running lean
Thread Starter
Racer
Joined: Oct 2006
Posts: 386
Likes: 1
From: Scott LA
running lean
I have installed lt headers and it appears that cylinder 3 & 5 are running lean. The header tubes are discolored more than the others cylinders. I have my long term fuel trim on both banks between 0 and -2 and at wot my o2 sensors are reading from 89 to 91. The left engine bank is the side with the ltft reading -2. I also hear a ticking noise from that side of the engine, could it be possible loose vavle? has any one had valves out of adjustment at 10,000 miles?
Drifting
Joined: Jul 2005
Posts: 1,533
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From: az
Originally Posted by layjzay
I have installed lt headers and it appears that cylinder 3 & 5 are running lean. The header tubes are discolored more than the others cylinders. I have my long term fuel trim on both banks between 0 and -2 and at wot my o2 sensors are reading from 89 to 91. The left engine bank is the side with the ltft reading -2. I also hear a ticking noise from that side of the engine, could it be possible loose vavle? has any one had valves out of adjustment at 10,000 miles?
Tech Contributor
Joined: Mar 2003
Posts: 12,094
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From: Colorado Springs, CO
St. Jude Donor '08-'09-'10-'11
At under +24% ltft's your car isnt running lean it is at stoic since the car maintains the 14.7:1 AF by itself. If it were over the car's ability to be 14.7:1 then you would have a check engine light. If you have .91 volts for the narrow band o2's then you car can be at 11.8-12:1 under WOT but you should check with a wideband.
