Averying's 2009 Platinum Graphite 370z Journal

Averying

My hunt to find the culprit of the misfire continues. My theory: it MUST be the injectors right? Can’t be spark plugs.. can’t be the coils… See full write up below:

Things I tried:
-Cleaned the throttle bodies
-Recleaned the MAFs
-Cleaned the injectors with the method of hooking up a can of carb cleaner, connecting to a battery and firing away. A couple of them seemed to spray a bit rough on first try but it instantly became a uniform spray. I also backsprayed them during the cleaning process. Also installed new O-rings.
-new spark plugs
- put in 3 gallons of fresh 93 and a bottle of Techron fuel system cleaner. The tank was almost empty so this is a pretty strong dose of Techron.

Now I’m getting most misfires on cylinder #4 and a couple misfires on cylinders #3 and #5 as well. When I reinstalled the injectors and coils, I didn’t put them back in the cylinder they came from. I reinstalled them randomly. That’s a mistake on my part.

So once I saw it was misfiring on cylinder 4, I swapped the coils between #4 and #2 (#2 had no misfires). The results didn’t change at all.


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2009 Sport Touring | Platinum Graphite | GTM Stage 1 Supercharger | BC BR Coilovers | Hotchkis Swaybar | Z1 FUCAs | AME TM-02 Wheels | Z1 2-piece Front Rotors | Z1 Clutch & Flywheel | Invidia Gemini Catback | GTM Resonated Test Pipes