fobra570

running rich cant hurt the motor lean can so don't b going and changing ur WOT

1999mustang2000

ok thnx for all the help guys and girls ima go check everything and if i cant find nething ima go take it to my mechanic

oxfordgt

Running to rich can hurt the engine by washing the cylinder walls and leading to premature piston, ring and cylinder wear that will make you lose compression and kill your power.

98redstang

im having the same exact problem with my car! i just installed lt headers and a high flow catted midpipe and i had a catback already and my car was running like ok it could have used a tune cause it was running a little rich. But i drove to my gf college and on the way back it was running like ****. When i would stop it was idling fine but it was shaking like crazy. So idk what the hell to do. I think ill clean the egr first and check for vacums leaks. Oh and its running rich too you can smell it. Anyone else have any sugestions?

1999mustang2000

ok so i took my car to a shop today and he said he cant find nething wrong? so wat now guys?

2000GT4.6

First of all, sounds like to me this "air fuel gauge" is not a wideband, but narrowband. If this is the case, it is completely useless anyway.

second, what numbers is the gauge showing? The car should run pretty rich being an FI car. Being rich at idle isn't necessarily a bad thing either, unless its so rich its causing the stumble problem.

Sounds like to me you need to hit a dyno with a wideband a/f ratio meter. Playing with the handheld and your in car a/f meter is a sure fire way to blow up an engine.

1999mustang2000

ok the gauge says lean stoich rich in that order lights for the lean are red lights for the stoich are orange and the lights for rich are green