[W126 Coupe] Lumpy from idle onwards

[Dick Spellman]

Hi Dan,

I have not been following MBCopues posts of late but,  have you gone 
over the rest of the electrics?  Cap and rotor?  Did you replace the 
coil lead?

If not, inspect cap, rotor and look for arcing on the coil lead when dark.

If you feel electrics are good all around, remove the air cleaner and 
take a spray bottle with water and make wet each of the injector seals 
to see if the engine idle cleans up.
Fllow with spray on the air idle valve hose connection points that you 
can access.  Probably can't get at the intake and air meter points. See 
if there appear to be any cracks or if these hoses feel hard/brittle.  
There's actually a routine (I'll try and locate) that walks you through 
isolation for an air (vacuum) leak.

The above is just a cursory check.  Do you have a set of fuel gauges?  
These will be needed to check pressures and identify leaks.

Let me know....

Dick


Dan Gardner wrote:

> Hi Folks

>

>    Further to my last posts I have replaced the plugs again,and fitted 

> new Bremi plug leads but still the problem persists,if it was faulty 

> injectors would my exhuast gas analyser pick it up with a faulty co2 

> reading?

>

>    Its lumpy when cold,hot and throught the rev range any thoughts 

> would be most welcome.

>

>                                                            Regards Dan 

> Gardner   1986 560 SEC Euro 220kw

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