Did we ever figure out the "Hot Start Problem"

[alim_h]

Pics from my car if it helps any:

[mrthomas0]

well crap! ive been trying to solve this mystery for 2 months now, and here it is. i know i plugged that in when i last did a ton of work to my car. i am actually headed out to the car right now to unplug it. thanks!

[downforce22]

I had this issue and found this thread so I decided to check it out. And low and behold the wire was connected. So I disconnected it and it fixed my issue.

Thank you so much for posting and I had to register after that! Glad this is a sticky!

[Diabhalta]

I can confirm that this trick isn't working on my car. Couldn't it be faulty temperature sensor? Sending wrong signal to the ECU and the ECU thinks the engine is cold and flooding it? Also my car is a bit thirsty. More than it should be, the gauge ks going down too quickly and I won't do many miles for the amount of petrol I'm getting.

Anyway, I wanted to check the sensor today, but couldn't stick the probes into pins to see what's the story between the ECU and the sensor.

And the fuel pump died today. Strange. I stopped at motor factors for something and couldn't start the engine. I was thinking it will start after a while like always but no. Spark plugs dry, then there wasn't anything coming out of the filter when I removed the hose and put on a longer one that I put into a canyster.



this is how I got home today

[sports.racer]

I think if you have a euro-spec car (assumption based on license plate), then you don't have the O2 sensor and the wire should be connected. You've got other issues.

[Diabhalta]

Irish reg. Yeah there is no O2 sensor. I have been told in Bmw dealership to look at the idle control valve. Not sure if cleaning the ICV would fix it?

Edit:

Btw you can easily spot the year of manufacture on the plate. It's not 3121.

[sports.racer]

Then I'm going to guess 1990. Mine's a 91.

[downforce22]

I think if you have a euro-spec car (assumption based on license plate), then you don't have the O2 sensor and the wire should be connected. You've got other issues.

Agreed, that is how the wiring diagram shows it. I would recommend checking for fuel and then spark ad go from there.

[Diabhalta]

The whole time the cause of hot start problem on my car was a weak pump. I replaced the pump and now it runs fine and starts every time. The previous pump was obviously weak. Maybe faulty pressure regulator as well? It seems that the car is still thirsty even with a new pump.

[alex230ro]

ok, a have a euro spec car with O2 sensor, no cat i guess.Wire is dissconected for now,i have some hot start issues - starting at second attempt . Should i plug that connector back?