[Mdoc111]

2000 E320 with approximately 384k miles. I’m having trouble getting it to start when cold. It could take 3 try’s or 20 try’s before it will start. It runs fine after it’s started and will start fine for the rest of the day. Just after it’s sat overnight or after several hours I have this problem. I’ve replaced the key, cam shaft position sensor, crankshaft position sensor and fuel filter. IVe hooked up fuel pressure gauge to fuel rail and I get 60ish when running and it will drop down to 40ish when turned off. Any ideas on what could be the reason for the long starts. I feel like I’m going to have to replace the starter soon if I don’t get it figured out. Thanks!

 

[gevange]

How is the battery?

 

[Witek_M]

Start with battery test. After overnight rest with engine and oil cold starter may have trouble spinning engine to 400rpm.

Ancel BT500 battery tester

Duracell H8 battery is just two months shy of being 5 years old. Installed February 2018. This time I am using Ancel BT500 battery tester. Bluetooth device. Battery test. Vehicle has not been driven for over 48 hours. I had to start it to back out off the garage to open both rear doors and...

www.benzworld.org

Ancel BA101 battery tester.

In recent times due to situation we are in a lot of vehicles suffer from dead batteries. Not enough use, poor maintenance and/or neglect. W210 is relatively simple but not immune to attempts to starts with low battery. Damaged smart keys, damaged alternators, damaged control units may result...

www.benzworld.org

 

[dmckee150]

Thanks, I swapped the battery around with my other "running" W210 and same result. It will act like it wants to start but won't catch. Also, I can smell gas coming from the exhaust.

 

[Witek_M]

Thanks, I swapped the battery around with my other "running" W210 and same result. It will act like it wants to start but won't catch. Also, I can smell gas coming from the exhaust.

Are you running multiple accounts?

 

[dmckee150]

Ha! I guess I am. I started thread on my phone, then got on my computer. Thanks for noticing!

 

[Mdoc111]

Don't remember starting the dmckee150, but who knows with me!

 

[Witek_M]

Don't remember starting the dmckee150, but who knows with me!

Ask admin to merge accounts or you will get spanking.

 

[Witek_M]

2000 E320 with approximately 384k miles. I’m having trouble getting it to start when cold. It could take 3 try’s or 20 try’s before it will start. It runs fine after it’s started and will start fine for the rest of the day. Just after it’s sat overnight or after several hours I have this problem. I’ve replaced the key, cam shaft position sensor, crankshaft position sensor and fuel filter. IVe hooked up fuel pressure gauge to fuel rail and I get 60ish when running and it will drop down to 40ish when turned off. Any ideas on what could be the reason for the long starts. I feel like I’m going to have to replace the starter soon if I don’t get it figured out. Thanks!

Observe fuel pressure for a longer period. If it drops fast it is usually check valve in fuel pump. If it drops slowly it could be leaking injector. It would explain long cranking time and fuel smell from exhaust.

STAR TekInfo

 

[Mdoc111]

Thanks for all the replies. It turned out be the coolant temperature sensor.

 

[mrboca]

Thanks for all the replies. It turned out be the coolant temperature sensor.

How did you find out ? Any fault codes? Observation?

 

[Mdoc111]

How did you find out ? Any fault codes? Observation?

I noticed that my temp gauge was reading 100 degrees when engine was cold. It hadn't ran in a couple of days. So I did a little research and read where it could cause hard starting. So, I swapped it around with my running E320 and the it started.

 

[Witek_M]

I noticed that my temp gauge was reading 100 degrees when engine was cold. It hadn't ran in a couple of days. So I did a little research and read where it could cause hard starting. So, I swapped it around with my running E320 and the it started.

This is international forum. Mention 100C or 100F.

 

[mrboca]

I noticed that my temp gauge was reading 100 degrees when engine was cold. It hadn't ran in a couple of days. So I did a little research and read where it could cause hard starting. So, I swapped it around with my running E320 and the it started.

Good observation. Withe the high coolant temp reading, the ECU will not provide fuel enrichment when the engine is cool. This causes hard starts and rough running during start.