buzb026

iTrader: (1)

my car has stock tune and now has longtubes ORY and catback. put some ported 243's on and i am getting a misfire in cylinder 5. could all this air flowing through on stock tune cause a misfire?

krissoto

iTrader: (3)

only if it might have fouled the plug. Change the plug and chk your connections on your coil packs and wires .

Burken01

iTrader: (88)

this ^^^, my car was misfiring and my check engine light was on.

I plugged my diagnostic obd2 scanner in, and i had cylinder 8 out..

just replaced the sparg plug and it was fixed..

the plug might of got damaged during the swap or if you reused them it might of fouled out..

Burken01

iTrader: (88)

and check your spark plug wires, make sure you hear them click when you press them on... grip the boot of the plug wires when applying pressure, if you dont then sometimes it wont click in, even though it still looks connected.

squirlNUTZ

I had a miss fire code after my engine swap. Turned out to be two things: I has damaged the map sensor pig tail, and the intake rocker arm on number 4 had come off and was laying there next to the pedestal

djfury05

iTrader: (30)

check the grounds on the back of the heads also

TransAmcoupe98

iTrader: (10)

Check your coils

buzb026

iTrader: (1)

turns out one of the injector connectors had come loose. thanks for all the insight.

mannyman84

iTrader: (2)

So sime yet hard to find if you don't do the basic inspection. Good job OP