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Intermittent Stalling and Powerloss

Posted: Thu Nov 30, 2006 2:33 pm
by shantybeater
Hi, Just wondering if anyone out there has had or is having similar problems, since purchasing my car several weeks ago it seems to stall about once a day, i've noticed several things about it:

-It only happens after a short drive 3-5mins (so engine warm)
-It stalls when stationary(if you leave it long enough, once i was at the lights and the revs started going irratic jumped to 1500 revs without me touching the pedal and then stalled)
-It stalls even when i'm going around 25mph, i feel power loss as if i've depressed the accelarator, which seems to act irratic so it looses and gains power. (last time i tried changing down a gear which didnt solve the problem. the car then stalled and the epc light came up until i restarted)
-If you press the accelarator harder whilst it is having power loss it has no effect or has loads of delay.
-It doesnt always stall (after the stall mentioned above i was going along, felt the power loss & the engine management light came on but no stall)
-After it stalls it turns over when trying to restart and sounds unhappy but if you leave the car for a minute and try restarting there is no problem

The weird thing is that the rest of the time the car acts completely fine, without any power loss or anything like that, i can go out for a drive without it doing it at all. I just had the camblet changed & new water pump to go with it but that didnt solve the situation..

Posted: Thu Nov 30, 2006 4:56 pm
by VR6 South
I had a similar problem and it turned out to be a camshaft speed sensor.

loss of power

Posted: Thu Nov 30, 2006 6:00 pm
by farnster
i would get the cambelt checked out yor pre tensioners could have gone!

Posted: Fri Dec 01, 2006 9:13 am
by shantybeater
even though i got it changed at VW yesterday?

Posted: Fri Dec 01, 2006 10:31 am
by Dangerous Dave
sounds like the camshaft speed sensor to me the fact its so intermittant could mean its only a lose connection to it, not an expensive part to change though to rule it out.

Posted: Fri Dec 01, 2006 10:46 am
by VR6 South
It may be worth investing in a new set of HT leads as well.

Posted: Fri Dec 01, 2006 12:36 pm
by shantybeater
cheers for the help guys, lets hope i can get it sorted quickly and cheaply

Posted: Fri Dec 01, 2006 1:16 pm
by Ry`
VR6 South wrote:It may be worth investing in a new set of HT leads as well.
Yeah, this sounds a sensible idea. Mine sometimes had problems starting up, it cough and made loads of noises, even when I applied the accelerator, the rev counter went all over, but nothing happened

I replaced the HT leads, and I’ve had no problems since.

Posted: Sun Dec 03, 2006 4:47 pm
by shantybeater
sorted, took it to the garage, the speed sensor was faulty....back to loving it :)

Posted: Sun Dec 03, 2006 9:21 pm
by mk4 glx 1.6
Dangerous Dave wrote:sounds like the camshaft speed sensor to me the fact its so intermittant could mean its only a lose connection to it, not an expensive part to change though to rule it out.
Excellent diagnosis by Dave, once again. He really does know his stuff, I for one am very appreciative.

Posted: Sun Dec 03, 2006 10:41 pm
by shantybeater
cheers for all the responses :D