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Discussion Starter · #1 ·
Friend just finished building the motor. it runs but now has a really nasty misfire.

right click and save as to view video
http://jdmlyfestyle.temp.powwe...1.wmv
Mods are
G60
1.9 litre bbm pistons
268/260 cam bbm
bbm stage 4 kit 15psi pulley
rebuild bbm g60 supercharger
BBm plug wires
w6dpo plugs
ported head with 7mm stem valves
new cap
new rotor
new fuel filter

those are the following mods and were only getting 10psi of boost. idles like ****. any time we get boost it just falls on it face. if you drive partial throttle its ok to drive. Hold RPM's steady in neutral there is a mis fire.
Also when car is started in the morning on a cold start. oil pressure is good at 35-40 psi. but when car warms up oil pressure drops to 10-20 psi but when cruising oil pressure is at 30 psi.
 

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Re: Horrible Misfire on 4cyl G60. (2muchpsi)

you should see 12hg @idle your cam or intermediate(distributor) or both are incorrect.
you did put in new lifters right?
take pics of all 4 plugs and their condition. sounds like butt don't drive it like that please.
 

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Re: (2muchpsi)

plug the blue harness into the black sensor, if drives much better, buy new blue sensor.
sounds like the blue cts or the o2 sensor wiring system is not right.
1. put BLUE CTS harness on black sensor. ride.
2. See if you can tape up the WOT switch (DISABLES O2 system) go ride. if so fix o2 system.
thats a good start.
oh yeah make sure you timed the car correctly . 268/260 cam @6BTDC should be 12hg ~ at warm idle at requested 840+ rpm idle.
 
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