Black Smoke and Lumpy then Gone !

[Jamo]

3B ecu does use the mfts, faulty mfts/plug can make the ecu limit boost.

Ian

You can get a new plug/pins/wire from the dealer for not too much money.

Not for the coolant temperature reading it doesnt to which I was referring

The coolant temp value you see in vagcom comes from the sensor in the head but he has changed this already

[ian4455]

To sum this up - over Fuelling is the result of a problem on my car. Engine is always ok from cold but as it warms up at some point it starts to splutter. Let it idle after it does this the boost gauge instead of reading -6 its at -2 with the extra fuel going in. I leave the car running at idle like this for a minute and it suddenly stops doing this.

[salad.dodger]

I know my 100 turbo MC2 engine is different but it does this on start up, lumpy with black smoke until rev'd to 3000 rpm

I was told lamda probe could be at fault????

[ian4455]

Just done the blink code test, 2341 02 sensor exceeded... expect that if it was overfuelling.

[Jamo]

Have you tried clearing the Adaption tables in the ecu?

[UrS4boy]

Just done the blink code test, 2341 02 sensor exceeded... expect that if it was overfuelling.

That is the code that people get when they have a leak in the hoses between the MAF outlet and the throttle body. Have you checked for boost leaks and in particular the condition of the MAF to turbo hose. Those have been failing due to age, etc. more often recently. That would be the 3B equivalent of this AAN black rubber hose in the bottom right of this diagram:

[ian4455]

I'll check the hose tomorrow, how do you clear the adaption tables in the ECU ?

[newsh]

I'll check the hose tomorrow, how do you clear the adaption tables in the ECU ?

Pulll the "motor" fuses in the fuse box for a few minutes.

The low vacuum reading certainly points to a boost leak.

[UrS4boy]

Pulll the "motor" fuses in the fuse box for a few minutes.

Previously I suggested that according to Paul N's diagrams (pg.43/57), on the row with the No. 23 through 32 fuse holders, the No. 23, 26 and 30 holder positions are empty, with No. 24 = the ISV, WGFV and Evap Control fuse, No. 25 the O2 sensor fuse, No. 27 = ECU constant 12v, No. 28 = fuel injectors and MAF and No. 32 = coils (reference: Paul's wiring pdf, Pg. 40/57)

As a result, I think you mean Fuse 27 (under the Orange "Motor/Moteur" cover):

[newsh]

Easiest to just pull the 2 out as a pair complete with the orange cover

[UrS4boy]

Easiest to just pull the 2 out as a pair complete with the orange cover

Agree. I just was pointing to fuse 27 in case Ian's fuse box was missing the orange "Motor/Moteur" cover.

[Jonas_R]

Have you tried changing the lambda probe?

[ian4455]

Prior to upgraded my 3b the car was running fine, after fitting the RS2 turbo and running the car for the first time it leaked a considerable amount of oil from the hot side into the exhaust. Turbo's sorted now but wondering if all that oil has broken the Lambda sensor ??

[220bhp]

What chips are you running this car on,or who mapped it.

[ian4455]

Using a fault code reader i get a 0537 fault code after it starts running lumpy.