Old Trouble Back Again...

[davidsl500]

So almost to the day 12 months on the SL starts playing up again.

Symptoms : Starts immediately when cold, drives okay then as it gets up to temperature it starts to miss, gets worse and dies. Wont restart until its left for a good 30 mins then off we go again.......Does the same thing if you start it and just let it idle - warms up then misses and coughs to a halt.

I went straight to the cure this time after last years Sherlock Holmes adventure... Both Distributor Caps wet as wet can be and the terminal posts in a bad state. Beats me how there is no indication of the problem earlier - just look at the moisture and build up of crud on the terminals !
The distributor cap seals were changed last year so I am suprised the problem has returned.

All cleaned up with Servisol and now perfect again. Weird its always October when it does it - change in the weather I suppose...

 

[Ultymate]

It's a case of hot engine cooling down when you park up condensing the moisture out of the autumnal evening air you'll have to keep it treated with Servisol or WD40 this time of year, the only other thing you could try drilling a hole or holes in the cap to allow it to breathe but tread carefully if you do :!:

 

[television]

David, spray it with a PCB lacquer or/then Slick20 or any silicon teflon

Malcolm

 

[hakulmi]

I have same symptoms now! HELP

I just get my 500sl-92 to workshop. Driving 30 km in 5 hours.
I drove 10 km it stopped, next I try to start it. Then I noticed that when it cools down it works fine until motor warms again. Motor will stall and I got another hour waiting.

In summertime no problems. This came when we got first snow in Finland

Please, Can you help the foreigner in big trouble. I will check distributors first. Do you have another ideas what can cause symptoms I have?

Thanks a lot in advance.

 

[television]

It must be high voltage related,spray the HT leads with a good sealer.also the distributor cap and rotor
When I lived in Sweden, I never had a problem as the air was so dry,as it is in Finland

Malcolm

 

[hakulmi]

weather

My sl has done it now three times. (one 10 km trip it has been running without doing this) Everytime wheather has been about 0 celcius. Thanks for the comments, I will open up the hood today and check distributors and leads.

Thanks
Mikko

 

[Helmet Vonthrob]

Be careful with the various Ignition Sealer sprays and spark plug leads, what they do over time is crack which actually allows the ingress of... moisture!

Best just WD-40 all over (other maintenance sprays are available).

 

[television]

Be careful with the various Ignition Sealer sprays and spark plug leads, what they do over time is crack which actually allows the ingress of... moisture!

Best just WD-40 all over (other maintenance sprays are available).

I agree with you, the silicon sprays are the best,never dry out.

Malcolm

 

[hakulmi]

next step

Distriburs were dry and in a good shape. I do not see nothing wrong over there. Any other ideas what can cause this?
How about coolant temp sensor. Can that make SL:s symtoms.

Thanks for the help!

 

[television]

I think that your problem is the crankshaft sensor, that is the most common thing for your symptons, as you say, condensation is not a problem where you live.

malcolm

 

[hakulmi]

No condensate, coolant sensor ok.

I measured resistances from coolant sensors. Those are ok. 2.6 kohms in 20 degrees.
I started up the car in warm garage. Starting good, running good, everything likes normal. Too bad that I did not get car back outside to run around parking area. Maybe SL get problem over there, minus 2 degrees now.. Anyhow it runs great in garage. I unplug all sensors but all seems to be working. Also air temp measurement is been checked and working in 20 degrees.

Thanks Malcoln, You still think it is crankshaft sensor?

 

[television]

I measured resistances from coolant sensors. Those are ok. 2.6 kohms in 20 degrees.
I started up the car in warm garage. Starting good, running good, everything likes normal. Too bad that I did not get car back outside to run around parking area. Maybe SL get problem over there, minus 2 degrees now.. Anyhow it runs great in garage. I unplug all sensors but all seems to be working. Also air temp measurement is been checked and working in 20 degrees.

Thanks Malcoln, You still think it is crankshaft sensor?

We have had 20 or so threads on this poor or non starting, the sensor has cured it in most cases. It is effected by temperture. this is the one peice that the electronics need to know before the engine can fire. Its only a little Hall effect switch. (magnetic)

Malcolm

 

[Ultymate]

Just a thought it might be worthwile cleaning the crank sensor first as being magnetic they do tend to pick up little bits of swarf which does impare performance, particularly if they're situated at the rear of the engine near the starter and it's ring gear which on a lot of the Mercs they are. That said they are not expensive to buy

 

[hakulmi]

part number?

Sorry to bother you guys again. but do you know the part number of crank shaft sensor? If I want to replace it do i have to change or order other things too?

Thanks again,

 

[television]

http://www.detali.ru/cat/oem_mb2.as...GA=722.353&CT=M&cat=518&SID=15&SGR=075&SGN=04

If your car is a 129066 then this applies to you.

You have two sensors,1 position sensor and 1 ezl sensor,you may have to replace them both.

Malcolm

 

[television]

Been thinking,it could be the EZL item 20, more than the other one.

malcolm

 

[hakulmi]

Stupid question

I can not find the whole sensor. Can you give more detailed info how I can locate that?

Thanks
Mikko

 

[hakulmi]

EZL 20 location?

I have some sensor at the Camshaft end. Is that one EZL20?

Thanks!

Trial continues....
Today I tried to get malfunction to car. No luck, Car runs perfect all the time. I thought maybe problem is cold wheather, but no, SL was 8hours outside before starting up. It runs just great. Tomorrow I take another battery to trunk, multimeter and ignition tester. Let see is the problem on fuel or ignition? Everytime I have had this "stalls warm problem" car has been without driving at least 2 weeks. Any help on this?

 

[television]

I think that you have the EZL ignition on your car, I cant be sure which sensor it is. the EZL20 is one of them you may have to change the other one as well as I do not have the wiring diagram. One is for the ignition,the other is for injection.

Malcolm

 

[hakulmi]

Just asking: G-KAT from germany

Hello again!

I still can not get any problem to SL. Maybe it needs longer period without use before problems occures.

Anyhow I have a new question for you. Have you heard about G-Kat equipment which is installed to my mercedes. I heard that they put them in to save fuel. It is not original. It will change fuel mixing. there is one signal taken from lambda sensor. Other one is taken from temp sensor. I am planning to remove the whole thing.
Do you think it cause problems what I had?

Thanks in advance.