Hot start issues ,please help

[Jimmy Weston]

I've had a problem over the last few months,getting worse as time goes on,when the cars warm ,I turn it off and some times it starts,and then it goes to start and cuts out,and I after plant me foot on the throttle pedal to get it to go,when it's running there's no issues at all,I plugged the bm multi scanner tool in ,and the code 7500255 popped up,which is the engine control module I believe,I've tried looking for it to no success to clean the pin and blocks to see iff that cures it,or is something triggering the Ecm ,eg crankshaft sensor or something?any advice much apriacted .
Thanks Jimmy.

 

[t-tony]

I had very similar issues on my 2.0 Z3 Jimmy and it was the inlet camshaft position sensor mate. Have you checked all the usual suspects, ie. induction hoses and connections etc.

Tony.

 

[Jimmy Weston]

Thanks Tony for that,so something can trigger the ecm, I will try to locoate the inlet cam sensor ,and replace it with a genuine oem one from Bmw,as I've heard some aftermarket sensors aren't to great.ive double checked all hoses and clips and they seem fine,the cam sensor is first on my list now.
Thanks
Jimmy.

 

[Brian4]

Hot start definitely sounds like cam sensor. You might also have noticed a loss of performance as well. Just changed ours and all good again

 

[Jimmy Weston]

Thanks Brian,is it the one you showed me you'd replaced at rockingham mate,left off the oil filter ,towards the vanos,where the cable goes over and under the inlet manifold Brian?
Thanks
Jimmy.

 

[t-tony]

That's where is was on my 2.0 Jimmy, removing the oil filter makes it very easy. I did a write up on how to do this . I'll see if I can locate it for you.

Tony.

 

[Brian4]

Thanks Brian,is it the one you showed me you'd replaced at rockingham mate,left off the oil filter ,towards the vanos,where the cable goes over and under the inlet manifold Brian?
Thanks
Jimmy.

Hi Jimmy yes that's the one. Mine was a Febi Bilstein who are an OEM manufacturer,

here's a link done by Aceman
https://zroadster.org/articles/bmw-z3-m52tu-cam-sensor-replacement.68/

 

[Jimmy Weston]

Thanks boys much apriacted,il replace the exhaust sensor as well ,just to make doubley sure,Sytners here we come,ouch

 

[t-tony]

Thanks boys much apriacted,il replace the exhaust sensor as well ,just to make doubley sure,Sytners here we come,ouch

Hey Jimmy, I finally found it !! This is my 2.0 Z3,

https://zroadster.org/threads/inlet-camshaft-sensor-replacement.8931/

Tony.

ps. There's also this by Ian (Aceman) which covers the exhaust cam sensor as well.

https://zroadster.org/articles/bmw-z3-m52tu-cam-sensor-replacement.68/

 

[Jimmy Weston]

Well thanks @t-tony and @Brian4 I've fitted the new crankshaft sensor and 0ring £117 from Sytners ,and reset the DME ,and the problems all gone away ,thankyou,I bloody love this forum,I also took the opportunity to wipe a damp rag over the engine ready for zedfest ,only a two weeks away now, the forecasters keep saying we're gona have Indian summer,please let's have it for that day.
Thanks
Jimmy.

 

[Bozzy]

Good to see you got it sorted Jimmy .
I agree re the forum,you can't help but love it when there's all the help and advice you could wish for .

 

[Brian4]

@Jimmy Weston its amazing the difference that they make probably just from being in quite a hostile environment but do last well really for a bit of electronics.

 

[Jimmy Weston]

Well I changed the oil and filter , and plugs today ,and went for drive ,I had brew ,1/2 hour an later the ruddy thing wouldn't get goin,it fired up then cut out straightaway again like it used to, I got the computer out cleared the fault code,part no 7500255 ,still no joy after 15 minutes, so I checked. Everywhere ,blew into the Maf sensor ,hey presto she fired up ,so I got a new Maf ,and also the camshaft exhaust sensor this afternoon and fitted them ,tommorow il find out iff it's finally cured, or I may have after have a new Ecm ,or send mine away to someone to be reconditioned ???parts spent so far this week trying to cure this problem so far
Bmw inlet cam sensor and o ring £116.92
Bmw oil filter and sump plug £14.91
Forte oil flush£12.00
Castrol magnatec c3 £53.72
Bosch super 4 plugs x6 £27.54
Siemens air mass sensor £186.84
Oem exhaust camshaft sensor £48.84
Total so far £460.77
Fingers crossed for tommorow it should be ok on a good run out.

 

[Bozzy]

Crikey mate, let's hope the new maf sensor was the culprit this time. Fingers crossed for the trial run tomorrow .

 

[t-tony]

Hope you've finally nailed it Jimmy.

Tony.

 

[Jimmy Weston]

Hopefully those two new parts I fitted today should bloody cure it, i didn't get chance to test it late this afternoon, as it was early doors for a beer and curry nite,mmm the beer made it feel an old load better, as someone once said to me,beer doesn't contain many vitamins, that's why you need to drink lots off it

 

[t-tony]

Hopefully those two new parts I fitted today should bloody cure it, i didn't get chance to test it late this afternoon, as it was early doors for a beer and curry nite,mmm the beer made it feel an old load better, as someone once said to me,beer doesn't contain many vitamins, that's why you need to drink lots off it

Someone crossed my palm with some Foster's today mate. Just sampling my first "Cold One".

Tony.

 

[Bozzy]

Well if it doesn't work and you end up scrapping the car, can I have the wheels please ?

 

[Jimmy Weston]

You can't beat having a beer,it helps u unwind,I had 4 pints off peroni with me chicken madras,I'm bit bloated now,so know I'm sipping a baileys or two,and enjoying reading the forum as always mate.

 

[Jimmy Weston]

you have the wheels for free bozzy iff it doesn't work, but the tyres ul be an extra £800 plus delivery mate.