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  #1  
Old 07-13-2008, 05:18 PM
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Join Date: Jul 2008
Location: southern Ind
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88 560sl idle and missing and hard starting

problems started out as hard starting after sitting for an hour, so I changed the fuel accumulator, did not fix
new problem also when hot, put in neutral will some times rev up to 1400
new problem also when hot, going down road, will start missing and clouds of black smoke out exhaust, then will clear and run normal, this first started as a problem after hard starting, high revs and when pulling out of parking lot, no power and lots of back smoke
help
The only other thing I have done to it is cleaned the air slide valve, Is this also called the idle control valve? thanks

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  #2  
Old 07-14-2008, 06:59 AM
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Location: Greater Metropolitan Beaverdam VA
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missing and hard

Sounds like ECU related problems. In the case of my 88 560SL, the culprit was the sensor that inputs engine temperature to the ECU. It was easy to change that accessible and relatively inexpensive sensor. Try to isolate your fault before simply changing every high dollar item in sight.

Yes; idle control valve. Cleaning it was a good thing to do.

Last edited by rocky raccoon; 07-14-2008 at 07:01 AM. Reason: add information.
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  #3  
Old 07-14-2008, 06:12 PM
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Is the ECU the computer, and which temp sensor, there are several, where is it located? thanks for your help
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Old 07-14-2008, 07:23 PM
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Ecu

Yes. ECU = engine control unit = computer.

The temperature sensor I referred to is at the front of the engine just under the leading edge of the air filter housing. It has a green body and is the one with two wires attached. The other two are for the temperature gauge and the auxiliary fan.

Remove your air filter housing to access it.

Let us all know if this works out.
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  #5  
Old 07-14-2008, 07:52 PM
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Is it in a water passage, if so, do I need to drain coolant to change it?
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Old 07-14-2008, 09:06 PM
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temp sensor

The element is in coolant but can simply be unscrewed and replaced using a wrench without losing coolant.

Understand that this may not be your problem. My symptoms were very similar to yours and it worked for me.
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  #7  
Old 07-14-2008, 09:31 PM
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Location: southern Ind
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found it, I think, will need to buy a socket to fit, it has two individual wires going to it, each with its own connector.

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