ford 5.0 spark plug recomendation
 

what plugs do you guys recomend for a stockker application? i've been running motorcraft number asf 42c, with phillips tt100 fuel. should i change? plugs always look black and sooty, but my wideband shows i'm lean or better. thanks in advance.

Re: ford 5.0 spark plug recomendation
 

Just a dumb question? Where is your O2 sensor mounted? An exhaust leak will give bad readings. If you have the O2 sensor mounted next to the collector, you could be getting a diluted reading also.

Sean

Re: ford 5.0 spark plug recomendation
 

down by the collector, but i run an x-pipe and mufflers.exhaust dumps right before the axle, so i don't think it is getting diluted.

Re: ford 5.0 spark plug recomendation
 

By lean on the wide band you mean?.......What's the AFR? And does it show lean at idle? Have you looked at the sensor to see if it is sooty, I've seen 02sensors get sckewed and give false readings, just some thoughts. Joe

Re: ford 5.0 spark plug recomendation
 

thanks i'll check the sensor.

Re: ford 5.0 spark plug recomendation
 

Bob
Check your PM