17.0 AFR Cruising Hiway
#1
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From: Jacksonville NC
17.0 AFR Cruising Hiway
Would this be causing me misfires?
I installed (well Blown SS installed) my LC1 wideband and its showing ~17 AFR when I am cruising at 60mph, then I feel the car jerk......I want to say misfire. Then I see it richen up to about 13.5
Is this a tune issue, or a mechanical issue. I am due for a tune this week and I'd rather not take the car in for a tune if theres something I need to fix. The car runs great the rest of the time and stays 14.7 to 15.0 unless I give it enough gas to get into boost then I run ~10.5AFR.
Any input is greatly appeciated!
Last edited by KraZy; 06-17-2006 at 08:26 PM.
#7
Stock Oz PCM's run lean cruise into the 17's.
Word is to go high 15's at best, so many richen up a little.
Bottom line its your tune, if its deliberately that lean, then try a little richer at cruise.
Word is to go high 15's at best, so many richen up a little.
Bottom line its your tune, if its deliberately that lean, then try a little richer at cruise.
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#10
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From: Jacksonville NC
I just want to make sure this is a tune issue not a mechanical issue. The car goes in for a tune this week.
I am still running a procharger tune on the turbo........the most boost I see is 2lbs right now and its 10.0afr while boosted.
I am still running a procharger tune on the turbo........the most boost I see is 2lbs right now and its 10.0afr while boosted.
#11
Originally Posted by ringram
Stock Oz PCM's run lean cruise into the 17's.
#12
no lean cruise mode in American PCM's.....lean reading could also mean on the verge of or getting into a lean misfire....find out which cell is causin it and reduce spark a couple degrees or richen that cell up with fuel
#14
Originally Posted by oange ss
no lean cruise mode in American PCM's.....lean reading could also mean on the verge of or getting into a lean misfire....find out which cell is causin it and reduce spark a couple degrees or richen that cell up with fuel
#18
Because you are causing a cylinder power imbalance. If it is detonation you have the air fuel mixture igniting early and actually pushing against the piston. If it is a misifre then instead of having the piston pushed back down it has to be pulled back down throwing the balance off
#19
Originally Posted by KraZy
Why does it buck when its running that lean?
.
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Could be the converter locking and unlocking......if it's an aftermarket stall. They can get a little touchy sometimes if you are way off on the tune. Misfires, knock, etc.
#20
it bucks because it is misfiring and flipping the Air Fuel Ratio all over the place.
It was not uncommon for mine to jump around from 18:1 down to 13:1... Makes it shudder and buck like a mule (and this is a 6-speed car).
I richened mine up a hair and added some more timing in to stabilize the cruising.
It was not uncommon for mine to jump around from 18:1 down to 13:1... Makes it shudder and buck like a mule (and this is a 6-speed car).
I richened mine up a hair and added some more timing in to stabilize the cruising.