Mazda 2008 MazdaSpeed3 Wartungshandbuch PDF herunterladen (Seite 14)

within the frequency range of engine detonation or knock. The engine may not be detonating, but the DI fuel injector rattle

can cause false knock which disallows the engine from running properly.

If you notice that your ECU is suddenly picking up more Knock Retard (KR) than normal, and you have ruled out all

other common reasons for this (poor quality of fuel from your last fill up, excessive ambient heat, heat soak, rattling heat

shield, etc.), then you may need to remove your DI fuel injectors in order to replace the DI injector seals located within the

head. One good test for false knock is to fill your fuel tank with 2-4 gallons of higher octane unleaded race fuel, around 100

octane will suffice. If the KR is still present, it's likely that your current DI fuel injector seals are failing or have failed. Several

manufacturers offer after market alloy injector seals that are better suited for the higher temperatures and cylinder pressures

realized by higher horsepower MAZDASPEEDs. If you plan on generating more than 350WHP or you notice a sudden

change in your Knock Retard response, you may need to replace the stock DI injector seals. You can simply type “MAZ-

DASPEED injector seals” into your preferred web search engine and several options are available to you.

Service Bulletin Update - Appropriate Spark Plugs

Our data has shown that the factory spark plug temperature range (6) and gap (~.034”) are sufficient for stock boost

levels and normal driving conditions. Although, operating the car with higher than stock boost levels, or with the calibrations

that are loaded on the AccessPORT, require that a 1-step colder temperature spark plug be used with a gap of .026” - .028”

(6.6 – 7.1mm). Denso currently offers this spark plug as part # ITV22 (please be sure to verify each plug is properly gaped

before installing them). Our experience has shown that operating your turbo-charged engine at higher than stock boost levels

requires that your spark plugs be replaced at around 12,000-15,000 mile intervals.

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Mazda 2008 MazdaSpeed3 Wartungshandbuch Seite 14