h22a breaking up and missing

[rossisalvage]

My h22 is breaking up from roughly 700-1100 rpms 1800-2100 rpms and 3500-4000 rpms. This is only once it warms up to regular temp, for the first 15 min of driving it runs fine. It is also idling really low and missing while it idles. It seems that after 4000 rpms everything is fine, and the motor pulls really hard. Its tuned on a p28 hondata s100. Recently I replaced the bends on my downpipe and welded it closer to the oil pan so i would stop crushing them. When the car was tuned, the downpipes were crushed. I dont know if the new downpipe messed with the tune and thats why its breaking up? Or does it seem like an ignition problem?Thanks in advance for the help, its much needed.

[rossisalvage]

anyone?

[Smiley_cb7]

I don't think the downpipe would have anything to do with it. You say it was dented or crushed? Being crushed would put a kink in it. Somehow tuning with it like that wouldn't make any sense. As far as problems what kind of ignition wires are you running? Sound like the ballpark area I would check first. Distributor, spark plugs

[bruno8747]

What do you mean breaking up? As in sputtering or mis firing?

Could be your tune, or it could be the ignition coil.

[rossisalvage]

I don't think the downpipe would have anything to do with it. You say it was dented or crushed? Being crushed would put a kink in it. Somehow tuning with it like that wouldn't make any sense. As far as problems what kind of ignition wires are you running? Sound like the ballpark area I would check first. Distributor, spark plugs

The downpipe was alittle dented at the bottom bends when I had the motor tuned. It probally restricted flow alittle. I put the new downpipe on, ran the car all night pretty hard and it ran fine. Then I got my wisdom teeth out so the car sat for a week. The day I started it up it had the problem. Ngk plugs and wires, about 8 thousand miles on them. I am gonna pull the plugs tommorrow and see how they look.

What do you mean breaking up? As in sputtering or mis firing?

Could be your tune, or it could be the ignition coil.

Sounds like mis firing. It has no power when it does it and sounds as if the motors about to blow. Is there any way to check the coil?

[bruno8747]

Check the resistance of the coil. And possibly replace. But does this only happen at a certain RPM?

[rossisalvage]

Check the resistance of the coil. And possibly replace. But does this only happen at a certain RPM?

Allright. Yes only from 700-1100 rpms 1800-2100 rpms and 3500-4000 rpms when the motor is under a load.

[rossisalvage]

I put on my buddys distributor today thinking it was the problem and it still missed. Checked the cap, rotor, plugs, wires, everything looks fine. what now?

[H22Artman]

sounds maybe like a fuel delivery problem. or maybe a tps issue.

check your fuel pressure.

[Ghetto_CB7]

do you still have the p13?

If you still have the p13 plug it in and see if it runs correctly.

If that is not possible/not the problem then see if can at least check for CEL's

After that it sounds like and ignition error like previously stated.

If it was just the lower rpm range then I would suggest cleaning/replacing the IACV but that almost always throws a code...

My suggestion would be to not drive it if possible until you get if figured out

In neutral does it rev "normally" or does it bog when you get on it... If It bogs then I would agree your tps is off

[rossisalvage]

If you still have the p13 plug it in and see if it runs correctly.

If that is not possible/not the problem then see if can at least check for CEL's

After that it sounds like and ignition error like previously stated.

If it was just the lower rpm range then I would suggest cleaning/replacing the IACV but that almost always throws a code...

My suggestion would be to not drive it if possible until you get if figured out

In neutral does it rev "normally" or does it bog when you get on it... If It bogs then I would agree your tps is off

I dont have the p13 anymore. This wensday I am taking the car into the shop where it was tuned. There are no cells, I cleaned the TPS and IACV and the problem is still there. In neutral it dosent bog at all. I think its a tuning problem or fuel delievery.

[DRQPQUT]

check your gap on your plugs slam them to 0.20 sounds like your having ign. problems im kinda going thru the same thing slammed the gap cured the problem

[Ghetto_CB7]

Tps

It might be a little late to state this, sorry I have been busy,

The tps probably wasn't dirty...

First of all for those who do not know what a tps actually is. (and no I don't mean the acronym for throttle positioning sensor...)

A tps is something called a potentiometer which is a fancy name for a variable resister. Essentially as you press on the gas pedal it opens the throttle body butterfly which is attached to the tps.

As the internal part of the tps moves it changes the resistance and thus changes the voltage it sends to the ecu.

The correct voltages should be about .4-.6 Volts at idon (not pressing on the gas)

and about 4.6 V at WOT (wide open throttle)

I am sure there is a thread on this somewhere... If you have more questions please ask or search for the information most likely previously posted