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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,527
I have found a couple of good uses for the less expensive A/F gauge.

Mine is mounted in a spot where I can see the LED red/yellow/green without taking my eyes off the road.

When the car starts cold I watch as the LEDs hit 2 greens. As it warms the LED goes 1 green and then down to 3 yellows and stays there.
When I jump on boost I can see the LED jump to 2 greens and stay until I back off. All without taking my eyes off the tach and road.

One time I noticed that the unit was showing 1 less green light when cold and 1 less yellow when warm. I monitored the situation for several weeks and watched it progressively get worse. My thoughts were that the O2 sensor was going out. After about a month the car began to be hard to start. Long story short - I was developing a vacuum leak - and the el-cheapo A/F meter had caught it before I did!
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 02-28-2007, 08:46 AM
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