Tony G, check the floor under the car where drivers and passengers feet would be, where the chassis rails come down and meet the floor, also the bottom of the two wells either side of the spare wheel well, and if you haven't done so remove the plastic sill covers as the jacking points will require plating, no sills as such but the floor as you will alreday have discovered is an incredibly strong structure.
Also check around each and every one of those rubber bungs dotted around the rear wheelarches, water gets behind the underseal and corrosion results, and remove the lower door covers to check underneath, they can vibrate on the doors/panels and rub through the paint over time.
If its a 220/320 (facelift) especially the latter check the engine wiring loom carefully especially around the coils, if its crumbling it will short out and spike the ECU output transistors...don't ask me how i know this..:-) Full engine loom is about £600, but a smaller section is now available for the area worst affected but will need splicing into the existing loom. Do not ignore this, those ECU's depending on immobiliser type can be individual to the car, so sticking a used one in won't work, a new ECU is around £1500, i've had two repaired but parts to fix are getting rare, beware if you ever need to send one away for repair there are some sharks out there, i know a good place who fixed both for me, will inform if necessary.
Make sure you keep the OVP relay from the donor car, behind the battery near the ECU, a non starter is sometimes that relay going down, so worth chucking the spare in the boot just in case...i would say one of the cubbies but lack of those is the one big W124 weakness if the car has a passenger airbag.
They really are a lovely car to own and drive but need regular TLC to keep them up to scratch.
Edited by gordonbennet on 04/12/2013 at 20:09
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