Club 80-90 Forums

Hi All

my 2.1 WBX or transmission has just started to produce an intermittent hiccup tonight. Vans a syncro with no decoupler viscous replaced about 12 months ago.

Drove about a 50 mile round trip and it started doing it about 2/3 of the way back. Just suddenly started to feel like it wasnt firing on all cylinders at about 3K RPM, let foot off gas reapplied and all was ok! Another 3 miles down the road same again. Loads of shaking and rattling foot off gas and back on problem went.

I have a few ideas but would like to know if others have had a similar problem and what it was.

Ive been running it on 95 RON and Im not sure if it maybe a pre detonation, issue although Ive been going to and from work in it for the last two weeks and no problem, engine not running hot etc.

Also do prop shafts cause intermittent rough running, or do they just go and not get any better?

Any pointer would be a real help, Im mainly used to Aircooled vehicles, so on a bit of a steep learning curve at the mo.

A very basic guide would be...

If you still get some reduced power whilst the juddering occurs, then prob an ignition prob. Check your plug leads, look at your plug colours and see if they are all the same. A darker plug will show up the problem cylinder.

If the whole engine dies, then prob an injection prob.

If it is always at 3000 rpm, then test your afm like this.

http://www.youtube.com/watch?v=6Tn8dyzn ... annel_page" onclick="window.open(this.href);return false;

Put meter probes in by the rubber plug cover, no need to dismantle the airbox, connect to pins 2 and 4.
You are looking for a nice steady meter voltage movement, and rough spots which would cause poor running would show up as reductions in the voltage.

Here is the long test version.

http://www.thesamba.com/vw/forum/viewtopic.php?t=369815" onclick="window.open(this.href);return false;

Check all wiring.

Hi Simon

Just been doing some reading and came to this conclusion, I think it is vangon syndrom. Just caught me by surprise, had visions of engine or prop shaft destroying its self , then again it could be the airflow meter.

Thanks for the pointer will be looking at the airflow meter tomorrow, vid makes things very clear, bentley manuals taking a bit of reading through.

Cheers again Simon.

Still really interested in how you fitted a roof bed to your high top.

Found this useful list of faults and remedies http://www.vanagonparts.com/tech_bulletins.html" onclick="window.open(this.href);return false;