[feke_marc]

So my problem started with a surging idle. I replaced the iacv and the problem went away for a few days but came back. Had a friend change the tb, sensors on it, map sensor, and iacv. Now it sometimes surges when cold, but usually does when in neutral and the car is coasting. When it warms up the idle stays around 2k rpm’s and kind of sputters/bounces. Driving in like 1st-4th gears at low rpm’s it is rough when letting of the gas like in the 1.5-3.5k rpm range when letting off the gas it’ll jolt or buck kind of hard. If anyone could help I would really appreciate it.

Rsx high idle problem pls help me

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[MoHo]

So my problem started with a surging idle. I replaced the iacv and the problem went away for a few days but came back. Had a friend change the tb, sensors on it, map sensor, and iacv. Now it sometimes surges when cold, but usually does when in neutral and the car is coasting. When it warms up the idle stays around 2k rpm’s and kind of sputters/bounces. Driving in like 1st-4th gears at low rpm’s it is rough when letting of the gas like in the 1.5-3.5k rpm range when letting off the gas it’ll jolt or buck kind of hard. If anyone could help I would really appreciate it.

Rsx high idle problem pls help me

youtube.com

After replacing all that, did you do a hard reset on the computer? Remove the cables from the battery and hold them together for 30 seconds ( or more). The car will still run rough as the comp re-learns. Then might get better.

 

[Perfectionist]

We've all done it, gone down the parts replacement rabbit hole without actually diagnosing the problem first. Too many new variables have been introduced to the problem now.

The initial surge problem, and now your high idle, is the result of too much air entering the intake. Causes can include vacuum leak, faulty fast idle valve, low coolant, restriction or defect preventing the throttle plate from closing completely, idle air control valve sticking, etc.

Here's a video diagnosing idle problems on an older model, but the principles are the same.

 

[feke_marc]

After replacing all that, did you do a hard reset on the computer? Remove the cables from the battery and hold them together for 30 seconds ( or more). The car will still run rough as the comp re-learns. Then might get better.

Yeah, it slowly goes back up to 2k rpm

 

[Perfectionist]

Your money light is on, Did you scan for codes?

 

[feke_marc]

Your money light is on, Did you scan for codes?

Lol yeah these were the original codes showing before I changed anything. One of the 02 ones is from when I installed the skunk2 alpha headers.

 

[MoHo]

Lol yeah these were the original codes showing before I changed anything. One of the 02 ones is from when I installed the skunk2 alpha headers. View attachment 571625

Lol yeah these were the original codes showing before I changed anything. One of the 02 ones is from when I installed the skunk2 alpha headers. View attachment 571625

I concur on the money light perfectionist LOL. You sure he don't need to go back and adjust the valves. I'm just messing with you, this is an extream case of IDK? But that could be a classic example of a brand new bad o2 or two, or the big ass header he put on it? Then again. when you lose the rabbit and it happened to all of us. A perfect tune, jusssst one more little tweak. Lost It! Go back to where you started when everything went wrong.