wierd AFR issue... - SRT Forums

cracka350z · 02-14-2013, 09:13 AM

was driving today, punched it, boosted great then i let off and while cruising it was sitting between 12.5-13.5 afr. then at idle it would be around 13.5-14.1. didnt feel rough or anything really...no dying or misfiring that i could feel. tried punching it just to see and it dropped to about 10.5 afr but pulled strong. let off right away as not to cause any more problems. got home, restarted the car and it seems to idle fine. any ideas? very lost lol.

tunerlover3 · 02-14-2013, 01:40 PM

So whats the issue?

cracka350z · 02-14-2013, 02:53 PM

Quote: Originally Posted by tunerlover3

So whats the issue?

the afr dropping like that. freaked me the fuck out. at idle it smelled rich too. then went away after restart. (pretty much cliffnotes). trying to figure out what would cause it. stuck/dirty injector? plug not firing all the way? just dont want to go on driving it normally if its gonna come back worse next time. soooo...just trying to figure it out. not a noob...just been out of the srt game for about 2 yrs.

tunerlover3 · 02-14-2013, 06:49 PM

Why it dropped to 12.5-13.5 while cruising? Then was 13.5-14.1 at idle?

I wouldnt really worry over that. It could be a slow upper o2 and thats why its taking a while for the AFR to come back into normal. What are your fuel trims doing when the its doing this?

cracka350z · 02-14-2013, 10:27 PM

Quote: Originally Posted by tunerlover3

Why it dropped to 12.5-13.5 while cruising? Then was 13.5-14.1 at idle?

I wouldnt really worry over that. It could be a slow upper o2 and thats why its taking a while for the AFR to come back into normal. What are your fuel trims doing when the its doing this?

It didnt slowly come back to normal. Once i got home and restarted the car it went back to normal. The leanest it got even letting off the gas was 16.5. Long and short both said 0.0 while throttle was pressed.

ninjaboy76 · 02-15-2013, 02:25 AM

Was the car completely cooled down when you restarted it and it "went back to normal"?

cracka350z · 02-15-2013, 02:55 AM

Quote: Originally Posted by ninjaboy76

Was the car completely cooled down when you restarted it and it "went back to normal"?

nope. pulled into the driveway, shut it down...waited about 15 seconds restarted. drove it today with no weirdness. gonna check plugs and probably replace wires/coil pack for shits and giggles. gives me a reason to buy new stuff

tunerlover3 · 02-15-2013, 06:41 AM

Quote: Originally Posted by cracka350z

It didnt slowly come back to normal. Once i got home and restarted the car it went back to normal. The leanest it got even letting off the gas was 16.5. Long and short both said 0.0 while throttle was pressed.

How old is your wideband sensor?

I wouldnt even worry about this honestly.

02-14-2013, 09:13 AM	#1 (permalink)
cracka350z SRTforums Member Join Date: Sep 2009 Member Number: 75061 Location: Morlautern Germ Posts: 711	wierd AFR issue... was driving today, punched it, boosted great then i let off and while cruising it was sitting between 12.5-13.5 afr. then at idle it would be around 13.5-14.1. didnt feel rough or anything really...no dying or misfiring that i could feel. tried punching it just to see and it dropped to about 10.5 afr but pulled strong. let off right away as not to cause any more problems. got home, restarted the car and it seems to idle fine. any ideas? very lost lol. __________________ 1999 Toyota Aristo - Sold 05 NSrt-4 - 30r, 900cc inj, DSP, etc. The fun has returned

02-14-2013, 01:40 PM	#2 (permalink)
tunerlover3 Fresh Meat Moderator Join Date: Dec 2009 Member Number: 76568 Location: Chicago Posts: 16,617	So whats the issue? __________________ Diablo CMR tuner ~Dan~ 2004 Black Neon SRT4: E85 stock turbo SOLD 310HP 436TQ 2004 Eblue Neon SRT4: E85 5558 XXXHP XXXTQ

02-14-2013, 02:53 PM	#3 (permalink)
cracka350z SRTforums Member Join Date: Sep 2009 Member Number: 75061 Location: Morlautern Germ Posts: 711	Quote: Originally Posted by tunerlover3 So whats the issue? the afr dropping like that. freaked me the fuck out. at idle it smelled rich too. then went away after restart. (pretty much cliffnotes). trying to figure out what would cause it. stuck/dirty injector? plug not firing all the way? just dont want to go on driving it normally if its gonna come back worse next time. soooo...just trying to figure it out. not a noob...just been out of the srt game for about 2 yrs. __________________ 1999 Toyota Aristo - Sold 05 NSrt-4 - 30r, 900cc inj, DSP, etc. The fun has returned

02-14-2013, 06:49 PM	#4 (permalink)
tunerlover3 Fresh Meat Moderator Join Date: Dec 2009 Member Number: 76568 Location: Chicago Posts: 16,617	Why it dropped to 12.5-13.5 while cruising? Then was 13.5-14.1 at idle? I wouldnt really worry over that. It could be a slow upper o2 and thats why its taking a while for the AFR to come back into normal. What are your fuel trims doing when the its doing this? __________________ Diablo CMR tuner ~Dan~ 2004 Black Neon SRT4: E85 stock turbo SOLD 310HP 436TQ 2004 Eblue Neon SRT4: E85 5558 XXXHP XXXTQ

02-14-2013, 10:27 PM	#5 (permalink)
cracka350z SRTforums Member Join Date: Sep 2009 Member Number: 75061 Location: Morlautern Germ Posts: 711	Quote: Originally Posted by tunerlover3 Why it dropped to 12.5-13.5 while cruising? Then was 13.5-14.1 at idle? I wouldnt really worry over that. It could be a slow upper o2 and thats why its taking a while for the AFR to come back into normal. What are your fuel trims doing when the its doing this? It didnt slowly come back to normal. Once i got home and restarted the car it went back to normal. The leanest it got even letting off the gas was 16.5. Long and short both said 0.0 while throttle was pressed. __________________ 1999 Toyota Aristo - Sold 05 NSrt-4 - 30r, 900cc inj, DSP, etc. The fun has returned

02-15-2013, 02:25 AM	#6 (permalink)
ninjaboy76 SRTforums Member Join Date: Aug 2011 Member Number: 85809 Location: Wichita, KS Posts: 12	Was the car completely cooled down when you restarted it and it "went back to normal"?

02-15-2013, 02:55 AM	#7 (permalink)
cracka350z SRTforums Member Join Date: Sep 2009 Member Number: 75061 Location: Morlautern Germ Posts: 711	Quote: Originally Posted by ninjaboy76 Was the car completely cooled down when you restarted it and it "went back to normal"? nope. pulled into the driveway, shut it down...waited about 15 seconds restarted. drove it today with no weirdness. gonna check plugs and probably replace wires/coil pack for shits and giggles. gives me a reason to buy new stuff __________________ 1999 Toyota Aristo - Sold 05 NSrt-4 - 30r, 900cc inj, DSP, etc. The fun has returned

02-15-2013, 06:41 AM	#8 (permalink)
tunerlover3 Fresh Meat Moderator Join Date: Dec 2009 Member Number: 76568 Location: Chicago Posts: 16,617	Quote: Originally Posted by cracka350z It didnt slowly come back to normal. Once i got home and restarted the car it went back to normal. The leanest it got even letting off the gas was 16.5. Long and short both said 0.0 while throttle was pressed. How old is your wideband sensor? I wouldnt even worry about this honestly. __________________ Diablo CMR tuner ~Dan~ 2004 Black Neon SRT4: E85 stock turbo SOLD 310HP 436TQ 2004 Eblue Neon SRT4: E85 5558 XXXHP XXXTQ

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