MAF cleaning

[Ian Simmonds]

Right, finally got my Isopropyl alcohol and set too with removing the K&N filter and MAF





No problems there, the airbox wasn't too dirty and the 'performance' air filter, being only 6 months old, wasn't dirty, but it definitely has an oil based residue on it that is greasy to the touch.

Now the MAF - All came apart okay and was really surprised at the oily dirt on the gauze and within the MAF tubing. The MAF wire was also dirty -

this is the 'engine side'



and this is the 'airbox side'



It's surprising the discolouration.

Anyway, all gone back together tonight, just waiting for the new paper air filter to arrive first thing and I'll give it a test. I plan to leave the engine side gauze off (mainly because the current gauze is torn anyway).

[DaveJ]

Air Mass Circuit Diagram ?

Who has got a circuit diagram for the ABY engined coupe ? Please !
I have been collect some waveforms from various parts of the engine with a PC based oscilloscope including O2 sensor, injector and primary ignition pulses. I have noticed on pin 3 (signal) of the the Air mass sensor it sits at about 2.5V, which is high compared to other vehicles I have looked at. Does anyone know if any of the pins are meant to go directly to ground. I scoped them all and there is no solid ground -about .5V at one end (front) May or maynot be a problem. Who can tell me ? Car is running qiute well otherwise.

Thanks guys - circuit would be so helpful.

Dave