running rich at idle

[blueseven]

Hi all.

I was down at my mate's garage having my tracking sorted (what a difference that makes to the steering feel and turn-in). While I was there I got him to do an emissions test as he said it smelled a bit rich. At 2,500rpm it was fine and within allowed tolerances but at idle it was running really rich. Values at idle were...

CO = 2.24% vol
HC = 1913 ppm
CO2 = 13.43% vol
O2 = 0.77% vol
Lambda = 0.905

Is there anything I can check/adjust myself or or should I leave it to the experts?

My cars a 95 400HC

Cheers

Gav.

[blitzracing]

A failing AFM, wrong fuel pressure, under reading temp sender, excessively low base idle (odd this one??), a misfire,or a failed lambda sensor. Start with plugging in a fault code reader.