Hi There 94 W124 300D - Tickover problem

[iamamanc]

To start with I've not been here for a while so hello again

My problem is this
I have been searching this and other forums and I can't seem to nail this one down.
I have just bought an early 94 W124-131 300D 24 valve (OM606) straight 6 engine and am trying to find the ELECTRONIC IDLE SPEED CONTROL Part # 0075459632. Some forums report it as being behind the battery, there is only fresh air there. Does anyone know where it should be.
Plus the tacho isn't working. The alternator is new, I thought that may cure the tacho but nope. I have read that the Idle speed control may have something to do with this.
Compared to my other 300D the idle is very low so I'm hoping this will kill two gremlins with one brick.

Also the engine runs on for about 2 seconds when I switch it off, hot and cold

Any ideas anyone, I have a few days off work so this would be the ideal time to sort it

Happy New Year
Adrian

 

[television]

http://www.detali.ru/cat/oem_mb2.as...GM=717.433&CT=F&cat=15S&SID=54&SGR=040&SGN=03

Hello its item 079 in the above link. have a nice day.

Malcolm

 

[iamamanc]

cheers TV
Had a look there. There is one long one which I guess is the multi relay and another one about half the size. Couldn't shift it though so I'm gonna wait till the morning and have another go. Is there a trick to getting these buggers out
Cheers

 

[mattkh]

over run

Also the engine runs on for about 2 seconds when I switch it off, hot and cold. Any ideas anyone,Adrian

Hi

Leaky injectors.

 

[Stircrazy]

cheers TV
Had a look there. There is one long one which I guess is the multi relay and another one about half the size. Couldn't shift it though so I'm gonna wait till the morning and have another go. Is there a trick to getting these buggers out
Cheers

What are you going to do when you get it out?

Have you got a replacement?

 

[iamamanc]

Give it a rattle and shake, clean the contacts, replace it.
See if it has done anything to change the gremlins - Is there a way to test them to see if they are working right??
No replacement as yet but I'm sure I can find one
Cheers

 

[iamamanc]

Leaky injectors.

That's it??
Or is the first thing to check

 

[Parrot of Doom]

The engine running on problem could also be a failing fuel shutoff valve.

 

[Parrot of Doom]

That's it??
Or is the first thing to check

Take the engine cover off, check for puddles of diesel in each well. Of course this might also be a leaky fuel spill pipe but thats very cheap to replace.


Be careful around the yellow fuel pipes, once disturbed they tend to start leaking because the O-rings are hard and mis-shaped. The O-rings can be bought direct from Bosch, but I don't have the part number. The fuel lines are cheap enough from Mercedes anyway.

 

[iamamanc]

Cheers for that Mr Parrot

 

[Bolide]

They idle very slow as standard. I wouldn't worry unless the idle is uneven

The running on will be the shutoff valve not operating quickly. I'd ignore it till it stops working altogether. It's pneumatically operated so pipe leaks are the things to look for. Heed PoD's warning about fuel pipes - air in those is a headache

Nick Froome
www.w124.co.uk

 

[iamamanc]

Took it to a diesel man who is older than my Dad and really know his stuff. He said the chain needs changing, and he was adamant. Smoke at start up, idle shudder, not shutting off right these are all classic symptoms. He took a vacume pipe off the pump and sucked it and said that the shutoff valve is ok. Checked the engine mounts, again ok. He has nothing to gain from his advice cos he doesn't want to do the job. All he does is rebuild pumps so I have no reason to doubt him. So looks like a new chain - gulp - but then I should have a cracker of a motor.
Happy New Year all
adrian

Ps AM I right in thinking that the valves are self adusting on the OM606. Plus getting the injectors out - hot engine or cold whadaya think cos I dont want to sheer one off in the head. I once sheered a spark plug off in a Nissan, thank God I had a mate with a workshop and all the tools but it was still a swine of a job

 

[Bolide]

How many miles has the car done?

A new chain & tensioner from Mercedes is about £120. If you're going to change it I'd do it first and do the injectors later so you know where the problem(s) lie

You are likely to disturb the fuel lines when working on the car so seach this forum for "diesel air leaks" to know how to solve that problem

The engine has hydraulic tappets so no adjustment needed

Nick Froome
www.w124.co.uk

 

[iamamanc]

Cheers Nick
It's done just over 100k. The pump guy said that is irrelevant, especially when I didn't get any history with the car - was it used or abused. It looks good but as we all know looks can be deceiving. Anyway within the next couple of weeks we should get this done. New chain new nozzles timing bang on, gonna do the mounts as well even if they don't need it. I'll make a good un out of this baby yet - It's too nice a car to let it just go.

Cheers

 

[Bolide]

If it's a 1994 with no history then I'd say it doesn't have 100k on it - more like 200. But that's not a disaster

The 606 is a good engine. Some suffer from feeling very flat and I suspect it's due to loss of compression. . There are lots of valves to lose compression past... Non-functioning inlet manifold vacuum systems play a part here as well. And badly-adjusted kickdown cables don't help

If you have the head off bear in mind you'll need 20+ new stretch bolts and a new head gasket. If you go that far you might as well retip the injectors & replace the glowplugs. I've heard of cams snapping on earlier diesels so I'd be careful if you have to remove them. I believe there's a hole in the injection pump to take a 4 mm drift to lock the pump timing when at BDC

Nick Froome
www.w124.co.uk

 

[iamamanc]

Hi Nick
I'm not sure about the 200k and/or loss of compression - I mean when it's going at over 1000rpm it's really sweet. Lots of pull on the flat, the acceleration and pick-up on hills really suprised me. It's just that first 700 to 1000rpm's that is causing me a little concerne. I also have a 91 300D with the 603 engine that does have 200k under it's belt so a comparison tool is there. For sheer power and grunt the 94 wins hands down.
Would Merc tell me the service history and milage of the car from their records if I asked them? The car was on private plates untill this year so maybe it was serviced at a Merc shop
I have attached the HPI I requested when I bought the car and a pic of the beast as well, how accurate are they concerning milage - anyone know

Cheers

 

[Andy Cottrell]

Hi,

Not sure if this is relevant if you are going to change the chain but on my 94 E300D, there is an electrical connector at the very rear of the pump . It is a pain to get to as you really need to remove the intake pipes from the inlet manifold to see it, however, removal of this connector causes the idle to drop on mine to about 500rpm, re-connection brings the idle back to about 650. I appreciate that your tacho is not working so it is difficult to judge, but the engine obviously vibrates a lot more with the wires disconnected.
May be worth a try if you have time.

 

[iamamanc]

Cheers for that andy

 

[Bolide]

According to the Bentley book the E300 D has electronic idle stabilisation so logically that connector would be part of it. I wonder where the brain is? I suppose I should know...

Nick Froome
www.w124.co.uk

 

[iamamanc]

"I wonder where the brain is?"

Same place as mine I guess


cheers