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Can anyone advise on an independent Jetronic specialist in the Shropshire Herefordshire area? Persistent erratic running when hot needs sorting. Thanks, Steve

Thanks again. However is that readout for the 124 not the 126? Also this seems to be just for the AC circuit. If so that ties in with the fact that the A/c does not work - another thing on the list to fix later. I am not sure how those problems might affect the engine revs. But thanks for your...

Thanks, The 46 was the SEC coupe , the 35 SEL LWB and the 34 the SE . (I think) However, I think they all had the same 420 engine - but I wouldnt necessarily think Mercedes would use all the same electrics!!!! Even so, where did you find these code referencies in your attached file. I have...

Thanks 'Balge' Where was the test sheet linked? I would appreciate seeing that code reference sheet as none of the ones i have seen so far recognise a W126 046 .(420SEC 1990/1991) and none seem to have a output for 30 or 32. The erratic revs are only when the engine is warm/hot and between...

Thanks for the info. The tester I made was just to terminal 1 (Negative) and to 7. Do I need a connection to positive as well directly from the battery?? I seem to be getting a code read out - even though i cannot find what they mean!!! Thanks, Steve

420SEC (W126 046) In an attempt to solve some erratic revs problem on my 420SEC 1991, I have constructed a basic code reader tool and plugged it in to my diagnostic socket. HOWEVER: The 8 pin diagnostic socket on my car has only two terminals, 1 and 7 connected!! Also I get the codes 12, 30...

W126. 420 SEC. Electrical problems, They may be discrete or linked in some way??!- any suggestions:- 1, I can only operate the electric seats and windows with the door open!!! 2, Wipers have stopped working. I rebuilt the headlamp washer motors recently and all the mechanical parts for...

I have found conflicting views on fitting an easily available replacement front wings available for W126 saloons to a W126 sec. I have a 420 sec that needs some work on front (and rear) wings in the normal places, but I cannot find any aftermarket ones specifically for sec. Some suppliers say...