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AGuess Elite Veteran Date registered: Apr 2006 Location: Holly Springs NC Vehicle(s): 93 500GE, 93 500GE, 2002 G500 Posts: 717 | 1993 M117 engine - 500GE Problem Hi Everyone, on my Son's 500GE, 310K miles, the engine started having problems. He was driving and started loosing power, no acceleration, then it would stall. Things I need to do, so I have just done: 1). Replaced the exhaust Cat and Muffler, cat was clogged 2). Replaced the fuel pump and filter, last done in 2012. 3). I have replaced all plugs, wires, dist cap and rotor button and coil. 4). I pulled the fuel pump relay, opened it up, no burnt spots or bad solder joints, I think it is ok. 5). Opened all fuel lines at distributor outflow, tapped on lines, seem ok, fuel comes out. Engine starts, runs rough, will cut off. Will restart. After it warms up, it runs ok. Idle is ok. Compression is ok. We shut off engine, let it cool, 15 min, started again, same problem. What do you suggest I do next, as I am now past the point of my maintenance items and do not know where to look. Thank you. AGuess | ||
#242286 | |||
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J.R. Elite Veteran Date registered: Apr 2006 Location: Southern Maryland Vehicle(s): 00 G500, 09 911 4S, 11 Cayenne S, 86 280GE (sold) Posts: 828 | Re: 1993 M117 engine - 500GE Problem Any chance bad fuel or diesel found its way into the tank? Just some random thoughts: Does it exhibit the same problem if you jumper the fuel pump relay out of the circuit? It might not be building enough fuel pressure because of a bad fuel pressure regulator. They do go bad. I think the motor has CIS so you might check the round air plate in the fuel distributor for freedom of movement. There are also two large resistor somewhere under the hood and on my former 450SEL, they went bad causing a few problems. | ||
#242287 - in reply to #242286 | |||
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Inkblotz Expert Date registered: Apr 2006 Location: Georgia Vehicle(s): 90 300GD "Thundering Turtle II", w/ 603A turbo Posts: 3186 | RE: 1993 M117 engine - 500GE Problem You mentioned the fuel pump but how about the fuel filter. Has that been replaced? How about your fuel tank. When you open it is it pressurized? The #35 valve could be blocked and the proper amount of fuel is not reaching the engine. (valve.jpg) Attachments ---------------- valve.jpg (168KB - 0 downloads) | ||
#242342 - in reply to #242286 | |||
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hardtop New user Date registered: Apr 2020 Location: Utah, USA Vehicle(s): Posts: 4 | Re: 1993 M117 engine - 500GE Problem Check the mass airflow sensor (or replace it). Also verify spark and coil pack(s) if you haven't done that already. | ||
#242349 - in reply to #242286 | |||
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AGuess Elite Veteran Date registered: Apr 2006 Location: Holly Springs NC Vehicle(s): 93 500GE, 93 500GE, 2002 G500 Posts: 717 | Re: 1993 M117 engine - 500GE Problem When I unplug the wire connector on the EHA unit on the side of the fuel distributor, the problem goes away, the G runs well. The other thing I noticed is that my IR door opener now works again. So now, I wonder if the KE control unit is having problems. Does anyone know if the KE control unit controls things other than the engine? If it’s bad I need to find a rebuild shop as they are very expensive. Thank you Alex | ||
#242387 - in reply to #242287 | |||
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AlanMcR Expert Date registered: Apr 2006 Location: US, CA, Los Altos Vehicle(s): G300DT E300DT 230SL Posts: 3500 | Re: 1993 M117 engine - 500GE Problem I doubt the KE ECU is responsible for anything other than engine management. On the other hand, you could have bad grounding somewhere and the act of un/plugging is temporarily fixing bad connections. | ||
#242392 - in reply to #242387 | |||
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AGuess Elite Veteran Date registered: Apr 2006 Location: Holly Springs NC Vehicle(s): 93 500GE, 93 500GE, 2002 G500 Posts: 717 | Re: 1993 M117 engine - 500GE Problem Hi everyone, the problem was the KE control unit. I found two on eBay, both in the UK. One was a VDO unit, specifically for a 500GE. MB classic confirmed. I installed it last night and the 500GE runs great again. The second unit is a Bosch and matches the original part number that I removed. It is off a 500SL, which has the same engine. I am waiting on that one to arrive. I’ll keep it as a spare for my second 500GE. I appreciate all of your input and help. Trying to keep these 28 year old G’s running is quite the challenge at times. Alex | ||
#242435 - in reply to #242286 | |||
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AGuess Elite Veteran Date registered: Apr 2006 Location: Holly Springs NC Vehicle(s): 93 500GE, 93 500GE, 2002 G500 Posts: 717 | Re: 1993 M117 engine - 500GE Problem Update. I thought the KE control unit was bad, but I could not test it. I took the G to a local Mercedes shop that works on older cars with the M117 engine. It turns out that the 02 sensor was bad. They replaced it, adjusted the fuel mixture and reinstalled the original KE control unit. The engine runs great again. Thanks for all your help | ||
#242628 - in reply to #242286 | |||
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KM1 New user Date registered: Jan 2022 Location: Vehicle(s): Posts: 1 | Re: 1993 M117 engine - 500GE Problem I'm having issues with my 500GE and have narrowed it down to the KE-Control unit. Can you tell me the part #'s of what you have found, mine has the part numbers 0 280 800 276 BOSCH and 006 545 95 32 (07). I have been unable to find anything used with the exqct part number but maybe there is an updated crossover. Thanks | ||
#243341 - in reply to #242286 | |||
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Inkblotz Expert Date registered: Apr 2006 Location: Georgia Vehicle(s): 90 300GD "Thundering Turtle II", w/ 603A turbo Posts: 3186 | Re: 1993 M117 engine - 500GE Problem A quick google search yielded: https://www.bosch-repair-service.com/en/engine-control-unit/bosch/ke... https://www.autoecmstore.com/search?type=product&q=0280800276 So it looks like it was used in several different Benz Motors: MERCEDES-BENZ 300 GE [463] 125kW 08/1990 - 08/1993, MERCEDES-BENZ 500 GE AMG [463] 195kW 03/1993 - 09/2001, MERCEDES-BENZ 500 SE, SEL [126] 164kW 09/1985 - 06/1991, MERCEDES-BENZ 500 SE, SEL [126] 170kW 12/1979 - 08/1985, MERCEDES-BENZ 500 SEC [126] 164kW 09/1985 - 06/1991 MERCEDES-BENZ 500 SL Roadster [107] 164kW 01/1986 - 08/1989, MERCEDES-BENZ G 300 [463] 125kW 09/1993 - 10/1994 Time to head to the Pic-in-Pull to grab a used one to make sure you are on the right track. Edited by Inkblotz 1/14/2022 10:39 AM | ||
#243342 - in reply to #242286 | |||
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