masstumor

Random misfire cylinder 1 and 4
Stock 08 Scion TC

Items replaced:
MAF censor
Spark plugs (NKG)
Coil packs (all 4)
Wiring harness to coil packs (due to broken clips)
Air filter
Gas cap
Pcv hose
Fuel injectors (all 4)

Compression test cold:
Cyl 1 - 120psi
Cyl 2 - 100psi
Cyl 3 - 70psi
Cyl 4 - 0psi

Compression Test engine at temp:
Cyl 1 - 160psi
Cyl 2 - 150psi
Cyl 3 - 150psi
Cyl 4 - 150psi

Compression Test wet at temp:
Cyl 1 - 180psi
Cyl 2 - 170psi
Cyl 3 - 170psi
Cyl 4 - 170psi

When the engine is cold it misfires heavy, the car shakes like no other the check engine light will flash. When it warms up it'll run fine still misses but not bad and is barely noticeable. Sometimes even after letting the engine warm up, like say at work I crank it up let it warm up to temp and leave when I get to a stop sign and come to a complete stop then go it'll lose power all together, The car will sputter, the check engine light will flash, its slow to speed like barely goes 20mph and the rpms are high. After about 10 or 15 seconds it stops and drive like normal.

A few times I would be leaving for work and it wouldn't wanna go at all. I would be giving it gas and it would creep like 5mph. When its cold outside it takes 5 or so minutes of cranking just to get it to start, This is in FL. we barely get below 50 here. I'm at a loss and already put to much into this car already. Does anyone have any other ideas on whats causing this misfire. I swapped the coil packs around 4 to 3 1 to 2 and still misfire on 1 and 4.

xile6

Your compression numbers are way off.
you have a bad cylinder. Thats why you habe a miss fire. Mostly the rings are gone

masstumor

Yea we pulled the motor suspecting a blown head gasket, was in the middle of cleaning it when my buddy pulled the dipstick and said it smelled like straight gas. Sure enough the rings were fried on 3 and 4.