Question about 1987 Mercedes-Benz 300-Class

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Cold start valve problem

Hello, I have 87 300e , the cold valve injector keeps spraying fuel inside intake, everytime the engine is at normal oparating temp. cousing to flatt the engine resault hard time starting long crank. If cold starts no problems. I have replaced fuel pump relay, fuel accumulator, injectors, temp sensors,check valves,fuel pumps,cold valve injector,over load protection relay so far no luck still the same problem. Do you have any ideas what it could be please? Thanks.

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  • jam72584 Apr 15, 2009

    I also have a cold start problem, the car takes 3 cranks now to start. Is it the cold start valve

  • Anonymous Mar 16, 2014

    Hi please help i have a jetta2 16v i needhelp on the wiring for the heat sensors n oil sensor n how to connect the computer box n the cold start valve with the thermo time switch all wiring have been cut by t mechanic please help me

  • Anonymous Mar 17, 2014

    Replaced-fuel pump, efi relay, cold start injector, still no run. fires right up with a shot of starting fluid, but only for a few seconds. suggestions?

  • Anonymous Mar 24, 2014

    sometime it will start when it does it runs all day no problem when it does not start I look at plugs they are wet with fuel could it be a crank p sensor or cold start injector

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If you have an electric cold start valve make sure to unplug it and if keeps apling fuel with electrical conector unpluged that means the valve is not good, but if not then you have an electronic problem, possible a bad cold start sensor or cold start module or cicuit problem, and might be a time to take it to an electrical shop

Posted on Jun 17, 2008

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Is this the problems from the injectors or crdi

Posted on May 28, 2013

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Sounds like too much fuel, could be a leaking injector, faulty pressure regulator, or blockage of air intake. Did you replace the injectors and pressure regulator when you worked on the throttle body ? Can you see normal fuel spray on both injectors when the engine is running ?

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if I'm reading this right...
... the engine starts and dies within a few seconds.
... you jumpered the fuel pump test connector and it will keep running.
... you smell fuel after trying to re-start when it dies.

Disconnect the plug to the cold start injector. Even if you have an issue with the engine running then dying after a few seconds after doing this, if you don't smell fuel after disconnecting the cold start injector and try to restart it, the cold start time injector time switch may be failing.

Buy a can of starting fluid and have someone start the engine then spray short bursts of the fluid around all the intake fittings. If spraying the fluid in any particular area keeps the engine running, I'd start looking for leaks around that area.


It does sound like an AFM or COR issue considering it dies after a few seconds, but the fuel smell when trying to restart the engine may be a separate issue that needs corrected / isolated first.it will keep running.

... you smell fuel after trying to re-start when it dies.


Disconnect the plug to the cold start injector. Even if you have an issue with the engine running then dying after a few seconds after doing this, if you don't smell fuel after disconnecting the cold start injector and try to restart it, the cold start time injector time switch may be failing.


Buy a can of starting fluid and have someone start the engine then spray short bursts of the fluid around all the intake fittings. If spraying the fluid in any particular area keeps the engine running, I'd start looking for leaks around that area.


It does sound like an AFM or COR issue considering it dies after a few seconds, but the fuel smell when trying to restart the engine may be a separate issue that needs corrected / isolated first.

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