got a problem with my gasses! HELP!

[buffalino]

got a problem with my gasses!
In my mot today my gasses from my exhaust were to high, im thinking it could be the ecu,, would it be down to anything else? can someone enlighten me please ,,

[pacerpete]

M3 convertible ? Air leak/ oxygen sensor / injectors/ AFM / piece of string , it could be anything.
What does it run like ? Post up the readings, that will give us a better clue .

[buffalino]

Runs perfect, better with the ecu disconnected, connected drinks petrol, Co relenti 0,65% CO Accel;0,79% LAMBDA 1,089,,
sorry its in spanish but i think you can work it out.
and disconnected
Co relenti 0,18% Co accel 0,61 and lambda 1,029

[Speedtouch]

How would it run at all with the ECU disconnected?

As a first step, I would remove the spark plugs and check the colour of the tips, which should be a light tan colour.

[buffalino]

maybe its not the ecu but the mechanic unplugged something next to the water reserve bottle(top left) ill get a photo tomorrow,i think it was going to the lambda, i imagined it was the ecu plug,, sorry for bad info ,,its all new to me ,,changed spark plugs and petrol filter,

[Speedtouch]

Ah, but did you fit the correct grade plugs, and gap them correctly (if required)?

Might be worth doing a compression test, to ensure all cylinders are roughly equal pressures.

[Francisco]

Most likely that is NOT an ECU problem.

[buffalino]

[imghttp://i5.photobucket.com/albums/y164/buffalino/8a1a937f-2dfa-4be7-b487-76107b8b502a.jpg?t=1402557918
[/img]

pacerpete , the disconnected 3 pin plug !
and Francisco, what do you think the problem is?

[buffalino]

Speedtouch,, done a compression test all good there, and the plugs came from bmw 80e and only a month old, did not check gap,,

[pacerpete]

[imghttp://i5.photobucket.com/albums/y164/buffalino/8a1a937f-2dfa-4be7-b487-76107b8b502a.jpg?t=1402557918
[/img]

pacerpete , the disconnected 3 pin plug !
and Francisco, what do you think the problem is?

That is the plug to your oxygen sensor . Was that connected when your car was tested ? It should be . The car will run with it disconnected but probably not pass a low value emission test.

[Francisco]

Could be several things,

But since you've covered the basics already (plugs, compression, air filter, etc.) the usual culprits on these cars are the MAF and the DME temp sensor (the blue sensor on the water rail above the exhaust manifold) but I'd replace the lambda sensor as well.

The DME temp sensor failure is usually more dramatic but worth testing (I usually replace them on all cars anyway).

Hope it helps

[buffalino]

francisco;the lambda is new as well and thedme is tryed and tested
pacerpete: ok i done two mots one with it connected (the first readings)
and the second reading disconnected!

Co relenti 0,65% CO Accel;0,79% LAMBDA 1,089,,

and disconnected
Co relenti 0,18% Co accel 0,61 and lambda 1,029

[buffalino]

francisco;the lambda is new as well and thedme is tryed and tested
pacerpete: ok i done two mots one with it connected (the first readings)
and the second reading disconnected!

Co relenti 0,65% CO Accel;0,79% LAMBDA 1,089,,

and disconnected
Co relenti 0,18% Co accel 0,61 and lambda 1,029

[Francisco]

francisco;the lambda is new as well and thedme is tryed and tested
pacerpete: ok i done two mots one with it connected (the first readings)
and the second reading disconnected!

Co relenti 0,65% CO Accel;0,79% LAMBDA 1,089,,

and disconnected
Co relenti 0,18% Co accel 0,61 and lambda 1,029

Then, as I said, my bet goes to the AFM (Air Flow Meter)

[buffalino]

, my bet goes to the AFM (Air Flow Meter) i dont see this in your posts above ! what is it and where? is it the MAF or the DME?

[Grrrmachine]

MAF and AFM are two different technologies that do the same job - measure air into your engine. YOur M3 will have an AFM, not a MAF.

Likewise, DME and the ECU are two words for the same thing - the DME relay is just a relay that turns on bits of the ECU.

[buffalino]

thanks for explaining that machine man!

[buffalino]

thanks for explaining that machine man!

[buffalino]

anybody else got any ideas? HELP!

[Speedtouch]

Which grade fuel are you running it on?

[buffalino]

95 AND 98 without plomo DEPENDS ON THE DAY,!

[buffalino]

it passed on the last mot and iv only done 5000km since then and the 3years b4 them only 10000km