H22 bogs and loses power

[93accordexcoupe]

Alright guys riddle me this one.

Motor: h22a
Tranny: m2b4
Mods: Short ram intake, blacktrax spacer, hondata intake manifold gasket, Tri-y slip fit header, high flow cat, DC cat back.

The issue:

Car starts up fine but doesnt have the high idle with the slow drop that it used to. It fires up and revs to about 2k and drops instantly to about 300 and almost stalls. Then goes to about 1000 and hangs out around 750 when it calms down.

When I drive off easy on the throttle it seems to almost get stuck somewhere just under 2k rpms and I have to get on the gas more to get it "un stuck". I notice this through out every gear when I'm just cruising.

If I get on it hard sometimes to power is just gone. It will accelerate but it feels like Ive got 100 hp max.

Sometimes its fast as hell and it will scream all the way into VTEC and then around 6400 it feels like it gives up and the power is gone.

I know thats kind of a lot to take in but thats the best way to describe it. Any ideas?

Clutch and flywheel are all new so I dont think its slipping out of gear, it doesnt feel like that anyway.

I should add that I unplugged the O2 and drove around and it doesnt bog at low rpms but still falls on its ass up in VTEC. Could air be getting in or out of the slip fit and cause this, hence the reason it ran different with the o2 unplugged?

[4GAccordH22]

What ECU are you using?

[93accordexcoupe]

p13

[Losiracer2]

ignition timing is spot on?

[93accordexcoupe]

I'll check it but i dont see why it would be off to begin with

[tutsuo]

ignition timing is spot on?

Check your dizzy(distributor)id spead it up a bit for fun, spark plugs and spark plug wires.



A buddy of mine had the same issue, after hours of argeous searching we found it was a broken spark plug wire internal. As we were pulling the wires a peice of the inside stayed on the spark plug LOL.

[AeyJayCB7]

Plug the o2 sensor back on and see if the boogs stops. Mine bogged but I just bought another o2 sensor "NTK" and the problem stopped. Hey I even got a good boost of MPG's Check the idle screw and mess with it... Those are the only two options that come into mind.

[93accordexcoupe]

Check your dizzy(distributor)id spead it up a bit for fun, spark plugs and spark plug wires.

Dizzy hasnt moved. I dont want to make it "fun". Its already fun, when it runs right.

Ill try plugs and wires but I dont think thats the issue

[93accordexcoupe]

Plug the o2 sensor back on and see if the boogs stops. Mine bogged but I just bought another o2 sensor "NTK" and the problem stopped. Hey I even got a good boost of MPG's Check the idle screw and mess with it... Those are the only two options that come into mind.

With the o2 sensor plugged in it bogs. Plugging it back in is not going to magically make the issue disappear.

Idle screw? I doubt that has anything to do with it. It idles fine after a few seconds.

[Julio@Bisimoto]

Just to be on the safe side double check ignition timing to be dead on as well condition of fuel filter and distributor rotor/cap/coil/ignitor. It is possible to have a faulty O2 sensor and or reading if you are getting fresh air through the slip joints are leaking.

[bruno8747]

do you have a spare ecu to test?

P13 have been known to go bad so dont rule that out.

Next would be a bad ignition coil
TPS sensor
Map sensor

[h22sparkle]

Any check engine lights? Your o2 sensor tends to mess with the fuel too and timing but make sure you check your vacuum leaks and distributor to make sure that the orange soot isnt in the distributor cap because when that does happen its probably on the way out.

[deevergote]

With the o2 sensor plugged in, it loses power because the sensor is failing. It doesn't always throw a code. Plug the o2 sensor in, and take it to about 55mph... I guarantee it will throw a code 43.

When you unplug the o2 sensor, it runs fine until it should cross over to VTEC... then it falls on its ass. Why? Because with no o2 sensor plugged in, the ECU is in limp mode. No VTEC.

Replace that o2 sensor with a new Denso or NTK/NGK unit, and it should work just fine.

[h22sparkle]

With the o2 sensor plugged in, it loses power because the sensor is failing. It doesn't always throw a code. Plug the o2 sensor in, and take it to about 55mph... I guarantee it will throw a code 43.

When you unplug the o2 sensor, it runs fine until it should cross over to VTEC... then it falls on its ass. Why? Because with no o2 sensor plugged in, the ECU is in limp mode. No VTEC.

Replace that o2 sensor with a new Denso or NTK/NGK unit, and it should work just fine.

Be lucky that you dont have to get a o2 sensor from the dealer. Most turbo cars like the SRT4's and evo's are very picky when it comes down to that and if it's generic instead of OEM you can just forget it so count yourself lucky.

[deevergote]

Denso and NGK/NTK ARE OEM.
Fortunately for us, places like RockAuto sell Denso for like $35.


old cars FTW.