Car won't start on hot days

[Oli77]

News?

[WolfBMW]

Nope! All is well. My habit of parking in spots where I can roll start it on my own has not yet worn off, but we all have our little eccentricities.

[Oli77]

Duh, after rereading the thread, I now realize you had bought a new battery.

[WolfBMW]

Welp, it wasn't the battery. Guess I'll go back to trying to figure this out when I get back from Italy in 3 weeks.

[ryankokesh]

I have three guesses:

1) clutch switch
2) key RFID thingy
3) starter relay


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[az3579]

I had this exact issue last winter when temperatures were in the single digits. Only when the temps were in the single digits, the car wouldn't start on the first try. I'd try to start it but nothing would happen after turning the key. It was not the battery as that was only a few months old. I replaced the fuel pump relay, ignition switch, and another relay (forgot which one) and the car started every time afterwards. From what I'm told, these are common failure items and wouldn't jump to a battery right off the bat. If the battery was at fault, I'd think it would at least try to crank before conking out...

I'm fairly confident it was the ignition switch that fixed it for me.


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Just leaving this right here...

[ryankokesh]

Just leaving this right here...

It would crank if it were the fuel pump or fuel pump relay, no?

Good call on the ignition switch, though.


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[az3579]

It would crank if it were the fuel pump or fuel pump relay, no?

Good call on the ignition switch, though.


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Don't know. I did all the relays and ignition switch at the same time because I didn't want to spend time troubleshooting in single digit temperatures, so I just suffered once.

I did all of them because my friend says they replace them at his dealer all the time.