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03-18-2011, 01:55 PM | #1 |
Drives: Toyota Vitz Join Date: Sep 2010
Location: Pakistan
Posts: 42
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HELP, CAR SUDDENLY GOT LEAN
Hello experts
ive installed turbo kit in my yaris 1szfe, boost im running is 0.5 bar, couple of weeks back car suddenly got lean, afr is 14, i hear knock sound as boost comes, ive done all efforts, changed the fuel pump, serviced the injectors, fpr is set to 60psi, fpr was set to same before too, i did nothing but suddenly one day i started hearing knock, when i checked the afr it was 14. Ive even reset the ecu, to control the fueling i am using fcon mini, ive checked that as well but can find no problem in it, i am attaching the pic of fcon as well. kindly help me |
03-18-2011, 08:42 PM | #2 |
Drives: 2008 Black Sedan Join Date: Oct 2008
Location: FL
Posts: 966
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what do you mean by serviced the injectors? had them flow tested? have you tried to add more fuel with the fcon? Are you sure you are hearing engine knock?
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03-19-2011, 01:04 AM | #3 |
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Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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How are you monitoring air/fuel ratio in real time?
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03-19-2011, 04:57 AM | #4 |
Drives: Toyota Vitz Join Date: Sep 2010
Location: Pakistan
Posts: 42
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k
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03-19-2011, 04:58 AM | #5 |
Drives: Toyota Vitz Join Date: Sep 2010
Location: Pakistan
Posts: 42
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yes thats the engine knock, and flow of injectors have been checked its perfect, i just dont check afr all the time, once its tuned its checked, and then it runs ok for the rest of time
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03-19-2011, 11:23 AM | #6 |
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Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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I asked "how" you monitor the AFR
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03-19-2011, 11:31 PM | #7 |
Drives: 2008 Black Sedan Join Date: Oct 2008
Location: FL
Posts: 966
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Check if your maf is dirty. Do you have a gauge in your car which u can use to monitor your a/f?
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03-22-2011, 11:08 AM | #8 |
Drives: Vitz Join Date: Aug 2009
Location: Pakistan
Posts: 21
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folks
today i even installed injectors of 4efte, 300cc, and fpr was set to 60psi but still knock was there. now i think there is something wrong with ecu |
03-22-2011, 11:36 AM | #9 |
Drives: 2010 black yaris Join Date: Oct 2010
Location: savannah, ga
Posts: 2,868
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ok.. so you hear a knocking noise.. could this also be a rod knock? a video would be helpful.. and i think people are asking you if you have a A/F guage to see it lean out on your dash.. do you have one of these? and at what rpm/boost is it leaning out?
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03-22-2011, 12:04 PM | #10 |
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Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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If he's not going to answer simple questions = I can't be helpful at all. Sorry!
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
03-23-2011, 10:19 AM | #11 |
Drives: Vitz Join Date: Aug 2009
Location: Pakistan
Posts: 21
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no i'm not having an afr gauge, i borrowed from one of my friend to check the afr and it was 13 to 14. The car gets lean as the boost comes, if i slightly push the peddle(dont let the boost come) so there isnt any knock.
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03-23-2011, 10:20 AM | #12 |
Drives: Vitz Join Date: Aug 2009
Location: Pakistan
Posts: 21
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car leans out as the the boost comes, at around 3000 to 3500
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03-24-2011, 08:40 AM | #13 |
Drives: 2010 black yaris Join Date: Oct 2010
Location: savannah, ga
Posts: 2,868
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sounds like a tunning issue more then anything. are you using a wideband a/f sensor? i would suggest getting a A/F guage and permently installing that for your benifit. are you able to pull up your map via laptop? im not familiar with fcon.
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03-24-2011, 12:54 PM | #14 | |
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Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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Quote:
How do the plugs look? Post a closeup of a spark plug.
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
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03-25-2011, 04:27 AM | #15 |
Drives: Toyota Vitz Join Date: Sep 2010
Location: Pakistan
Posts: 42
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ive just installed new plugs of zex, now i have installed injectors of 4efte which are 300cc, the car is rich on idle man, it gives black smoke but as boost comes while driving, knock is heard, yes i am planning to buy a/f sensor with gauge in a month or so, but the shocking thing is the car was running perfect on same setup infact with small injectors of 225cc and suddenly it created this problem, i am just wondering if anyone is having the diagram of fcon mini, the nuts on it are not giving any hint that what are its functions.
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03-25-2011, 08:16 AM | #16 |
Drives: 2010 black yaris Join Date: Oct 2010
Location: savannah, ga
Posts: 2,868
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just a thought.. could it have been bad gas you may have gotten? are you still running on the same tank of gas still? just a thought that crossed my mind. other then that, im helpless
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03-25-2011, 11:05 AM | #17 | |
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Drives: 07 Yaris Turbo Join Date: May 2007
Location: Canoga Park, CA
Posts: 14,859
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Quote:
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Micro Image forums, online store and shop are now closed. It was a great eight year run, but it was time to focus on other things. I'm still selling parts on eBay under micro*image seller ID and customers can still make requests for anything specific. |
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03-25-2011, 02:16 PM | #18 |
Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010
Location: New Jersey
Posts: 875
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Just a thought, since I'm not entirely sure if this works both ways...
When you installed new plugs, did you install a plug with a larger gap? I know going from larger to smaller gap means you're going to have less of a complete burn, hence a richer mixture. So that implies going from smaller to larger would provide a more complete burn and be potentially leaner. |
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