HELP, CAR SUDDENLY GOT LEAN - Toyota Yaris Forums

Faraz_Shaikh · 03-18-2011, 01:55 PM

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

Yoda · 03-18-2011, 08:42 PM

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?

cali yaris · 03-19-2011, 01:04 AM

How are you monitoring air/fuel ratio in real time?

Faraz_Shaikh · 03-19-2011, 04:57 AM

k

Faraz_Shaikh · 03-19-2011, 04:58 AM

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

cali yaris · 03-19-2011, 11:23 AM

I asked "how" you monitor the AFR

Yoda · 03-19-2011, 11:31 PM

Check if your maf is dirty. Do you have a gauge in your car which u can use to monitor your a/f?

Attitude · 03-22-2011, 11:08 AM

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

ilikerice · 03-22-2011, 11:36 AM

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?

cali yaris · 03-22-2011, 12:04 PM

If he's not going to answer simple questions = I can't be helpful at all. Sorry!

Attitude · 03-23-2011, 10:19 AM

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.

Attitude · 03-23-2011, 10:20 AM

car leans out as the the boost comes, at around 3000 to 3500

ilikerice · 03-24-2011, 08:40 AM

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.

cali yaris · 03-24-2011, 12:54 PM

Quote:

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

Assuming the parts you've installed were installed correctly and are working properly, you have a tuning problem. That set up should provide more than enough fuel.

How do the plugs look? Post a closeup of a spark plug.

Faraz_Shaikh · 03-25-2011, 04:27 AM

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.

ilikerice · 03-25-2011, 08:16 AM

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

cali yaris · 03-25-2011, 11:05 AM

Quote:

the car was running perfect on same setup infact with small injectors of 225cc

Then why did you change the size?

Focus_Sh1ft · 03-25-2011, 02:16 PM

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.

03-18-2011, 01:55 PM	#1
Faraz_Shaikh Drives: Toyota Vitz Join Date: Sep 2010 Location: Pakistan Posts: 42	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

03-19-2011, 01:04 AM	#3
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	How are you monitoring air/fuel ratio in real time? __________________ 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.

03-19-2011, 11:23 AM	#6
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	I asked "how" you monitor the AFR __________________ 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.

03-22-2011, 12:04 PM	#10
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	If he's not going to answer simple questions = I can't be helpful at all. Sorry! __________________ 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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03-18-2011, 08:42 PM	#2
Yoda Drives: 2008 Black Sedan Join Date: Oct 2008 Location: FL Posts: 966	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?

03-19-2011, 04:57 AM	#4
Faraz_Shaikh Drives: Toyota Vitz Join Date: Sep 2010 Location: Pakistan Posts: 42	k

03-19-2011, 04:58 AM	#5
Faraz_Shaikh Drives: Toyota Vitz Join Date: Sep 2010 Location: Pakistan Posts: 42	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

03-19-2011, 11:31 PM	#7
Yoda Drives: 2008 Black Sedan Join Date: Oct 2008 Location: FL Posts: 966	Check if your maf is dirty. Do you have a gauge in your car which u can use to monitor your a/f?

03-22-2011, 11:08 AM	#8
Attitude Drives: Vitz Join Date: Aug 2009 Location: Pakistan Posts: 21	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
ilikerice Drives: 2010 black yaris Join Date: Oct 2010 Location: savannah, ga Posts: 2,868	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?

03-23-2011, 10:19 AM	#11
Attitude Drives: Vitz Join Date: Aug 2009 Location: Pakistan Posts: 21	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.

03-23-2011, 10:20 AM	#12
Attitude Drives: Vitz Join Date: Aug 2009 Location: Pakistan Posts: 21	car leans out as the the boost comes, at around 3000 to 3500

03-24-2011, 08:40 AM	#13
ilikerice Drives: 2010 black yaris Join Date: Oct 2010 Location: savannah, ga Posts: 2,868	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.

03-25-2011, 04:27 AM	#15
Faraz_Shaikh Drives: Toyota Vitz Join Date: Sep 2010 Location: Pakistan Posts: 42	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.

03-25-2011, 08:16 AM	#16
ilikerice Drives: 2010 black yaris Join Date: Oct 2010 Location: savannah, ga Posts: 2,868	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

03-25-2011, 02:16 PM	#18
Focus_Sh1ft Drives: 08 Yaris Turbo; 06 tC Turbo Join Date: Jan 2010 Location: New Jersey Posts: 875	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.