb]

Cheers for that Guys.

Will remove the MAF with a hammer over the weekend to see what occurs

Thanks for all your help

[dunno513]

I'm thinking it's something wrong with the DBW system.. AKA that electrical "drive by wire" rather than cable foot to throttle controller. Only sounds logical, unless something else is keeping the car rpm's lower until at 1500 it releases and lets the car rev normally.

Just a thought, but isn't the brake switch sensor somehow related to keeping rev's low if it's been depressed.

[noR]

Haha. Yeah, might I suggest just removing the electrical connection, and leaving the hammer for more civilized purposes; like sharing dings w/your neighbor when you see their paint on your bug....

dunno15, the only thing I can think the brake switch could do is prevent throttle by incorrectly sensing constant pressure on the brake pedal. Which, when they fail, they typically just register no pressure [so you're stuck in P, and/or the taillights don't work] I do not believe that switch would have any effect on idle whatsoever.

[dunno513]

Could also be as simple as a fuel pump/restriction issue. I had a boat do this once with a failed high pressure pump on a common rail injection system. Idled fine, but as soon as you gave er throttle, it would either bog, or rev then die. It was like driving with grandma.