Messed With Something I Shouldn't Have.

[Jayzzle]

So basically, I messed with my AFM ( I think that's what it's called, pics below) for the emissions test for the MoT, it passed, but the guy said if I keep running it like that I could damage my engine. So I went to change it back, but like a !Removed! idiot I forgot which way I turned it originally and how many clicks I turned it, so I just turned it 3 clicks counter clockwise and left it at that. Also, I messed with a screw too but it didn't seem to do anything.

Now, when the engine warms up, I get white smoke from the exhaust, getting worse as the engine gets warmer, is that because I messed with what I shouldn't have?

Thanks Chaps.

[Guest Mister Dabsy]

The "screw" is prob for the pressure signal to the ECU - By turning clockwise would tighten the copper spring and prob increase the signal sent.

The "cog" thingymajig is a potentiometer and acting like a throttle - Notice the curved strip at the top of pic, you must've turned it clockwise for it to be in that position.

As for the white smoke - if the head gasket is fine then this will be excessive "hydrocarbons" which should've shown "High" at the MOT !!

Just ideas doooood ;)

[Jayzzle]

Yeah it was high for the first fail, then I moved that black cog thing ready for the retest, and the emissions went right down to the other end and were just inside the parameters for an emissions pass so the bloke said. but I moved it back up again, or in one direction, I forgot what way I moved it originally, so I just moved it counter clockwise a few clicks. I'm gonna assume the head gasket is fine, I've checked for the milky gunky stuff, I'm not losing coolant, and I'm not losing oil, and it doesn't overheat. Or at least I don't think it overheats, it was idling for about 45 minutes the other day when matey was doing the mot, and it was halfway hot when I got there, so I'm guessing it isn't overheating.

That pic isn't actually my car but funnily enough that's roughly where that arm thing is on mine too.... And I think I did turn that screw clockwise yeah, I remember watching the copper thing spinning lol.

Any idea of a fix for this? Or do I just waste more money taking it to a garage to have them fix it? Or buy one off ebay? Or leave it? Haha :D

On a plus note, after fixing all that stuff that was on the fail sheet (props again to Gav for showing me what to do) and spending some more moolah on getting it welded, it finally passed the MoT ;)

I just looked at the emissions report for the pass, when I moved it the first time, max is 3.5% co and I was at 0.44% No idea what it is at now though.

Thanks.

Edited September 12, 2013 by Jayzzle

[Guest Mister Dabsy]

Glad to hear the Gasket is fine ;)

Maybe get a "Colour-Tune" kit that uses an adaptor for the spark-plug then piss around with those cogs 'n screws til it shows up good ! Or spend some coin on a Mobile Tune-up !

[Jayzzle]

Any idea of a rough price range? For both your suggestions :)

[Guest Mister Dabsy]

£20-£30 for the ColourTune and maybe £50+ for a mobile to come n do it ;)

[Jayzzle]

Clicked it back a couple, meh, idc anymore tbh lol. Runs ok, no more white smoke, just hesitates for a second if you stomp on the happy pedal. Guess that's old age? Meh. Idc. Thanks for your help good buddy.

[Guest Mister Dabsy]

My pleasure... Always ;)