Reliability 560SL - Page 2 - Mercedes-Benz Forum
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post #11 of 28 (permalink) Old 07-18-2018, 09:28 PM
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My 450SL does the same thing. Nothing to worry about.
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post #12 of 28 (permalink) Old 07-18-2018, 09:38 PM
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Originally Posted by Quanta2 View Post
Thanks for the good advice. I have a newbie question. On my 560, if it fails to start on the first try, the starter will not engage again unless I turn the key to the off position first, then rotate to start again. Is yours like this? Or is this something wrong with mine?




It's a German thing, seen the same in VWs and Porsches of the era
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post #13 of 28 (permalink) Old 07-19-2018, 04:29 AM
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Originally Posted by Quanta2 View Post
Thanks for the good advice. I have a newbie question. On my 560, if it fails to start on the first try, the starter will not engage again unless I turn the key to the off position first, then rotate to start again. Is yours like this? Or is this something wrong with mine?
That's not a bug, that's a feature. Older Mercedes have a mechanical interlock to prevent the key being turned to the start position a second time unless it's turned all the way off first. Later ones with Drive Authorization Systems (those fancy electronic keys) don't keep you from turning the key to the start position, but since the start is done entirely under computer control, it will simply refuse to attempt another start unless you turn the key all the way off.

"Engineered like no other car in the world." That's both a bug and a feature.
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post #14 of 28 (permalink) Old 07-19-2018, 05:11 AM Thread Starter
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Thatís a relief!
Thanks
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post #15 of 28 (permalink) Old 07-19-2018, 05:55 AM
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Eventually the car died and wouldn't restart. Finally found a working ECU that matched the 1 in the car. Replaced ECU. Car works fine now. There are a couple members here who might have one. But check everything else first. Also, you have to check the voltage to/from EACH terminal (pin) on the ECU. I don't think there's a relay that feeds it. Also, if the ignition has a fault, the ECU would work only when the ignition switch is fully functional. Ignition switch and circuits are easier to trace and less expensive to fix. If there is low voltage to 1 or more of the pins on the ECU, trace those circuits 1st and make any repairs. If none of the repairs help, or if there are no faults in the circuitry, it's the ECU.
The 560 has a totally different system. Yours is electronic injection. The 560 is not. There is a relay for your ECU. On the '73 t is the second one down on the right side of the relays just below the FP relay. Probably the same on yours. Your ECU is on the firewall, the 560 has a different type below the right side floor under the carpet.
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post #16 of 28 (permalink) Old 07-19-2018, 06:23 AM Thread Starter
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Hey thanks Rowdie! On the 560, the ECU is under the carpet? And is there an ECU relay feeding it? Thanks again!
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post #17 of 28 (permalink) Old 07-19-2018, 07:29 AM
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I should have said it is under a plastic cover under the carpet.
I don't know about a relay. Maybe it is in the online manual wiring diagram.
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post #18 of 28 (permalink) Old 07-19-2018, 08:17 AM
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Originally Posted by isthisdave View Post
It's a German thing, seen the same in VWs and Porsches of the era
The idea being that (with such a quiet engine) you don't try to start a running engine. Lesser cars would give you that unpleasant scraping sound of the stater gear trying to mesh with a turning flywheel.

I am trying to teach my teenage kids that they need to LISTEN to the engine starting before then releasing the key, unlike our modern cars where it is all done by the computer, you can flick the key (my son) or just hold hit there for 30 sec (my daughter). Old cars are just sooooo complicated - whatever..
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post #19 of 28 (permalink) Old 07-19-2018, 08:53 AM
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Quote:
Originally Posted by rowdie View Post
The 560 has a totally different system. Yours is electronic injection. The 560 is not. There is a relay for your ECU. On the '73 t is the second one down on the right side of the relays just below the FP relay. Probably the same on yours. Your ECU is on the firewall, the 560 has a different type below the right side floor under the carpet.
Thanks for the info Rowdie. That was my experience.
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post #20 of 28 (permalink) Old 07-24-2018, 03:54 PM
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You mentioned that you replaced the old tires but did you replace the other old rubber items such as hoses and belts? For a car that old (I owned one) rubber does not get better with age and blowing a hose of belt at speed is not recommended and will downgrade the reliability factor. I'd replace all!
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