Year: 1988. Model: 560SEC 6.9. Engine: 6.9 liter V8. Transmission: 3-speed automatic. Mileage :Â 61,453 mi. Price: AU $12,000 (~ $13,280 USD)Â Buy It Now. If you know what a 450SEL 6.9 car is and you know what a 560SEC coupe is, then you may imagine what the result of combining the two together might be. Awesome! NEW GENUINE MERCEDES--BENZ GERMANY RELAY IDLE SPEED CONTROL MODULE UNIT FUEL INJECTION IDLE AIR VALVE CONTROL UNIT PART # 006 545 85 32 # 004 545 11 32 FITS MERCEDES BY THE CHASSIS # VIN # R, W, MOTOR # M MODEL--YEAR YR 560SL R107.048 M117.967 YR. 1985-1989 560SEC cascade Lifetime Premium · #3 · Sep 27, 2009. Alan, I have some photocopies of some early UK and USA magazine comparison tests, for the 380/420/500/560 coupe and or sedan, and I can drop them off next week when I go back for my NEXT dental treatment session in San Francisco. Give me a call to remind me to photocopy them for you before then. The 560 SEC is far and away the best MB had to offer then. My car new was over 85 grand. I picked mine up for 5 grand and then put another 19 grand into it restoring it to near showroom. Parts are not cheap and neither is a good mechanic but are well worth it. The thing you will need to be careful about is speeding. Most 500's are Generation I, All 560's are generation II. 500's rarely have 4 wheel hydropneumatic suspension. 500's have a rear differential that allow them faster acceleration, 560's have a rear differential that allow them a greater top speed and torque. If you could get us vins of both cars we could help you more. 86 Mercedes 560sec wont start. i have a non-abused 86 Mercedes 560sec that turns over but will not start. One day. battery (i did disconnect the cars battery) it ran for about 7min then it cleanly died off. this to be my daily for junior and senor year in HS. Also, interior, the 560SEC would have The seatbelt warning light, Sunroof switch located on the console above the rear view mirror. On the 500SEC its just a light. The centre console were the window switches are located is also different. The style is different. On the 500SEC theres a rubber surrounding the gearbox. Mercedes-Maybach provides solid warranty coverage. 2.7 sec Top Gear, 50–70 mph: 3.6 sec Top Speed (gov ltd): 128 mph Braking, 70–0 mph: 185 ft Roadholding, 300-ft Skidpad: 0.91 g. A3Ry.