Audi 80 2.0L ABK engine juddering/misfire

Thanks very much Enrich -your advice is much appreciated

I will order a replacement Relay 30 and have a go at fitting it this coming week

Hi we have a 1990 audi 80 20e that has a juddering that feels like a badly balanced wheel but it's not. Only occurs under load and not when coasting. Really bad around 7o-80 km/h.
Would like to try the relay 30 repair but can't find it under the steering wheel.
This one came to n.z. via japan. Maybe it's different.
Has fuel injection. Any ideas greatly appreciated.

p.s. how do I identify abk engine ?

The ABK has electronic injectors, ie a fuel rail and wiring plugs. I think they came out in 1991 with the B4 body so your 1990 would be a 3A with CIS/mechanical injection? The 3A does have an ECU but it may not have the same relay?

Yes you are correct. It has the CIS system. Thank you. Can any one help identify the relay that controls the ecu for this motor ?

Ok, done the usual, changed plugs, rotor arm, air filter, still juddering, so off i went and picked up a new relay 30, guess what? No different!!!!
So back to square one, just for info the replacement relay was brand new purchased from a local VW dealer.
Any ideas folks?

Thanks in advance.:beerchug:

Hi. Problem sorted. Turned out to be both inboard c.v's worn out. Replaced with good secondhand complete driveshafts as we couldn't wait for new parts from Germany. Drives like a limo now.

Hey this is my first post as I thought I would check out the juddering that my 1994 cabrio is suffering from. This is the second time in 3 years my car has suffered from it it was taken to my local Audi specialist (not a franchised dealer) sorted out the problem straight away the problem with the juddering and what feels like misfiring is............. the Engine Speed Sensor once this was changed I had no problems at all.

Hope this was of some help

Steve

first post on this thread,i to am juddering along,mechanic read codes he said throttle valve actuator ( code 17976 ) limp mode ,intermittent any ideas,
car mis-fires when idle,judders thro-all speeds but seems worse around 40mph and very light throttle also judderin when releasing acc pedal at speed
no leaks (smoke machine detection )leads good ,maf good,coils not sure (2 coils feed all four pots)

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Originally Posted by sdk778

Ok, done the usual, changed plugs, rotor arm, air filter, still juddering, so off i went and picked up a new relay 30, guess what? No different!!!!
So back to square one, just for info the replacement relay was brand new purchased from a local VW dealer.
Any ideas folks?

Thanks in advance.:beerchug:

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I would suggest you disconnect the vehicle speed sensor (it's located next to the inboard cv joint, not sure which side sorry!) the speedo won't work, but you will have eliminated something either way...