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#1
11-27-2003, 05:52 PM
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1986 560 SL "Quits at 6"
My BOL in Phoenix has a 1986 560 SL that flatly stops running at 6000 RPM. It will die down to about 5700 and kick in again, rips your head off in the process.
It has been checked out thouroughly Plugs, Distributor Cap, Rotor, Wiring, fuel delivery, etc, etc. It has a Jacobs Omni Magnum that has been taken out to see if that made any difference. It doesnt. Any thoughts Anyone Thanks Lee 
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#2
11-27-2003, 06:09 PM
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Some cars have a rev limiter that kicks in at a specific rpm. Maybe it kicks in at 6,000 rpm's.
I wonder why someone would drive this car to 6,000 rpm's anyway. It is not a hod rod, nor a 0-60 mph drag racer. It is a freeway cruiser. By the way, I can't figure out what "BOL" means....
__________________
Paul S. 2001 E430, Bourdeaux Red, Oyster interior. 79,200 miles. 1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".
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#3
11-27-2003, 07:16 PM
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What RPM are you trying to attain?
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#4
11-27-2003, 09:14 PM
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Quote:
My Toyota MR2 Turbo runs out of pull at 5,500 despite the 7,000 redline. 6,000 is a lot of revs for a street car. Last edited by CDNC36AMG; 11-27-2003 at 09:34 PM.
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#5
11-27-2003, 10:18 PM
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Sounds like a rev limiter to me. I don't know the mileage the car has on it, but that is a helluva lot of stress to be putting on an engine that old. On GM products, the fuel pump is shut down which causes this.
~D.J.~
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#6
11-27-2003, 10:31 PM
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Those old M116's and M117's can take the strain no problem! As long as the timing chain hasn't jumped a guide rail.
The 6K rev-limiter, if you hit it at full throttle, will indeed break your neck. Especially in a 560. 6K is the limit. No more, no less. I drive my cars like that, diesel and gasser alike, all the time when I get the chance. Keeps 'em healthy and strong. Just keep your engine athletic, and it will last a long time.
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1987 300SDL (324000) 1986 Porsche 951 (944 Turbo) (166000) 1978 Porsche 924 (99000) 1996 Nissan Pathfinder R50 (201000)
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#7
11-27-2003, 11:25 PM
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If I remember properly, the distributor rotors for those cars had a centrifically(sl?) operated shorting switch on the rotors to deactivate the igintion on those and other engines back then? Hell, back then, our 617 diesels redlined at about the same RPM's as a lot of v8's
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#8
11-28-2003, 12:23 AM
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Here's the M117 450's redline.
 Pretty close to the diesels I'd say. 
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1987 300SDL (324000) 1986 Porsche 951 (944 Turbo) (166000) 1978 Porsche 924 (99000) 1996 Nissan Pathfinder R50 (201000)
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#11
12-03-2003, 08:59 AM
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The limiter is in the fuel pump relay. It you pull off the fuel pump relay and you will see it says around 6000 1/min. This limits your engine from revving high. The fuel pump relay locates behind the kick panel on the the passenger side.
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kctme
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#12
12-05-2003, 03:58 AM
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Yes, the rev limiter is in the fuel pump relay, but on a 560SL, that relay is behind the glove compartment.
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Mike Heath 1988 560SL Black/Palomino 1988 300SEL Black Pearl/Burgandy 1984 500SEC Anthracite Grey/Palomino
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#13
12-13-2003, 03:57 PM
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fuel pump relay
Get a fuel pump relay for german model. That'll let you rev higher because engines have higher output.
 boili
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