running rich, but spark plugs show lean? - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kings_blend · 05-28-2006, 12:13 PM

Hey guys a buddy of mine has a sr20det with a full rebuild, cp pistons, eagle rods, 270 cams, greddy intake mani , peakboost exhaust mani, 1000cc injectors, gt3071r, and an AEM EMS. We got it running a few days ago on a map he had tuned for a slightly different setup, but we retarded timing a couple degrees and richened the fuel up about 10%. The ems is setup for the injectors he is using. At idle the wideband shows 11-12 afr, rich I know, at WOT it shows 11, cruising about 12-13 and and at idle you can smell the gas coming out of the exhaust pipe (no cat). But after a run on the freeway we pull the plugs and by the looks of them it seems like the car is running lean. The first is white and they get darker as the move to the fourth. I was really confused when we investigated. Could it be the wideband isnt working properly and showing its running rich? I believe the plugs more than the wideband. i looked around but nothing really answered my question... Here is a pic my buddy posted on another forum you can see how the plugs look.
http://home.cogeco.ca/~rnotarangelo1/plugs.jpg

Dr.Baby · 05-28-2006, 12:15 PM

are you running race gas?...leaded gas will burn like that.

kings_blend · 05-28-2006, 06:39 PM

its 94 octane pump gas...

zubaz91 · 08-24-2006, 06:56 AM

i got the same exact problem, have u figured it out? AFR is 11 and plugs are white after driving for an hour. also its misfiring and i have no power

TurbLu · 11-05-2006, 06:39 PM

anyone here solve these issue...

whomiked · 11-05-2006, 08:51 PM

I have the same problem.

05-28-2006, 12:13 PM	#1
kings_blend Leaky Injector Join Date: Jun 2004 Location: WINDSOR Age: 40 Posts: 112 Trader Rating: (0) Feedback Score: 0 reviews	running rich, but spark plugs show lean? Hey guys a buddy of mine has a sr20det with a full rebuild, cp pistons, eagle rods, 270 cams, greddy intake mani , peakboost exhaust mani, 1000cc injectors, gt3071r, and an AEM EMS. We got it running a few days ago on a map he had tuned for a slightly different setup, but we retarded timing a couple degrees and richened the fuel up about 10%. The ems is setup for the injectors he is using. At idle the wideband shows 11-12 afr, rich I know, at WOT it shows 11, cruising about 12-13 and and at idle you can smell the gas coming out of the exhaust pipe (no cat). But after a run on the freeway we pull the plugs and by the looks of them it seems like the car is running lean. The first is white and they get darker as the move to the fourth. I was really confused when we investigated. Could it be the wideband isnt working properly and showing its running rich? I believe the plugs more than the wideband. i looked around but nothing really answered my question... Here is a pic my buddy posted on another forum you can see how the plugs look. http://home.cogeco.ca/~rnotarangelo1/plugs.jpg

05-28-2006, 12:15 PM	#2
Dr.Baby Zilvia Addict Join Date: Jan 2005 Location: Long Beach, CA Age: 39 Posts: 604 Trader Rating: (16) Feedback Score: 16 reviews	are you running race gas?...leaded gas will burn like that. __________________ alexkors.com - blog. AKdrift - twitter & facebook follow me!

05-28-2006, 06:39 PM	#3
kings_blend Leaky Injector Join Date: Jun 2004 Location: WINDSOR Age: 40 Posts: 112 Trader Rating: (0) Feedback Score: 0 reviews	its 94 octane pump gas...

08-24-2006, 06:56 AM	#4
zubaz91 Join Date: Jun 2005 Location: boston Posts: 48 Trader Rating: (0) Feedback Score: 0 reviews	i got the same exact problem, have u figured it out? AFR is 11 and plugs are white after driving for an hour. also its misfiring and i have no power

11-05-2006, 06:39 PM	#5
TurbLu Zilvia Member Join Date: Sep 2006 Location: Las Vegas Posts: 197 Trader Rating: (0) Feedback Score: 0 reviews	anyone here solve these issue...

11-05-2006, 08:51 PM	#6
whomiked Zilvia Member Join Date: Sep 2004 Location: San Antonio Age: 37 Posts: 280 Trader Rating: (1) Feedback Score: 1 reviews	I have the same problem.