Cold Start Issue when weather is hot o only !
 

Hi,

I have a strange problem , need help !

- Engine Cold , weather Cold ( under 16 degree celsius ) > Engine starts immediately

- Engine Hot , weather COLD or HOT > Engine starts immediately

PROBLEM : Engine COLD weather HOT > 2 cycle of 5 - 7 seconds needed to start the engine, rich condition present


W/hat I did :

I changed the

- Engine Coolant Temp sensor
- Intake Air Temperature sensor
- Crank Position Sensor

RESULT : NO CHANGE !

is there a specific " COLD START CIRCUIT " in our cars ? my car is 1996 Daimler Six lwb,

maybe , an element of COLD START CIRCUIT different from listed above is the source of problem ?

Check valve in the fuel pump body can bleed off the fuel charge in the fuel rail between runs requiring a bit of time to get the operational fuel pressure to the rail . This may account for the fuel smell as the underfueling at the lower pressure may not be lighting off and may be pushed down the exhaust . By the successful restart a short time after shutting down may also point to this check valve as it slowly bleeds off the trapped pressure . An easy way to check the check valve is to crack open the fuel line fitting on the fuel rail B nut after say an hour after shutting down .

Camshaft sensor ( code P0340 ) may be inop at higher temps causing a longer start sequence as it reverts over time to the Crankshaft sensor .

Do you get the initial 4 second fuel pump on then off priming the fuel rail before the ECU sees engine rotation . 3 clicks total on the fuel pump relay On - Off - On . The first 2 clicks will accrue with the key in the on position only before the start position .

Clean the connectors well on both the Crank and Cam sensors

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