Firs Dyno today and not good
01-14-2005, 02:06 PM
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Firs Dyno today and not good I got my car dynoed today, and the A/F ratio showed I was running WAY lean, it was anywhere from 16 to even 18 
on the first run and pretty much the same on the second run. We never got a full run in, he shut down around 4200 rpms so nothing got messed up. I just recently installed LT headers, 3" TD's, !air, !egr, !cats. Would this cause it to run this lean, I always thought it would cause it to run rich 
. Im going to setup a time to get it Tuned but want to make sure that there is no other problem. Thanks
on the first run and pretty much the same on the second run. We never got a full run in, he shut down around 4200 rpms so nothing got messed up. I just recently installed LT headers, 3" TD's, !air, !egr, !cats. Would this cause it to run this lean, I always thought it would cause it to run rich . Im going to setup a time to get it Tuned but want to make sure that there is no other problem. Thanks 
01-15-2005, 09:27 PM
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You are correct in that those mods "should" make your car run rich. At that kind of A/F ratio, you better get that thing tuned in a hurry ! !
......I'd be surprised if you haven't already done some damage, if it's been driven a lot.
Good luck ! !
......I'd be surprised if you haven't already done some damage, if it's been driven a lot.
Good luck ! !
01-15-2005, 10:00 PM
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...I've always heard that headers will make you run leaner. Most people just think they are running rich because they can smell gas due to the deletion of the cats. Also, the placement of the wideband sensor can affect the a/f ratio readings...
01-16-2005, 01:21 AM
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Well, LTs do often make you run rich b/c at part throttle your fuel trims go further positive and these are also applied to wot. What did the 02 sensors show for comparison?
01-17-2005, 07:59 AM
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Im going to get it tuned today or wednesday, I have been driving it more than usual(before I found it was lean), I hope I havent F'd anything up 
.
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01-17-2005, 08:04 AM
#6
Originally Posted by luv2spd
Well, LTs do often make you run rich b/c at part throttle your fuel trims go further positive and these are also applied to wot. What did the 02 sensors show for comparison?
If they go negative, then the car is running rich and removing fuel to compensate.
