 Need your help with AFR on 2nd gen 3sgte swap |
 Apr 19, 2013 - 12:25 PM
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Enthusiast  Joined Aug 14, '05 From St. Paul, MN(USA) Currently Offline Reputation: 8 (100%)  |
94 celica gt with 2nd gen 3sgte swap. Everything is stock with AEM EMS. Harness done by Dr.Tweak. The AFR would read 14-15 from cold start but when it starts to warm up it would gradually move to 16-17. Is this normal? Here is a short video of it. Any clues or suggestions would help Thanks in advance
http://www.youtube.com/watch?v=Bic419UjtsE |
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Apr 20, 2013 - 11:32 AM
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 Enthusiast Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) |
QUOTE (garin @ Apr 20, 2013 - 8:48 AM)  my problem is not vacuum. it reads 18-22 inhg at idle. Then work your way down the list I posted and check your exhaust and mechanical timing. But whenever I have a vac leak, even a small one, I first notice it as a lean reading on the wideband. I was just dealing with this issue last week. At idle I was very lean, while at cruising it was fine and my vac readings were about 18inhg. Poking around the engine bay I first found that a small vac cap that I was using on my AC Idle up valve had blown off. I fixed that, and now my car was idling at about 16 afr. Then I did some more investigating and found that my downpipe is starting to develop a small crack right next to the factory o2 sensor. I wrapped the crack in some exhaust heat wrap and put a clamp around it. Now im back to a 14.7 idle. So in my case, it was two issues that caused it. You also have to remember that on a 2nd gen 3sgte, a "vac leak" means any air leak past the AFM. So the problem could also be cause by a leak in your intake piping. This post has been edited by lagos: Apr 20, 2013 - 11:38 AM -------------------- 15PSI - 30MPG - Megasquirt Tuned
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Posts in this topic
team_omega Need your help with AFR on 2nd gen 3sgte swap Apr 19, 2013 - 12:25 PM
garin my second gen does this too Apr 19, 2013 - 1:50 PM
team_omega QUOTE (garin @ Apr 19, 2013 - 1:50 P... Apr 19, 2013 - 2:03 PM garin im not sure my car smells rich... but i still get ... Apr 19, 2013 - 2:41 PM lagos No its not normal.
Two main things that will cau... Apr 19, 2013 - 8:13 PM team_omega Thanks lagos I will check on that sometime this we... Apr 19, 2013 - 8:57 PM garin my problem is not vacuum. it reads 18-22 inhg at i... Apr 20, 2013 - 7:48 AM garin QUOTE (lagos @ Apr 20, 2013 - 12:32 ... Apr 22, 2013 - 4:19 PM |
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