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.

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

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