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I have a '91 164L. When I start the car for the first time in the morning it fires right up. However, later in the day I need to hold the gas peddle to the floor to get it started. What would cause this ?

Thanks - Terry
 

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I have a '91 164L. When I start the car for the first time in the morning it fires right up. However, later in the day I need to hold the gas peddle to the floor to get it started. What would cause this ?

Thanks - Terry
I've had this as well in my last 164.
Here are some ideas.

- Leaky injectors. I'm told that these can flood the engine after shutoff. Perhaps remove the injectors and have them cleaned/tested?

- Coolant temperature sensor. If faulty, the injection system thinks the engine is 'cold' when it is hot, and injects too much fuel.

- Normal behaviour. It does say in the handbook to press the accelerator pedal if the engine does not start...

Others will have some more specific advice but those are the things that come to mind first.

Cheers,
-Alex
 

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Do you really have to hold it to the floor, or just give it a little throttle blip? Does the fuel level in the tank make a difference? When it is low on fuel is it harder to start?
Charles
 

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Discussion Starter #4
Fuel level in the tank does not matter.
I have not tried a "blip" but this is something that just started. Prior to this problem it would start up without any assist.

Terry
 

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Try clean the CTS (Coolant Temp Sensor for Motronic - the one hidden under the radiator hose) connector first! Poor connection increases resistance and the ECU thinks it needs more fuel.

You can try to measure the resistance of the sensor when the engine is hot. Not easy to do since the engine is HOT! You can take out the retaining wire clip when the engine is cold so you can pull out the connector easier. A spare connector that let you measure at the other end of the wires can help too. Hot resistance should be around the 200-300 ohms range.
 

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Check that coolant temp sensor for mositure in connector or broken wire/slipped terminal in Bosch connector under rubber boot.
 
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