Hesitation/ buckking when accelerating helpppp :(

[Maple50175]

I have lost it. Seriously. I'm pissed I have been trying to fix this for days and gave up. Here is the deal.

Turboed civic has been running fine for 40K miles. Up until 2 weeks ago i got a problem where when i gas it it like bucks/hesitates then goes. If i really get on it and keep doing it it will start to misfire and throw a code for misfiring.


So far I have replace:

New Walbro 255lph fuel pump
New Spark Plugs
Injectors read out fine with ohmeter
Tryed to seafoam, didn't fix problem

etc.
I have perfect compression. 180 on all 4cyn.

So what the hell could it be? Ugh this sucks. I just ordered a civic SI ecu for my KPRO and I need this BS fixed.

[Ralphie]

Mine use to do that when i had oil leak into the spark plug channels.

[Maple50175]

ttt

[evil_demon_01]

Could be a tuning issue, have you had any recent changes to the map?

Check the timing, I've experienced 2 K20's that have had the Chain jump a tooth.
Also, Moreso common on the K24 CRV but could also be the VTC actuator seized.

As for basics - the bucking/hesitation/misfiring - all can point to a faulty coil pack.
When you get a code for misfire, is it always the same cylinder that codes?

[Maple50175]

It's misfiring accross all the clyn.

it's not a tuning issue. car has been fine, for 40K miles.


ughh

[evil_demon_01]

Did you fit a new filter when you fitted the pump?
Could also be the intank Fuel pressure reg.

Get a gauge and check your fuel pressure when its faulting.

[Maple50175]

Did you fit a new filter when you fitted the pump?
Could also be the intank Fuel pressure reg.

Get a gauge and check your fuel pressure when its faulting.

yeah i thought the same thing fuel pressure regulator, thing is i can only get a used one from junkyard. I'll prob try that out tomm.