SES Light/Header install
Thread Starter
Teching In
Joined: Mar 2005
Posts: 5
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SES Light/Header install Own a 99 Ls1 and did flowtech header install. Im throwing a SES light and dont have the rear 02's installed. How do I go about testing to see if I am running rich or lean w/ out software and how do I check the code w/ out a code reader. Thanks
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Q: How do I check on my LS1 whether im running rich or lean w/out use of software and by not starring at and smelling the exhaust
Q: How do I get the codes w/ out a code reader????
Thanks
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Q: How do I check on my LS1 whether im running rich or lean w/out use of software and by not starring at and smelling the exhaust
Q: How do I get the codes w/ out a code reader????
Thanks
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
A: You can't .... only ways to gauge rich/lean is to do the "smell" test or to log w/a scanner software or at minimum a wideband O2 sensor to see if you're rich/lean ... if your headers turn bright red... you're too lean 
A: Not possible on OBDII, you need to get it read via a code reader/scanner ..
A: Not possible on OBDII, you need to get it read via a code reader/scanner ..
Thread Starter
Teching In
Joined: Mar 2005
Posts: 5
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Originally Posted by horist
A: You can't .... only ways to gauge rich/lean is to do the "smell" test or to log w/a scanner software or at minimum a wideband O2 sensor to see if you're rich/lean ... if your headers turn bright red... you're too lean
A: Not possible on OBDII, you need to get it read via a code reader/scanner ..
A: Not possible on OBDII, you need to get it read via a code reader/scanner ..
TECH Senior Member
Joined: Nov 2001
Posts: 7,036
Likes: 1
From: Lake Zurich, IL
no rears won't hurt performance... just the annoying light...
You can try grabbing the O2 sensor voltage (0 to 1 volt) ... w/out any software not much you can tell though... the O2 sensors vary high low high low , and the PCM adds/removes fuel to keep the O2s averaging 14.7:1 ... at WOT they're not very accurate and w/out some way to log ... it'll be hard to watch a voltmeter while accelerating at WOT
You can try grabbing the O2 sensor voltage (0 to 1 volt) ... w/out any software not much you can tell though... the O2 sensors vary high low high low , and the PCM adds/removes fuel to keep the O2s averaging 14.7:1 ... at WOT they're not very accurate and w/out some way to log ... it'll be hard to watch a voltmeter while accelerating at WOT
