[W126 Coupe] Fuel Injectors

[Dick Spellman]

Hi Henry,

There are a number of diy tests and if they don't resolve the problem, 
you will need a fuel pressure gauge set-up that permits the correct hook 
up to the upper and lower chamber on the fuel distributor.

Before you go into the fuel system diagnosis, can you better describe 
the problem.  Stumble as in miss only at idle?.  Stumble on 
acceleration?  Miss at speeds?  Rough idle on cold start or only when 
engine warms  and so on.  Also, can you feel the motor vibrating at idle 
in park by finding a safe spot to place your hand on say the passenger 
cylinder cover.  Just avoid the spark plug leads.  When was the last 
time the motor mounts were inspected?  At what point do you get the 
engine to smooth out?  Again with engine on, car in park, hand on the 
cylinder cover, locate the control linkage behind air cleaner at 
firewall and move it to gradually increase rpms.  You can have another 
person in the cabin do this too and with greater accuracy read the tach.

Dick

On 11/24/2010 5:00 PM, Henry Viveiros wrote:

>

> Thanks, Dick, I'll check the cap, rotor, & plugs.

>

> If that reveals nothing, what do I do about the fuel, etc.?

>

>

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