BMW N20 (Z4) No Start When Hot Fix

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My BMW Z4 has suffered from bad starts when warm even since I swapped the engine. It has been a 2 year journey of me trying to fix this hesitation on starts and after trying over 15 different things, I finally solved it! An engine that is hard to start when hot is a different item to troubleshoot as it can be so many different items. It could be a bad high pressure fuel pump or the fuel pressure sensor, it can be related to electronics where the crankshaft position sensor is fault or the camshaft sensor is sending false data to the DME. It can be as simple as a loose ground or positive wire on the engine, starter or the alternator and even injectors can make a huge difference to how an engine starts. On this BMW N20 engine, resolving the hard to start when warm was accidental and nothing I would even look for without changing the starter as a result of failure. Hope it helps you troubleshoot you BMW engine start problems as well!
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[@SimpleCarGuy]

BMW Z4 Full Speaker and Subwoofer Upgrade DIY: kzbin.info/www/bejne/Z53FfYZ7dseph7s

[@americaautosaleinc8985]

We sold this car in auction and yes I did replace the starter because I have start issues with it dam glad u fix it

[@SimpleCarGuy]

Wait, are you saying you owned this exact car?

[@KiesMotorsports]

Glad you got it!

[@SimpleCarGuy]

Me too!

[@NarenPatel]

It’s the little things that get you. Great work you did a ton of work on that car. Happy you got it resolved.

[@NarenPatel]

Btw I have a 2011 35is in the central nj area. Happy I found your channel as not too many people with this car around.

[@craigflipiak8083]

That is crazy. It always seems to be something simple or never would guess after spending all the hours and money for being something we would never guess the issue. Sorry you had to go through this. 😢

[@Krowicki]

Your patience with this issue is crazy. It's always important to make sure the new parts that you have are actually good. I got a defected blower motor from an OE BMW supplier and couldn't figure out why it wasn't working. Also ebay crankshaft sensors sounds like a bad idea lol

[@SimpleCarGuy]

Luckily I had other projects to distract me from this issue, but I'm so happy it's fixed now. The reason I got a crankshaft sensor from eBay was strictly for testing purposes since it was like $20. Luckily I haven't had any new OE parts come back defective, that can be a pain! Thanks for watching!

[@Melodic_SK]

Very clear and detailed…Thanks for this 👍🏼

[@n3307v]

Thanks so much for making this video. I was sure it was a vapor lock issue. The E89 is one of the most beautiful cars ever made (in my opinion). Sometimes I just stand and look at mine after I've driven it. It's such a great piece of rolling art.

[@SimpleCarGuy]

I do that every time! I park, walk away, glance back, smile and keep going! I'm so happy I got it fixed after trying all those things. Thanks for watching!

[@nazihsouliman4689]

What part did you replace to solve the problem

[@rajm.5819]

This guys replaces all engine parts and sensors after replacing engine. Lmao

[@VassiliySmith]

Thanks for video. Have almost same issue. Sometimes (8 times per 10) when engine is warm have long crank and really difficult start of engine. When it's cold - starts good. E92 N52B30

[@jamesortega8681]

if you suspect pressure delivery, before you buy parts check fuel pressure after the first start. if it doesnt drop anywhere in the fuel lines then its not fuel delivery. if its a heat issue anywhere, cold start then immediately turn off. so everything should still be cold, start again, it shud start no prob if its a heat issue

[@peterfinch5228]

Great video

[@bigbooste9264]

Wow 😂 glad you got it! Can’t believe it was that simple

[@SimpleCarGuy]

Neither could I! After trying all of those items I was shocked it was the part that.. well, starts the engine :)

[@zmanpianoman]

Cam sensor, oil temp sensor, fuel pump pressure regulator.

[@charlestonsasha]

Had a bad relay on 2004 porsche cayenne. Same issue.

[@thomasbell6655]

Invaluable info. Thanks Sir.......Merry Christmas

[@SimpleCarGuy]

Merry Christmas to you as well! Thanks for watcing.

[@zmanpianoman]

But we have the same not starting problem and WE DID NOT change engines. Now what???

[@maumau34]

i have the exact same problem, but this problem just appeard after the turbo change because the first one broke. But when is in idling it stutters Can it still be because of the starter??

[@MBB_bh]

I changed my starter still facing the same problem, with my porches cayenne

[@sl5607]

Did your old one also make a zoom sound every 30 seconds? when it was off?

[@endlessgarage]

I have the same issue where idle will be really low or the car will struggle to start a little but only on cold starts. And not all of them. When its warm it starts right up. I've done fuel pumps and a lot of other stuff. Never got it to go away completely :/

[@arvydaskirsnauskas8337]

I have same problem on my 1 series 1.6. warm not startind and I checked everything. I dont have satrt spot funkcion. Im geting code that my camshaft posision sensor is bad. I replaced them, but still same problem. Dont know what to look anymore. Fuel pump is fine also.

[@DigitalDissident]

You can enable start stop memory, to disable it...

[@SimpleCarGuy]

Funny enough, I coded it to stay disabled and it would come back enabled after a few days. No clue how or why. Of course, the issue was the same when I would walk out of the grocery store or something and the car wouldn't start right..

[@marba2366]

Got a bmw f30 i have the exact same problem

[@nazihsouliman4689]

Hello, I have the same problem, bmw, e60, and I don't know the reason, do you think because of the vapor lock, and how should I solve this problem

[@brandi6087]

Did you fix it? Mines doing the same thing. Stuck at work again tonight. The mornings it starts and runs fine.

[@JGV_IX]

Start/Stop systems serve no other purpose than to irritate the crap out of every car guy I know 🙄🤬