MissFire Codes ! Changed Plugs All, Replaced 2&6 Coilpacks And Wires
Fault 302 Keeps Coming Back, Swaped Coils Around Still #2 Ugly Head Still There. Have The iscan Can Watch The Misfires ! Checked Ref. Sensor Lead, Good. 72k on Engine. I May Swap #1 and #2 Injector Next, Any Help Would Be Great ! Do I Need To Reinitialize System And How ?

Help Loosing My Mind !!

Thanks Arnie.

 

Swaped Injectors 1&2 No change. Seems Worse !
1 misfire a Sec. Above Idle 2000rpm
Engine Runs Smooth Cant Tell In Shop, On Road (load) Will Kick Off Cyl. Within 5 sec At Accel. Must Restart To Return To Shop And Drive Very Light.Is Compression Test Next?? What Should It Be!No Acsses To Leakdown Test. HELP!!!!
Thanks Arnie

 

Disconnect MAF sensor and drive vehicle to see if misfire goes away... might take a few attempts to start engine with Maf disconnected but it will start... if misfire goes away suspect MAf sensor/circuit...

 

I would replace the crank position sensor. I had the same problem with my ML320, changed plugs, coils, wires and injectors all with new but could not go above 4000 RPM without triggering multiple misfire. I was then blaiming exhaust back pressure (bad cat. convertor) on one side (left cylinder bank #2&4) because of the high millage 160K and MAF sensor was clean without any codes about it. Now is fine and the fault is not comming up even at hard acceleration. Also bad throttle body position sensor can show multiple misfire code ( according to my Star manual).