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You can get more out of the car by side gaping the plugs. ( http://performanceunlimited.com/documents/plugsidegapping.html ) ( http://www.angelfire.com/me4/dugbugwap/images/SplugMod.JPG ) I have used these in a 03 Protege DX. I used ZFR6F-11 like that & the BKR6EK types but the BKR6E-11 are...

Is your VTCS, "Variable Tumble Control System." etc working right? The one close to the injectors should shut on a cold engine then open when warm. The other valve when the engine is warm should open at higher rpms. If they both do something, move then they work good on your car. You might...

You might have a leak on that little secret valve under your intake manifold. The rubber tube might be dry, cracked, leaking? Photo here. ( http://www.toprotege.com/forums/showthread.php?t=42321 )

I think it in a knock sensor on the engine block on the back of the engine. Im not sure about it!

To pass emissions, on a empty tank fill it up with 2 or 3 gal of 100 octane, just for the test. That will solve the lean code at idle. Did you mod the VTCS etc to be wide open. I have mine screwed, locked open. It makes idle bad & that is a lean issue at idle sometimes. Each car acts...

Is all cats gone. You can't leave one, the one cat will have to do the work of 2 & will burnout faster. It's all or nothing. The ECU doesin't know the cats are gone, so it reads things as being too rich. So it turns down the fuel. So you need to turn up the octane. Less of 91 octane = about 87...

NGK BKR6EK are the same hight as NGK ZFR6F-11, but the center electrode on the BKR6EK is where the side electrode is at on the ZFR6F-11. So the combustion is further in the cylinder than the ZFR6F-11. Those plugs alone advance your timing being deeper in the cylinder. BOSCH F8DC4 are...

I have used many spark plugs in my 03 Mazda Protege DX. I was wondering how they worked for you. Out of all of the bunch I came up with the best as in. NGK BKR6EK ( Needs better octane 89 - 91 ) NGK ZFR6F-11 ( Needs better octane 89 - 91 ) BOSCH F8DC4 ( NON-Resistor Needs better octane 91+ )...

I know if it is P0301 = Cyl. No.1 misfire. That is bad! With me it was the crank shaft / bearing loose! I was driving on the highway when I heard a clank, clank... It just got worse! I had a warranty good because it was the crank shaft being loose. If it was Cyl. No.1 yes that might be the...