Spark plug diagnosis and lean condition - Toyota Yaris Forums

camelll · 04-03-2009, 02:40 PM

=]

LtNoogie · 04-03-2009, 02:48 PM

Mike,

Compare your plugs to this pdf file from Bosch.

yaris-me · 04-03-2009, 03:09 PM

It's just my opinion. The plugs look oily on the threads. It also looks like it's not burning cleanly. I have no experience with supercharged engines.

eTiMaGo · 04-06-2009, 12:13 PM

Hmm curious... I am looking through the repair manual to see what they say about this particular code, "system too lean", and quite a variety of common causes...

Like you said it only really happens at idle, so my gut feeling is it has something to do with your PCV hoses. I know you are 99% sure that's not it, but that's still a 1% chance that it might be

I mean, idle is when you have the strongest vacuum in the manifold, correct? so if there's a leak somewhere, it would thus probably have the biggest effect in this condition, and not while the throttle is opened wider.

And, Occam's razor... You messed with the oil catch tank, a problem happened, always look for the simplest explanation first

Doc Zaius · 04-07-2009, 12:03 PM

This is all good to know. I'll definitely be getting a catch can at some point soon.

kurokoma-kun · 04-08-2009, 10:21 AM

Quote:

Originally Posted by Doc Zaius

This is all good to know. I'll definitely be getting a catch can at some point soon.

Sorry for the thread jack cammelll, I'm just grateful to you for providing the nudge to get my catch tank!

Doc, if you buy one I totally recommend getting decent heater hose and trashing that shitty clear stuff that seems to come with most kits. I installed mine on Saturday, using one piece of good hose... car seemed ok at first but ran like crap yesterday, the piece of clear hose was all sucked in--replaced it last night and now it runs like a champ!

Why do companies do this, make it harder on customers to save a few cents on a length of hose?! grarrr

LtNoogie · 04-08-2009, 10:33 AM

My catch can just arrived at my P.O. center. I'll install it this weekend.

YarisSedan · 04-08-2009, 12:28 PM

Ive always had a slightly lean condition since i installed my weapon r intake. Because of the relocation of the MAf sensor closer to the throttle body. So much that the fuel trim was starting to max out.

LtNoogie · 04-08-2009, 09:51 PM

You should sell your boost gauge to KK and buy a vacuum/boost gauge like I have. You would have seen that your vacuum was off.

LtNoogie · 04-08-2009, 10:47 PM

I've got the C2 series. It's a good thing Autometer has so many lines of gauges, we've gotta be individualistic. Is yours digital like Mike's or full range electric?

Here's mine.

kurokoma-kun · 04-08-2009, 11:04 PM

mechanical

model 5907

ES series has black faces, just hadda have all black

LtNoogie · 04-08-2009, 11:21 PM

Quote:

Originally Posted by kurokoma-kun

mechanical

model 5907

ES series has black faces, just hadda have all black

?

kurokoma-kun · 04-09-2009, 10:58 AM

Quote:

Originally Posted by LtNoogie

?

thats the one

Garm helped me choose it, I originally wanted one with some crazy high boost range, 7 psi would barely show on some boost gauges

kurokoma-kun · 04-09-2009, 11:06 AM

when I installed the catch tank I used the screw type also, got a mix of shitty stock clips and decent clamps now.

mmmm I like the blue displays on the cobalts, mine are red lighted, my tach is like the baleful burning eye of Sauron, lol!!

well I guess since this is a long weekend coming up I will finally make an effort and install my gauges, at least get all the wires pulled and so forth

PETERPOOP · 04-08-2009, 11:10 PM

this is the model i am getting. All Cobalts...

LtNoogie · 04-08-2009, 11:22 PM

Quote:

Originally Posted by PETERPOOP

this is the model i am getting. All Cobalts...

I almost bought Cobalt but don't remember why I chose C2 instead.

PETERPOOP · 04-08-2009, 11:31 PM

Because you wanted to look like a smurf while driving at night. That's what you told me....

LtNoogie · 04-09-2009, 11:07 AM

I also installed the Autometer dimmer. I was tired of driving around with my face lit up bright blue at night. My wideband LED display does not seem to dim very much although it is supposed to auto-dim.

04-03-2009, 02:40 PM	#1
camelll Drives: 07 sedan Join Date: Jun 2007 Location: Home Posts: 108	- =] Last edited by camelll; 07-03-2010 at 01:45 PM.

04-06-2009, 12:13 PM	#4
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	Hmm curious... I am looking through the repair manual to see what they say about this particular code, "system too lean", and quite a variety of common causes... Like you said it only really happens at idle, so my gut feeling is it has something to do with your PCV hoses. I know you are 99% sure that's not it, but that's still a 1% chance that it might be I mean, idle is when you have the strongest vacuum in the manifold, correct? so if there's a leak somewhere, it would thus probably have the biggest effect in this condition, and not while the throttle is opened wider. And, Occam's razor... You messed with the oil catch tank, a problem happened, always look for the simplest explanation first __________________ The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ...

04-07-2009, 12:03 PM	#5
Doc Zaius Lurker supreme! View User's Garage Drives: old and boosted! Join Date: Nov 2006 Location: Ottawa, ON, Canada Posts: 792	This is all good to know. I'll definitely be getting a catch can at some point soon. __________________ 2006 Red Blitzed RS 5-door

04-08-2009, 10:33 AM	#7
LtNoogie View User's Garage Drives: '08 Bayou Blue LB AT Join Date: Oct 2008 Location: West Hills, CA Posts: 2,517	My catch can just arrived at my P.O. center. I'll install it this weekend. __________________ aFe Intake \| Blitz Supercharger \| Megan Header \| TRD Exhaust \| NST Pulley Set TRD Shocks/Struts \| Tanabe NF210 Springs \| TRD Sway Bar \| Motegi TRAKLITE wheels \| Kuhmo Ecsta XS R1 Concepts slotted rotors \| Carbotech 1521 brake pads \| stainless steel brake lines \| Seibon vented carbon fiber hood

04-08-2009, 09:51 PM	#9
LtNoogie View User's Garage Drives: '08 Bayou Blue LB AT Join Date: Oct 2008 Location: West Hills, CA Posts: 2,517	You should sell your boost gauge to KK and buy a vacuum/boost gauge like I have. You would have seen that your vacuum was off. __________________ aFe Intake \| Blitz Supercharger \| Megan Header \| TRD Exhaust \| NST Pulley Set TRD Shocks/Struts \| Tanabe NF210 Springs \| TRD Sway Bar \| Motegi TRAKLITE wheels \| Kuhmo Ecsta XS R1 Concepts slotted rotors \| Carbotech 1521 brake pads \| stainless steel brake lines \| Seibon vented carbon fiber hood

04-03-2009, 03:09 PM	#3
yaris-me Learn to Relax Drives: 2007, Meteorite, LB Join Date: Dec 2008 Location: Anaheim, CA Posts: 2,070	It's just my opinion. The plugs look oily on the threads. It also looks like it's not burning cleanly. I have no experience with supercharged engines.

04-08-2009, 12:28 PM	#8
YarisSedan Drives: 08 Yaris Sedan Join Date: Oct 2008 Location: California - Bay Area Posts: 2,773	Ive always had a slightly lean condition since i installed my weapon r intake. Because of the relocation of the MAf sensor closer to the throttle body. So much that the fuel trim was starting to max out.

04-08-2009, 11:04 PM	#11
kurokoma-kun Drives: 2007 Yaris HB Join Date: Apr 2007 Location: my own little world Posts: 1,256	mechanical model 5907 ES series has black faces, just hadda have all black

04-09-2009, 11:06 AM	#14
kurokoma-kun Drives: 2007 Yaris HB Join Date: Apr 2007 Location: my own little world Posts: 1,256	when I installed the catch tank I used the screw type also, got a mix of shitty stock clips and decent clamps now. mmmm I like the blue displays on the cobalts, mine are red lighted, my tach is like the baleful burning eye of Sauron, lol!! well I guess since this is a long weekend coming up I will finally make an effort and install my gauges, at least get all the wires pulled and so forth

04-08-2009, 11:10 PM	#15
PETERPOOP View User's Garage Drives: 08 white liftback Join Date: Oct 2008 Location: Oahu Posts: 3,674	this is the model i am getting. All Cobalts...

04-08-2009, 11:31 PM	#17
PETERPOOP View User's Garage Drives: 08 white liftback Join Date: Oct 2008 Location: Oahu Posts: 3,674	Because you wanted to look like a smurf while driving at night. That's what you told me....

04-09-2009, 11:07 AM	#18
LtNoogie View User's Garage Drives: '08 Bayou Blue LB AT Join Date: Oct 2008 Location: West Hills, CA Posts: 2,517	I also installed the Autometer dimmer. I was tired of driving around with my face lit up bright blue at night. My wideband LED display does not seem to dim very much although it is supposed to auto-dim. __________________ aFe Intake \| Blitz Supercharger \| Megan Header \| TRD Exhaust \| NST Pulley Set TRD Shocks/Struts \| Tanabe NF210 Springs \| TRD Sway Bar \| Motegi TRAKLITE wheels \| Kuhmo Ecsta XS R1 Concepts slotted rotors \| Carbotech 1521 brake pads \| stainless steel brake lines \| Seibon vented carbon fiber hood