1jz random missfires

[mk3concepts]

so like the tille says..random missfires..which causes alot of smoking..through the exhuast and from engine bay..sounds like a lawn mower..or like the engine blew..or a wrx...

i already got my ecu re-capped.........this happens mostly in the morning...and its not often

any idea what it could be?

also the i can smell gas that is not being burned

 

[mkiiichip]

cracks in coil packs? under the boot

 

[mk3concepts]

hmmm you think so? i havent checked that yet..i check my igniter and ecu with my friends..ill try coilpacks

 

[mk3concepts]

ok i just checked the coilpacks..and i checked if it sparks or not..they all spark...right where the rubber boots is..but it doest spark where the it ends where the whole is..the spark starts right where the boot starts..is that supposed to happen?

 

[Freshmaker]

I don't completely understand where your describing, but the only place you should get spark is out of the spark plug.

You checked them with a spark plug in them right?

 

[mkiiichip]

Have you looked under the boot yet to look for cracks?

Just the fact that the spark is ABLE to spark out the side of the coil pack is an issue. While yes there is usually a spark plug there, you have proven that the spark is able to ground itself out without going to the cyl, creating a misfire.

Members here have come up with several ways to MacGyver cracked coil packs. just search.

 

[gtepowerplant]

About a month ago a similar thing happened to me, the car would start missing and sounded exactly like a WRX.

We looked at the plugs, coil packs, harness, ECU, everything. Just tinkering under the hood out of frustration after a few hours and found the #5 injector clip was loose and that is what was causing the WRX sound.

Hopefully you will be as lucky.

 

[mk3concepts]

well right now its the ecu..the wrx sound went away after i used my friends ecu..and it came back when i put mine back in..so i need an ecu!