ford 5.0 spark plug recomendation

partsbob67 · 06-03-2009, 09:31 PM

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.

Sean Marconette · 06-04-2009, 08:21 AM

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

partsbob67 · 06-04-2009, 09:15 AM

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.

buzzinhalfdozen · 06-04-2009, 09:57 AM

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

partsbob67 · 06-04-2009, 06:27 PM

thanks i'll check the sensor.

7423 · 06-04-2009, 07:05 PM

Bob
Check your PM

06-03-2009, 09:31 PM	#1
partsbob67 Member Join Date: Apr 2005 Location: rohnert park,ca Posts: 411 Likes: 9 Liked 37 Times in 10 Posts	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. __________________ bob beals 7244

06-04-2009, 08:21 AM	#2
Sean Marconette Senior Member Join Date: Mar 2006 Posts: 960 Likes: 632 Liked 167 Times in 61 Posts	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 __________________ Sean Marconette 84 Mustang 5060 SS/N

06-04-2009, 09:15 AM	#3
partsbob67 Member Join Date: Apr 2005 Location: rohnert park,ca Posts: 411 Likes: 9 Liked 37 Times in 10 Posts	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. __________________ bob beals 7244

06-04-2009, 09:57 AM	#4
buzzinhalfdozen Senior Member Join Date: Sep 2006 Location: Bellevue Ohio Posts: 985 Likes: 0 Liked 12 Times in 9 Posts	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 __________________ Joe Buchanan SS/BX 3117

06-04-2009, 06:27 PM	#5
partsbob67 Member Join Date: Apr 2005 Location: rohnert park,ca Posts: 411 Likes: 9 Liked 37 Times in 10 Posts	Re: ford 5.0 spark plug recomendation thanks i'll check the sensor. __________________ bob beals 7244

06-04-2009, 07:05 PM	#6
7423 Senior Member Join Date: Dec 2006 Posts: 640 Likes: 0 Liked 1 Time in 1 Post	Re: ford 5.0 spark plug recomendation Bob Check your PM