[W126 Coupe] W126 losing power

[Jonathan Hodgman]

A few things:
On 7/30/2011 6:13 PM, Tom Brophy wrote:

>

> I  a have 1985 380se, with a 1984 500sec Engine. the compression is 

> within 5lbs of factory spec on all cylinders.

>

> I have a loss of power under load [going uphill] or quick 

> acceleration, otherwise car runs smooth at a constant speed, but 

> dropped 4-5 mpg. failing smog misserably - CO emissions. replaced 

> catalytic converter 2 years ago.

>

> I'm fairly sure whatever is causing the power loss is at the root of 

> my smog woes, the emissions are about 10x higher than 2 years ago.

>

>

> What I have done --

>

> new spark plugs bosch platinum, [tested plug wires] new cap & rotor, 

> new fuel injectors w/seals, new dir replacement bosch O2 sensor, 

> checked timing adjusted fuel mixture [manually], cleaned idle control 

> valve. replaced ECU [salvage] when nothing else worked.

>


Those are the utterly Wrong plugs, get a set of NGK BP5ES's and gap them 
@ .042.
When you set fuel mixture, what did you use to verify that you are w/ in 
spec?  You may be leaning out Badly when asking for WOT.  Has anyone 
tested the warm up regulator?  If that's not working properly it will 
throw everything off...and cause a symptoms very much like you are 
seeing.  Again, some time w/ a set of CIS fuel pressure gauges will be Key.

I've also seen stuck idle constol valves cause similar problems as the 
valve no cycles through it's full stroke  Even cleaning them doesn't 
remedy the problem.

  Jonathan
http://www.blueridgemb.com
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