fazxs

I've been facing this issue over a month and is quite baffling. My car starts perfectly in the mornings/evenings and cooler weather. I park my car out during the day at office and I does get hot over here. When I try starting the car at noon time, it wouldn't start. I turn off the car and try again and again. Sometimes it starts in 3-4 tries and like today it was very hot outside and it took me 20 tries to get it started.

This issue is only when car is parked out directly under the sun and the outside temperature is hot. I use this as a daily driver and never has this issue happened anytime in the morning/evening time. On cooler days, it would start just fine no matter how long it is parked outside. Winter just got over here and the heat is in. Any thoughts? I also wanted to add, this happens when engine is cooled down and the weather is hot.

Battery checked - its fine
Could it be something to do with the Crank Position Sensor? I hope someone can help as I'd like to get this fixed otherwise the car will become pretty useless due to the hot weather.
Starter motor - Not sure this could be the problem as it starts absolutely fine most of the time.

Dokus

A bad cankshaft position sensor can give you this issue.

almostordinary

Off topic, but are those secondary DTRL covered in a film, or are those yellow lights?

I have Yellow Fogs, and that secondary yellow light looks great.

fazxs

Just wanted to update this thread. As mentioned in my opening post the issue was weird and no error codes. I had replaced the CPS and that didn't fix the problem. I learnt to live with the problem and got used to several tries to start the car. The starting problem started even in colder days and mornings wherein earlier it was only during hot weather.

Recently, I replaced the engine oil level sensor (as in the thread below) to fix the issue of M mode not working on transmission as may members here have tried and it has worked for them.

https://mbworld.org/forums/w211-amg/...ml#post3847486

This didn't fix the transmission problem as M still upshifts top the next gear immediately as soon as I lift off the throttle. But what it fixed is my staring problem!! I have been driving the car for about a month and it cranks up like it always should. I'm not sure how the engine oil level sensor maybe related to my original problem, sure did fix the problem. I'm glad I didn't take the advise of the mechanics here who were telling me to replace the starter motor and the cycle of replacing something that's not broken.

cdk4219

That’s odd, as my oil level sensor has not been working for years, and I don’t have a crank no start problem.