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Hi, the central locking on my 4-door w140 works, but the front passenger lock is starting to get temperamental. It rarely locks when I lock the other doors. It sometimes opens with the others. Where should I look first? Many thanks for all of your ideas Kieron

sounds promising, if expensive! I'll check out the diff oil.

Hi - should be simple to answer this, but I am paranoid about ruining my wheels so which cleaner should I use? I have the standard wheels fitted to a W140. They don't seem to be laquered, just some sort of alloy. I have black deposits from the brake dust that I want to clean up. Any...

thought the FP relay was in the boot next to the fuse box.

Further to this unsolved problem, I cannot find the rear window demist relay!! The diagram I could find showed it in the boot, rhs next to the Fuel Pump relay and rear fuse box. However, I just have a space there. Does anyone know where it might be hiding, thanks, Kieron

thanks for the input so far. I recently changed the rear tyres and it has made no difference, plus the sound does not change when moving across different surfaces. When I said the brakes were worked on, I meant the footbrake; it was taken apart and cleaned. I still tried the test you...

Hi - latest issue on my w140 is this. For several thousand miles now, I've had this low speed grinding noise coming from the rear of the car. It's hard to tell whether it's left or right. So far what I have done is 1. had the brakes checked 2. topped up differential oil 3. changed rear wheel...

Hi. the rear window demister does not work on my w140 (1993). Last summer I had the window replaced in Germany because the window was delaminating at the corners and the hrw was not working. I have checked the connections behind the covers in the c pillars and they are fine. However, there is...

Yep - vacuum pipe problem. All sorted now and sweet as a nut! Thanks for all your help. Happy New Year.

Thanks for all your comments guys, It has new distributor caps and rotors. Suppose it could be the leads breaking down? Any thoughts/experiences on the ignition module failing? What is an OVP? I'm not going to let this beat me, Appreciate the 2nd hand MAS comment. However, a new one is...

It was a second hand one from Carl at w140 spares. Can you be a bit more specific? Sorry!

I have just changed the air mass meter (today), but it has not made any difference. What should I check next? Kieron

Hi, my s500 has a few problems and I need some pointers to get me started. 1. Starts fine from cold/hot but tickover is quite erratic - rising, falling, steady for a bit then dropping, rising in a kind of random fashion. Some days it's worse than others. 2. If I drive it for a couple of miles...

Mine did that a few weeks back. Needed a new heater blower control unit as I'd bought a cheap replacement off fleabay. Ended up getting a Bosche 2nd hand part from Carl at w140 spares. Good luck. Kieron

I'm having similar problems with my w140 s500. It starts fine and when absolutely cold, tickover is fine. I'll go for a drive for a couple of miles and stop the engine for a few minutes then start it and the idle is really rough - it's often stalls when waiting at a junction and this problem...

I have a w140 S500 on lpg. Had it for nearly a year now. With the conversion cost (£1200) plus several massive bills, I'm now skint but loving the car!

I run my s500 1993 on LPG. I ran it down to Bulgaria this year and saved a whopping £600 for the whole trip, half the cost of the (multipoint) conversion! It won;t be long now before it has paid for itself.

Hi, thought I'd share with you my very recent trip through Europe down to Bulgaria in my 1993 S500. I had a conversion to lpg before the trip as I reckon this saved me about £500 for the return journey. It's about 1800 miles one way, through France, Belgium, Germany, Austria, Hungary, Serbia and...

That's gonna give me nightmares

Hi - my W140 S500 is a daily used car. However, I've had it a few months and the list of repairs is already quite long (and pricey). I feel that I have been catching up on money not spent over the past few years. Hopefully, yours has a more comprehensive service history! I have replaced the...