Idle problem thats driving me nuts!!!

[sennaclass65]

Please help! i have a mercedes e220 w124 , serviced myself a month ago, engine oil , spark plugs air filter and fuel filter, drives lovely until you start to slow down for lights or junctions it goes below 500 revs and cuts out , re starts no problem, also when in reverse it surges and the rev counter goes up and down like a honeymooners bed. I ts starting to get worse the more i use it , its driving me nuts now please help!

 

[television]

Sounds like a vacuum problem to me, why not replace them all, so cheap from a indoor fish tank shop.

http://www.detali.ru/cat/oem_mb2.as...GM=717.413&CT=M&cat=19K&SID=14&SGR=125&SGN=05

 

[Ellsy Tanners]

As Malcolm, Check all over the inlet manifold for broken or split vacuum pipes and hoses. There are also rubber bungs which may have been knocked off or damaged.

 

[sennaclass65]

Thanks gents for your advise , done what you said checked the hoses pipes, all look intact and good condition to me , cleaned what i could , but it has nt made a difference , the car is surging and still cutting out any tips!

 

[jibcl500]

Is your oil level ok, not overfilled..

jib

 

[sennaclass65]

As it happens i checked the oil , it did seem a bit too much in there, its over the max mark on the dip stick, only a fraction though

 

[sennaclass65]

Yes checked the level of the oil this morning its bang on the max , would this make a difference, any other suggestions please thanks

 

[Bolide]

It always seems to be the throttle body that causes problems with E220s

Nick Froome
www.w124.co.uk

 

[sennaclass65]

I dont know if this would affect the idle in such a big way , but i do have a blowing exhaust somewhere on the front and the middle box is blowing aswell would this affect the idle?

 

[vijilants]

I second that on the throttle body.....unfortunately, they can be quite expensive new.

 

[sennaclass65]

Ok update , ive cleaned the inside of the throttle body , no difference , i have changed the whole exhaust system from front to rear (needed changing anyway)no difference, its actually getting worse now , theres not enough tick over to move off when stopped , shes drives perfect when on a run , so the next thing i m changing the throttle body as advised above , hope this works many thanks !

 

[crammy69]

Have you checked the Electro Hydraulic Actuator (Govenor) on the back of the Fuel Distributor? is theres petrol leaking there it may need new seals. Sounds similar to an issue I have been having but given Im still going through the motions with my issues, I cant be sure!
Cheers

 

[pjr]

Hi There I had similar problems. on my 300e saloon 88
Today my excellent mechanic took off the Jettronic petrol injection distributor head.

Underneath the head unit is the rubber intake boot.
The rubber had broken down ( I could just push my finger through it) so when the engine is hot it sucks in air and it stalls. He said he has seen it on 4 models he has done.
SO take or get someone to take off the injection dist head , remember to loosen the injector pipes , and ease it out, check the rubber boot. Good luck
BTW has anyone got one of these rubber boots as I need one NOW !!!
Peter

 

[kth286]

sennaclass65

You should be getting the codes read BEFORE you do anything else.

Go from there, depending which codes (if any) are showing.

I can read the codes for you if you are anywhere near Berkshire.

The 2 previous posts are not the same layout as your car, so not applicable, so don't go looking for those parts in your engine bay.

 

[crammy69]

sennaclass65

The 2 previous posts are not the same layout as your car, so not applicable, so don't go looking for those parts in your engine bay.

Sorry!:Oops:

 

[sweeper]

Ok update , ive cleaned the inside of the throttle body , no difference , i have changed the whole exhaust system from front to rear (needed changing anyway)no difference, its actually getting worse now , theres not enough tick over to move off when stopped , shes drives perfect when on a run , so the next thing i m changing the throttle body as advised above , hope this works many thanks !

Check the fuel pressure, too high and the engine will run rich, affecting idle more than anything. Had this problem on a porsche.
does the set up on your car have a mechanical airflow meter? if so this could be sticking or faulty (had this problem on an old cavalier)

 

[mattkh]

Sounds like a vacuum problem to me, why not replace them all, so cheap from a indoor fish tank shop.

Hi
Wont these ones collapse because of the vacuum.

 

[mr rosher]

Please help! i have a mercedes e220 w124 , serviced myself a month ago, engine oil , spark plugs air filter and fuel filter, drives lovely until you start to slow down for lights or junctions it goes below 500 revs and cuts out , re starts no problem, also when in reverse it surges and the rev counter goes up and down like a honeymooners bed. I ts starting to get worse the more i use it , its driving me nuts now please help!

if it was ok before you carried out the service, then it may well be the wiring loom, the w124 suffer a lot from the wiring once its been moved, E,G ( changed plugs ) the wires seam to break up under the sheath causeing shorts,
im not sure if this problem includes your modle buts its worth a look

 

[sennaclass65]

Ok fitted a replacment thottle body today , and guess what no difference, it still cutting out when approaching roundabouts or bends, so i m changing the mass air flow meter tomorrow and see if that makes a difference .

 

[anyweb]

i dont know if your car model has an OVP (over voltage relay protection) but if it does then the odd revving of the engine could be down to the ovp (at least it was on my car/w202)

if that isn't an option then look at your wiring harness


cheers
anyweb