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Car Running Very Rich
Posted 27 June 2017 - 10:22 PM
She started first time which was pretty good as she had been stood for 3 years.
But when i revved it up she was spluttering and quite boggy in low revs.
So i took the plugs out to check them and they were blacker than black!
What are the common faults for overfuelling on these gti's how do the afm adjustment work? Wind in to richen and out to lean?
Any helo would be much appreciated
Posted 28 June 2017 - 12:09 PM
What exactly have you do to get it running again?
I'd look into the basics before assuming the AFM needs adjusting, this is best done with an exhaust gas tester anyway.
It's possible the SAD & coolant temp sensor plugs have been cross connected which can cause of over-fuelling but are the HT leads fitted in the correct order, dizzy timing correct?
Posted 28 June 2017 - 05:38 PM
It had no oil filler housing connected and all the breathers had were missing apart from the the sad ones.. Its not missfiring its just badly overfuelling .. How do u check ignition timing ? If i get a strobe where is the marks? Crank pulley or flywheel? How will i know if the sad an coolant sensor plugs have been put on the wrong way? Is the coolant one blue?
Also the car is sorn so i cnt get it to a mot station for gas analyser
Posted 28 June 2017 - 06:16 PM
Is the coolant one blue?
Yes and the plug going onto it should be blue too.
Posted 29 June 2017 - 01:26 PM
Posted 29 June 2017 - 01:32 PM
or damaged wiring or poorly setup.
Posted 29 June 2017 - 01:58 PM
1.6 GTi ECU part number should end 340, the AFM 056 and the injectors should be blue in colour. Be suspicious if someone's had the plastic lid off the AFM too (tale tale of sealant splodged everywhere)
Posted 29 June 2017 - 06:34 PM
I read a post about setting them up the other day i think it was welshpugs post about startin from scratch. Winding afm out.. screwing idle right in an then adjusting it up.
What should the resistance be when the sensor is cold?!
Posted 29 June 2017 - 06:47 PM
Posted 29 June 2017 - 07:43 PM
0280 130 056
bosch part, as used on BMW's of similar era and probably many more, GSF used to stock them, never actually found one that has failed though.
Posted 29 June 2017 - 08:18 PM
Posted 29 June 2017 - 09:37 PM
Posted 30 June 2017 - 08:40 PM
For the actual AFM mixture calibration you'll need some measuring tools either CO2 gas analyzer or wideband or at least narrow band lambda sensor with a gauge .. i prefer wideband for AFM mixture adjustment , can be done very precious with the wideband .
Without any gas/mixture measuring device you'l be pretty much lost in how much is needed on either rich or lean , really can't be done precisely "by feel" .
But roughly , can try to lean it out a bit via AFM spring tension , mark current position of the cog wheel and turn it clockwise say 2 or 3 tooths , lock the cog wheel and try starting if It's any better/less rich .. if not , if you can still smell rich exhaust , turn the cog wheel some more on the clockwise but.not more than 2-3 tooths in one go .
Edited by DamirGTI, 30 June 2017 - 08:45 PM.
Posted 30 June 2017 - 08:52 PM
Believe me, I've had to fix ones that people have messed with trying to solve issues like yours that were inevitably unrelated to the AFM.
Is there no one local to you with a 1.6 GTi who would be willing to test your AFM by plugging it onto their car?
I need to pop up to Redditch soon and have a few 1.6 AFM that you could try to rule it out.
Posted 30 June 2017 - 08:59 PM
Posted 30 June 2017 - 09:09 PM
Posted 30 June 2017 - 09:21 PM
It will help you as it means folk can read all the symptoms etc in one place rather than it being scattered about.
Posted 30 June 2017 - 09:29 PM
Posted 30 June 2017 - 09:33 PM
I'd do an throughout check on the engine electronic and mechanics , if there's nothing found what would explain rich running engine would then try to play with the AFM .. seen a lot of "boy racer" back in the days which unwind the AFM spring tension chasing for more power !