Now that my 1985 500 SEC is mechanically sound and idling wonderfully, I'm ready to upgrade the restrictive exhaust system. I've read the many posts regarding exhaust upgrade recommendations for replacing the less than effective US spec system. I hope to locate euro spec two piece exhaust manifolds and dual downpipes. 1989 Mercedes Benz 420 SEC Coupe C126 in a short Review. Scorecard Let's start with this diagram, Pressure Regulator Vacuum. The pressure regulator (also known as warm up regulator regulates the control pressure that goes to the fuel distributor. More control pressure= LESS fuel to the engine. Less control pressure= more fuel to the engine. The fuel regulator has an upper diaphragm (main diaphragm). Mercedes-Benz 500 SEC is an automobile that has a 2 door coupé type body designed by Bruno Sacco with a front mounted engine that delivers power to the rear wheels. It forms part of Mercedes-Benz's C 126 family of cars. Power is supplied by a single overhead camshaft, 5 litre naturally aspirated 8 cylinder motor, with 2 valves per cylinder The 1989 Mercedes Benz W126 500 SEC has 252 PS / 249 bhp / 185 kW. How much does a 1989 Mercedes Benz W126 500 SEC weighs? The 1989 Mercedes Benz W126 500 SEC weighs 1650 Kg / 3638 lbs. What is the top speed of a 1989 Mercedes Benz W126 500 SEC? The 1989 Mercedes Benz W126 500 SEC top speed is 230 Km/h / 143 mph. Is 1989 Mercedes Benz W126 500 1984 Mercedes-Benz 500SEC Price $17,990 mercedes-benz 500sec s by Year 1985 Mercedes-Benz 500SEC. 1984 Mercedes-Benz 500SEC. More mercedes-benz Here is why. Since the ICV interfaces with the Idle Control Box it seems like a voltage spike in the ICV could damage the Idle Control Box itself. I am posting voltage readings from a perfect running 1984 500 SEC Euro taken from the ICV pins. VOLTAGE IN THE PLUG: Car running high idle, plug disconnected. 1. Chadahar. 9528 posts · Joined 2008. #2 · Jun 17, 2008. Well My 380SE gets 25 mpg on a trip and 19 MPG around town. The 560 SEc gets 19 on a trip and 13-14 MPG around town. The SEC sits now and is only driven on the weekends and on special occasions. The 380SE is my daily driver. 6MPG is 1/3 better mileage! Eladó 1982/03 havi Mercedes W126 500 SEL szgk. Long kivitel, (Hirdetéskód: 20081927) MERCEDES-BENZ W 126 560 SEC COUPE.ROZSDAMENTES.FRISS VIZSGA.VAJBŐR!! 500 SEC AMG front spoilers. Thanks to Warren on the forum I managed to get a great looking spoiler for my SEC on Saturday. The shape looks spot on but it has slightly different attachment with screws sticking out around the top bit to bolt through the bumper while my old one obviously didn't have that – no holes, but mine had these bottom NjZltOI.