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Right Bank way Lean during open loop, perfect in closed

Post questions and answers about your engine problems.. What is this ticking sound I hear while starting? Engine not turning over? Problems with your battery... alternator? Find out here.

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maxg1989
Posted: Mon May 16, 2011 8:41 pm
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Location: michigan
Posts: 271
I have a problem i have been trying to track down for while now and can't come up with anything. I have a wideband in my car and i have been tuning with tuner cats and data logging with free scan and when i start my car up, the right side is super lean at idle and 14.7 driving in open loop. (the same side my wide band is on) i know your probably thinkin intake leak on that side, nope, checked everywhere and didnt come up with anything. The weird thing being as soon as it hits closed loop and takes feed back from the O2 sensors it corrects to 14.7 just like it should and my right side BLM in free scan is hovering around 127-130 which tells me the computer isn't addin any fule to compensate for a leak. I can't seem to figure it out. ]

any ideas ?
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 

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Rojbarker
Posted: Wed Jun 08, 2011 11:33 pm
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Location: Andover, United Kingdom
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Where Did You Hear Of Camarosource.ca?: Abob visited me in a dream and told me about it.
You using FreeScan? I seem to remember that the BLM on mine from left and right didn't match - they were massively different so I just assumed that was A)normal or B)the software was doing something weird. Mine always ran ok....
1994/L Z28 6SPDMAN, K&N CAI, Jet PCHIP. Flowmaster Cat back, 52mm Edelbrock TB, Pacesetter mid-tube headers.

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Post
maxg1989
Posted: Thu Jun 09, 2011 7:28 am
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Joined: Wed Jan 24, 2007 4:39 am
Location: michigan
Posts: 271
Rojbarker wrote:
You using FreeScan? I seem to remember that the BLM on mine from left and right didn't match - they were massively different so I just assumed that was A)normal or B)the software was doing something weird. Mine always ran ok....


yeah i am using free scan. There is a normal problem with split BLM's when you go to an aftermarket throttle body the is a "short circut" if you will int he air flow from the IAC and the manifold that needs to be sealed, and that will usually get your BLM's pretty close together. I did a half AZz fix and it worked pretty well, but i still have a huge difference in BLMs.

heres a link that can help you out.

http://members.cox.net/chipsbyal/page/idle/tbi.htm
95 z28 6-SPEED, dark green, t tops, 48k, Skip shift Delete, K&N,SLP LM2, c5 Corvette wheels 275 45 17 kumho MX rubbers
 


 

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