Multiple cylinder misfire under boost - Toyota Yaris Forums

LtNoogie · 10-30-2009, 07:56 PM

Several months ago at an autox event, while under boost the Yaris posted a CEL and went into limp mode in the middle of the race. The codes showed misfires on multiple cylinders. Fortunately, the CEL cleared and the car ran fine if I stayed out of boost.

When I pulled the spark plugs, they were all coated with a dry reddish deposit. Today I put in a fresh set and the car runs as well as it did right after the blower was installed. The SC typically puts out 7lbs of boost. I use Shell V-Power gas at 91 octane.

What causes this type of deposit? The plugs are NGK BKR7EIX Iridium with a heat range of 7. The plugs have been in since December of last year.

I'm also running a set of 1ZZ injectors. AFR stays at 14.7 under normal driving conditions and then goes to 11-12 under boost.

scape · 10-30-2009, 09:17 PM

fuel with additives

LtNoogie · 10-30-2009, 09:20 PM

Maybe I'll try someone else's 91 octane for a year and keep checking the plugs.

thebarber · 10-30-2009, 10:07 PM

isn't 14.7 a bit lean?

yaris-me · 10-30-2009, 11:47 PM

It looks slightly rich, which is because of the 11-12 AFR. The deposits probably cause the misfire and replacing the plugs is the best thing to do. Probably best to replace plugs on a regular basis.

cali yaris · 10-31-2009, 01:14 AM

Ten months on a boosted car is pretty long for plugs. I would check them more often.

What is the gap?

LtNoogie · 10-31-2009, 12:56 PM

What? Replace Iridium plugs every year or sooner? If I'd known that owning a S/C was this expensive, I... just kidding.

Thanks for all the suggestions. It's running great with a new set of Iridiums.

Not to save money, but I'm going to Harbor Freight to get one of those spark plug blasters. I've always wanted to see how well they work.

LtNoogie · 10-31-2009, 12:57 PM

Quote:

Originally Posted by camelll

Noogie that would be from octane booster or fuel additives. My plugs looked similar to yours.

Mike, what kind of gas do you use. With enough data points we can show what brands of gasoline leave what kinds of deposits. I've been using Shell V-Power exclusively. I put in one can of octane booster every other month on race day.

yaris-me · 11-01-2009, 01:12 AM

Quote:

Originally Posted by LtNoogie

Not to save money, but I'm going to Harbor Freight to get one of those spark plug blasters. I've always wanted to see how well they work.

If I'm not mistaken you'll also need an air compressor. If you buy an air compressor, buy one with enough capacity to run air tools, like paint gun, impact wrenches, etc... Then I'll come over and work on my car.

cdydjded · 11-01-2009, 10:20 AM

Red to purple deposits on one side of the core nose are an indication of a fuel additive. While many of these deposits are non-conductive and do not contribute to lack of performance, some fuel additives contain octane boosters that leave conductive deposits on the core nose. Care should be taken to select fuel additives which are compatible with ignition systems and do not contain conductive materials such as octane boosters.

LtNoogie · 11-01-2009, 01:40 PM

Quote:

Originally Posted by yaris-me

If I'm not mistaken you'll also need an air compressor. If you buy an air compressor, buy one with enough capacity to run air tools, like paint gun, impact wrenches, etc... Then I'll come over and work on my car.

I have such an air compressor. Let's plan a weekend to work on your car.

yaris-me · 11-01-2009, 10:57 PM

Quote:

Originally Posted by LtNoogie

I have such an air compressor. Let's plan a weekend to work on your car.

Just Joking. I only need to do electrical work right now.

cali yaris · 11-01-2009, 11:47 PM

Race day? Did someone say race day?

N3misiS · 11-02-2009, 04:44 AM

Interesting, I just Turbo'd my car, there is a post...
It is good to know as I am also runing NGK Heat range 7 but the spark plugs are for the
1krfe 3cyl....

As far as I know fuel aditives is a no no, the cr*p they put in there is unbelivable sometimes, here is South africae we are quite lucky we can choose 93, 95, and 102.6 octain fuel for race day....

Have a look at my post, I found some stuff maybe worth mentioning.

10-30-2009, 07:56 PM	#1
LtNoogie View User's Garage Drives: '08 Bayou Blue LB AT Join Date: Oct 2008 Location: West Hills, CA Posts: 2,517	Multiple cylinder misfire under boost Several months ago at an autox event, while under boost the Yaris posted a CEL and went into limp mode in the middle of the race. The codes showed misfires on multiple cylinders. Fortunately, the CEL cleared and the car ran fine if I stayed out of boost. When I pulled the spark plugs, they were all coated with a dry reddish deposit. Today I put in a fresh set and the car runs as well as it did right after the blower was installed. The SC typically puts out 7lbs of boost. I use Shell V-Power gas at 91 octane. What causes this type of deposit? The plugs are NGK BKR7EIX Iridium with a heat range of 7. The plugs have been in since December of last year. I'm also running a set of 1ZZ injectors. AFR stays at 14.7 under normal driving conditions and then goes to 11-12 under boost. __________________ 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

10-30-2009, 09:20 PM	#3
LtNoogie View User's Garage Drives: '08 Bayou Blue LB AT Join Date: Oct 2008 Location: West Hills, CA Posts: 2,517	Maybe I'll try someone else's 91 octane for a year and keep checking the plugs. __________________ 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

10-30-2009, 10:07 PM	#4
thebarber daily driver View User's Garage Drives: the #wrecho Join Date: Jun 2006 Location: Grand Rapids, MI Posts: 5,876	isn't 14.7 a bit lean? __________________

10-31-2009, 01:14 AM	#6
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	Ten months on a boosted car is pretty long for plugs. I would check them more often. What is the gap? __________________ 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.

10-31-2009, 12:56 PM	#7
LtNoogie View User's Garage Drives: '08 Bayou Blue LB AT Join Date: Oct 2008 Location: West Hills, CA Posts: 2,517	What? Replace Iridium plugs every year or sooner? If I'd known that owning a S/C was this expensive, I... just kidding. Thanks for all the suggestions. It's running great with a new set of Iridiums. Not to save money, but I'm going to Harbor Freight to get one of those spark plug blasters. I've always wanted to see how well they work. __________________ 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

10-30-2009, 09:17 PM	#2
scape View User's Garage Drives: 2007 Yaris Hatchback Join Date: Jul 2007 Location: Beaufort, South Carolina Posts: 388	fuel with additives

10-30-2009, 11:47 PM	#5
yaris-me Learn to Relax Drives: 2007, Meteorite, LB Join Date: Dec 2008 Location: Anaheim, CA Posts: 2,070	It looks slightly rich, which is because of the 11-12 AFR. The deposits probably cause the misfire and replacing the plugs is the best thing to do. Probably best to replace plugs on a regular basis.

11-01-2009, 10:20 AM	#10
cdydjded Drives: Yaris LB Turbo Join Date: Aug 2006 Location: Miami FL Posts: 782	Red to purple deposits on one side of the core nose are an indication of a fuel additive. While many of these deposits are non-conductive and do not contribute to lack of performance, some fuel additives contain octane boosters that leave conductive deposits on the core nose. Care should be taken to select fuel additives which are compatible with ignition systems and do not contain conductive materials such as octane boosters.

11-01-2009, 11:47 PM	#13
cali yaris ULTIMATE View User's Garage Drives: 07 Yaris Turbo Join Date: May 2007 Location: Canoga Park, CA Posts: 14,859	Race day? Did someone say race day? __________________ 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.

11-02-2009, 04:44 AM	#14
N3misiS View User's Garage Drives: Yaris T1 1KRFE Join Date: Dec 2008 Location: South Africa Posts: 90	Interesting, I just Turbo'd my car, there is a post... It is good to know as I am also runing NGK Heat range 7 but the spark plugs are for the 1krfe 3cyl.... As far as I know fuel aditives is a no no, the cr*p they put in there is unbelivable sometimes, here is South africae we are quite lucky we can choose 93, 95, and 102.6 octain fuel for race day.... Have a look at my post, I found some stuff maybe worth mentioning. __________________ --------------------------------------------------- “Do or do not... there is no try.”

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