Porsche Enthusiasts Club Forum

Hi,

My S2 has a slight judder when driving at 2000 rpm, this is in any gear!. I have checked the rotor arm and distributor cap, these are worn after 95k and I will replace them.
Is there any other item(s) that might need sorting , on acceleration its fine like s*** of a chrome shovel.

Cheers
Pete G

89 S2 44

Very sensitive to ignition especially plugs. Also the bits you mentioned. Also sign of the Air Flow Meter dying, unfortunately the best way of finding out is substitution & they're around the 200 quid mark.

Mines doing this and Jim is prolly right about the AFM. However it might be worth having a go at some diagnostics if you're handy with a MM.

Is the car also running rich?

Adam

The plugs are good and are the right colour, its just on the side of rich and has a more of a drinking problem than my old 2.5 Lux. I will change the rotor and cap before the air flow meter due to the cost

Cheers
Pete G

89 S2 44

Another vote for AFM, though when mine did it and I though that that was the cause it actually much improved through use and cleaning stuff up - especially the idle stabilising valve strangely enough.

I've just spent the day tuning mine up. A brand new rotor arm, cap,leads & plugs and she's running much more clockwork I have to say, and the vibe at 2000rpm is very much diminshed. As Jim will tell you theses cars are very sensitive to plugs etc.

Adam