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1989 300SE
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94 Posts
Discussion Starter #1
I was doing some maintenance and decided to check the condition of the throttle body and noticed a puddle of fuel under the throttle plate. Is this normal? If not, what could cause this?
Also, as I depressed the airflow meter vane, more fuel seemed to roll down to the throttle body plate. (There has been no excess fuel smell. However, the car does run a little rough until normal operating temperatures.)
 

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1991 500SEC 55K mi. 1987 560SEC Now 153K mi. 2020
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Hi 500Kelvin,

"to check the condition of the throttle body and noticed a puddle of fuel under the throttle plate. Is this normal?" I don't think so, from what you say. Sounds to me it is likely that there is a leak from either the cold start valve or an injector or 'two' that is dribbling/dripping downwards into the throttle area. **True only if the the air flow sensor plate was undisturbed prior to your discovery.**

"Also, as I depressed the airflow meter vane, more fuel seemed to roll down to the throttle body plate." I would consider this a normal condition for this reason:

As the airflow sensor plate is pushed down any fuel pressure left in the system (rest pressure for instance) will activate the fuel injectors until this fuel pressure drops below the opening pressure of the injectors.

[:)] MBL
 
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