BMW z3 2.0 misfire

[Alfa105]

Hi I am new to the site , bought a z3 2.0 in January beautiful machine but the last 2 months eml and traction light on it starts on the button but as soon I feather throttle it misfires , changed plugs ,maf , cams and crank sensor, rubber hose on intake fuel filter , cleaned air intake and still no joy , can anybody advise?

 

[colb]

You make no mention of scanning it for codes, thats the first thing to do to see what has brought the warning lights on.
It should show you which cylinder is misfiring.
I see you put new plugs in, what about the coil packs, have you moved them from one cylinder to another to see if the misfire moves, that would show if one of the coil packs is responsible, having said that you will need a scanner to see if the misfire has moved with the cylinder change.

 

[Alfa105]

I had it scanned a few times from garages the first was throttle body switched off and they advised to replace and I did , then idle air control p0505 , afterwards p0340 cams sensor then crank I am going mental

 

[Alfa105]

Scanner mention misfire on cylinder n 5 I switched with the number one and no fault found

 

[colb]

You really need to get yourself a code reader and avoid having to take it to Garages to do it, the outlay on a decent code reader will keep the money you spend at Garages in your pocket. Get yourself a Creator 310+ or Creator 410 Scanner off ebay or Amazon, circa £50. Seems your capable of spanner work and the code reader will direct you to the actual problem(s) you have so you can fix it.
I would be looking at a duff coil pack being the cause of your misfire, code reader will pinpoint which one is the cause. Just seen you moved 5 to 1 with no change. If you relied on what the Garage told you was the source of the misfire I would certainly check that out with my own scanner and then do the coil pack move depending on which one comes up on the code reader.

 

[Alfa105]

I have this one , not sure how good it is

 

[Alfa105]

Scanned again and showing p0101 and p0505

 

[Shelly]

 

[Alfa105]

Hi are you ok?

 

[colb]

Basic Creator Scanner by the look, the later 310+ will probably do more than the one you have and have the ability to look at live engine data. Given that its pointing to the Camshaft Sensor replace that and clear the code with your scanner.

 

[Alfa105]

I have now I have p0101 and p0505

 

[colb]

P0101 relates to a bad Maf sensor
P0505 relates to a bad idle
Check for air leaks across the intake and entire engine vaccum syatem for split hoses
Clean the idle control valve with carb cleaner.
If you disconnect the electrical connector at the Maf the car will revert to default settings if it improves with it disconnected then suspect a bad Maf. Only replace the Maf with oem parts from Bosch or Seimens.

 

[Alfa105]

I have put a new one on but unplugging it engine dies I have put back the old one , I have cleaned the idle control as well with carb clean and the internal moves freely but I cannot check if it works

 

[t-tony]

What make and price was the new one?

Tony.

 

[Alfa105]

It was an aftermarket one I think £ 20 , 30 , I was told if you unplug when running engine it shouldn’t make engine die and it did so I have put back the Siemens back on and the code still there, I have a diagnostic specialist coming in tomorrow as I had enough !! Strange that I fitted an original bmw crank sensor and it started on the key and revved with no misfire at all and no light on dash but as soon I got out of the driveway it started again with same issue

 

[t-tony]

Does it still run when you unplug the original MAF?

Tony.

 

[Alfa105]

Yes

 

[t-tony]

You need to buy a genuine, or OEM standard one, or even borrow one from a known good running car to verify. Try and get your money back.

Tony.

 

[Alfa105]

A bit to late to get the money back now , but the car was cheap to buy in the first place and was running really well until 2 month ago after 100 mile round trip , but I need to get it running again for the summer time, thanks for advice from now onwards only original parts