M20 AFM setting, chip install

[ETERNITY]

I recently chipped my ecu by using a chip from Atech

After installation everything was fine, but last 2 days, its been kangooring, and rough on idle. Shaking side to side, and hunting. However it clears after 1000 rpm.

Ant told me to adjust my afm setting, and told me to adjust it by 1 whole turn.

Which way do i turn the setting nut and also do I need to reset the tps settings.

[DaveD]

sounds more like an air leak

[ETERNITY]

naa its running rich dave

No leaks, I have cheked

[DaveD]

mine failed its test on the same symptoms .,, running rich ,... lumpy tick over ..ok when run over 1200revs ...new throttle body gasket needed

[ETERNITY]

Ant did tell me to reset the afm, but he never mentioned which way to turn the afm setting

[PG325]

Counter clockwise will lean the mixture if you're running rich, I wouldn't suggest for one moment that you do this without having a gastester up it's ars*, and by this I don't mean a british gas employee!!!

Seriously though I would only adjust with a tester measuring the exhaust gases.

I did mine last weekend, I set it to 1% CO, adjusting just a quarter of the turn reduced it to nearer 0.6%.

[ETERNITY]

Ok i will wait till it goes in for Mot and have wait for the emissions report

[jann]

Hmmm this happened to me when I had my chip in the iS..although I haven't touched the afm, since it runs and idles fine without the chip in.

[ETERNITY]

Ant knows his stuff and he has told me to adjust the afm screw by 1 turn, but I forgot to ask him which way to turn and which screw to turn.

any ideas

[Gristo]

the adjustment srew should be under this cap(no. 2 on pict)



the more opened this skrew is, the more lighter your mixture is(more air, less fuel).
I dont know your chip settings so I'm not sure, will it need more air or fuel..

fix the screw present position start the engine and start turning this screw slowly on clockwise and opposite..you should hear the engine running more smoothly once..
hope it helps

[ETERNITY]

the adjustment srew should be under this cap(no. 2 on pict)



the more opened this skrew is, the more lighter your mixture is(more air, less fuel).
I dont know your chip settings so I'm not sure, will it need more air or fuel..

fix the screw present position start the engine and start turning this screw slowly on clockwise and opposite..you should hear the engine running more smoothly once..
hope it helps

thanks for that

I have adjusted the screw and also the clog anticlockwise on the internals and its sorted the problem out(I think!)

will report back

[Gristo]

I'm happy for you,mate

[ETERNITY]

I am too, but seems as though accelaration doesnt seem as responsive



i will have to let the MOT guys sort this out and set the afm accordingly