Y_U_no_run_evo

Soo my evo is messing up real bad and I have taken it to my tuner and he just charged me 300 for plugs and 1 coil. my coil completely separated from the housing but now with the new ones my evo will run fine and then out of the blue it will start sputtering and when it is doing that it won't let me hit any power.
but if I drive like a grandma I can hit boost and with slow accel I can get to any speed.
but now I checked the plugs and cylinder 4 has 50 psi and will when I drive out of the blue it will loose power like I turned the car off and then it goes again like a hiccup
mods are just new piping with filters by in jen
could it be the bov

Slow_Supra

So you did a compression test and only had 50psi in cylinder 4?

Bhsj13

i was going to say MAF until i saw the 50psi.

Ev0ikon

iTrader: (18)

Your thread is so hard to understand.
Did you say the compression on cyl 4 only come up to 50 PSI?

Y_U_no_run_evo

yeah only 50 in that cylinder the rest have 135

Biggiesacks

hate to break it to yah, but your engine is probably going to need a rebuild. That compression is either caused by bad rings or bad valve sealing. You can try adding a little engine oil into the cylinder and if the compression improves its bad rings, if not bad valve sealing.

Biggiesacks

Y_U_no_run_evo

would this explain y it is jerk ingredients so hard?

Biggiesacks

I would expect it to run pretty bad with that much of a compression loss.

Y_U_no_run_evo

would it be wise to just replace engine or to do a rebuild?

Biggiesacks

Thats really upto you. Do a bunch of research, find out what the cost of a crate motor is vs. what a rebuild would cost. Most people take this situation as an opportunity to rebuild the engine with upgraded parts to allow for more performance. The reliability of an upgraded engine is very dependent on the competence of the machine shop doing the build. A crate motor is going to be completely new parts, sensors everything, will have the same reliability of a new stock engine. So compare the costs, gauge the competence of the shop you would have do the build and decide from there what works with your budget and goals.

Ev0ikon

iTrader: (18)

It depends on how badly damaged the engine really is. You may luck out and it's just a head gasket or a bent valve.

Biggiesacks

This is very true, figure out what exactly is wrong before assuming the worst.

Y_U_no_run_evo

thank you guys I'll keep u updated on what's up with it but while we were talking I pulled my plugs and on cylinder 4 the negative was touching the tip... and looked like it was beat with a hammer

Ev0ikon

iTrader: (18)

Ouch.
Is the timing belt still on point?