w124 hesitate to accellerate - MBWorld.org Forums

Dec 17, 2010 | 03:07 AM

kingclassic

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w111 w124

w124 hesitate to accellerate

hi everybody,
my car hesitate to accellerate!she do ok with new sets of spark plugs but after a few day the same problem arise again!
Me car is a 91 model with EZL ignition system.I have replace auxilliary idle valve,fuel valve,overload relay.
fuel pump,fuel relay tested ok.please help!!!

Dec 17, 2010 | 03:42 AM

Saijin_Naib

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1990 300ce 24v I6

Rotor and distributor cap? What about spark coil?

Dec 17, 2010 | 06:57 PM

kingclassic

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w111 w124

rotor arm renew as well and distributor cap checked.sometimes the motor fluctuate during idling.sometimes it fluctuate when the air conditioning switched on.when decellerate the engine stall!!

Dec 17, 2010 | 08:35 PM

Quicksilver500

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1992 Mercedes-Benz 500E

Could be an injector that has a bad spray pattern. New plugs might ignite something real rich like that. Was the fuel distributor real dirty on the inside?

Dec 17, 2010 | 09:49 PM

kingclassic

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w111 w124

hi,
tested the cold start valve,it works fine.the air flow sensor and everything in there is clean.injector spray pattern?how to check it?
me workshop manual did mention "only a small amount of fuel should
be visible"after building up fuel pressure and i depress the sensor plate.

but how small?i notice fuel flowing when i push down the sensor plate.
please help me!!!

Dec 17, 2010 | 10:06 PM

ryanpro50

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w124

depending on what motor you have, they are horrible for valve guides wearing out causing plugs to foul. Is there a burnt oil residue on the plugs? what do the plugs look like when you pull them out?

Dec 17, 2010 | 10:41 PM

kingclassic

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w111 w124

motor is good!no sign of burning oil.the plugs are all light brown!after a few trip the spark plugs produces slightly reddish spark!I know over fuelling could kill a spark plug.but at which point of the fuel system?
fuel distributor which holds the control plunger and seals are the only place i havent check.As i say,the amount of fuel flowing after i build up the fuel pressure should be how small?
flowing?or vapour only?

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