MustangWorks.com : Ford Forums - View Single Post - Whats the best way to tell if your running lean or rich?

Rick 91GT · 09-10-2001, 10:07 AM

The best way would be a wide ban O2 unit either installed on your car (expensive, but the ultimate tuning device) or you can have it done at a dyno.

Reading the plugs is the easiest way, go out and run at WOT then try not to let the car idle long and pull the plugs. WHITE is LEAN, BLACK IS RICH. If it is really rich it may also blow black smoke.

The EGT gauge is also good but I have no idea what temp a NA car and a blower car should run? Anyone know this?

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Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension, SPEC stage III clutch, Lakewood SFI bell, S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon!
<B>12.16 @ 113.5, 1.78 60ft..no traction in the 90 degree

[This message has been edited by Rick 91GT (edited 09-10-2001).]

[This message has been edited by Rick 91GT (edited 09-10-2001).]

09-10-2001, 10:07 AM	#3
Rick 91GT Procharged! Join Date: May 1999 Location: Hanover, PA Posts: 1,539	The best way would be a wide ban O2 unit either installed on your car (expensive, but the ultimate tuning device) or you can have it done at a dyno. Reading the plugs is the easiest way, go out and run at WOT then try not to let the car idle long and pull the plugs. WHITE is LEAN, BLACK IS RICH. If it is really rich it may also blow black smoke. The EGT gauge is also good but I have no idea what temp a NA car and a blower car should run? Anyone know this? ------------------ Check Out My Site 91GT,Holley SysteMAX II Kit-Heads 2.02" x 1.60" port matched to a 1262,Anderson N-61,24#,76mm C&L,Full MAC, No A/C or PS or emissions, 12" K&N Filter,RNH PERFORMANCE Ram Air,Ron Davis Radiator,Full Suspension, SPEC stage III clutch, Lakewood SFI bell, S&W 8pt "X" brace,JAZ seats,3:73's,Welds..etc,4:30's and 31 splines coming very soon! <B>12.16 @ 113.5, 1.78 60ft..no traction in the 90 degree [This message has been edited by Rick 91GT (edited 09-10-2001).] [This message has been edited by Rick 91GT (edited 09-10-2001).]