H22A4 Problem

[Vistec R]

Car: 96 Civic Hatch

Engine: Bone Stock H22A4

Code: p0304 ( Missfire Cylinder 4

Idle Air control Code


Problem:

Car started out of no where to Rev up and down between 1,000 -2,000 and when the car is driven it runs fine.

Sunday I took the car to the track and the car started to have a missfire code P0304 but onces runing the car feel fine but idle you feel a light vibration.


Check:

-All vacumm hose nothing loose or crack or broken
-Clean Air idle control (wasnt dirty at all but clean it anyways)
-replace all spark plugs



Found: So Here is what I found onces I pull out the wire for cylinder number four the car idles fine and the missfire goes away! there is spark coming out the wire has a new spark plug. But if i put it back it goes back rough idle and the miss fire.



HELP ! any ideas !

[Accordboy97]

It still happenes with the new wire?

[Vistec R]

It still happenes with the new wire?

Ok so I did complete MSD setup wires, cap and rotor, NGK plugs and nothing car till had a miss fire cylinder 4 and idle up and down..

clean both the IAC and the FITV and nothing same thing...

re check all the hose to see if any would make a differences

I notice that onces i disconected the IAC it stop idleing up and down but would have a horrible miss fire.

[Accordboy97]

I would just replace the IAC completely and recheck the msd setup i dnt really care fo msd i think it makes the car run like shit. A few of my boys had it and took it out.

[Vistec R]

yeah im have to do that but the hard part for me is finding some one willing to let me barrow there IAC lol..

the msd just the wires and the cap and roto stock coil.

[y8beast]

I'll sell u one for like 20 dollars lmk if u want it I got some otha shit if u need it whole motor to be exact

[Vistec R]

I'll sell u one for like 20 dollars lmk if u want it I got some otha shit if u need it whole motor to be exact

pm sent

[Vistec R]

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UPDATE on my problem

So I bought a new, FITV and IAC and didnt fix anything the rough idle was still there...

So i decided to take the Throttle body out and clean it. while inspecting it i found out the TPS sensor screw where not tight so i screw it back and tested it. just to find out the up and down idle went away but now the RPM's wont go down less then 2,000 RPMs and the miss fire still there..

also the ECU started to make this wierd noise like if theres was somehting grinding in there very wierd and in one corner it got really

[Vistec R]

Ok Another update to my problem...

So i replace the MAP, TPS, throttle body, IAC, and FITV....

in the process i found out MAP sensor was missing the O ring.... So onces a new O ring was install the RPM's went back to normal. instead of reving up to 2,000... But the Up and down rpms came back and the miss fire went away... So I install a new gasket on throtle also clean and nothing same thing.. check hoses.. I even check coolant to make sure it was up to pressure and nothing
Damm RPMS are up and down..

I do get a check engine light but with the scanner i cant scan it any more for some reason it wont connect to the ECU... since it still has the OBD 1 plug i can jump it and get a code. The code that comes up is code 7 witch is the TPS... but then out no where it was throwing me a code 23 witch is knock sensor...

damm im confuse... what should i do next?

[Accordboy97]

it might cost you but i think at this point take it to the honda dealer and have them look at both the knock sensor and tps. Maybe they can tell you exactly whats wrong with it. Or even your tuner.

[TypeSHLude]

I can fix it hit me up...