Hi there HMs..

Like the topic says, I have a non-steady idle if you would, that you can see noticeable whenever I step on the gas and try to keep RPM steady. I kind of goes up and down with a variation of about 250 rpm...

Vehicle specs:
00 Honda Civic Si
ecu p06 tuned w/obd2b to obd1 convertion harness
b18c1 block w/ pr3 pistons
b16a2 head stock
b16 tranny
act streetlite flywheel
act 6 pad spring race clutch kit
skunk2 pro manifold port matched to a 68mm tb
skunk2 pro 68 tb
fuel press r
intake, header, exhaust
etc

So far I have checked the following test:
1. Check if IACV is working fine. It seemed clean but cleaned anyway with a degresant solution.
2.Check if there was a buble in the cooling system. I did the bleeding procedure step by step according to the helms manual.

I have NOT performed a compression test nor a leakdown test.

If anyone had experienced anything alike or any suggestion about it, please help

+++ here is a video of my autometer tach just pressing the pedal in a steady way, (see the needle moving and also hear the engine)+++

http://www.youtube.com/watch?v=Ylfk7UP_zlc

 

bad FITV or IAC or vac. leak. could also be a bad tune.

 

Check the air control valve or it cud be aloso a bad sensor

 

I'm about to check for a vacum leak around the intake, using a carb cleaner and see if I find something there...

I'm not so sure the problem lies on the ICAV nor the FITV since my car does not have one. The reason why I'm almost sure is because today I performed the following:

1.Started the engine till reached normal operating temp.
2.Removed the air intake piping leaving the TB exposed
3.Reved the engine just a little (about 2 or 3 K) by opening the throttle by hand
4.Using my other hand I plugged with my finger the air passage that uses the IACV to control the air flow...

The car keep doing the same as you all saw on the video

Any other opinion about my current problem.........

***Remember, the video shows what happens when I gas the engine and try to keep a steady RPM, say for instance, when I'm getting ready to launch on the track. It's NOT like that when the car is a idle***

 

have you tried clocking your TPS or checked you mechanical and ignition timing lately?

 

Mine did the same thing last night...and it was because of a bad knock sensor. Replaced the knock sensor...problem gone.

I had the same problem when my TPS went out...maybe that helps.

Good luck.

 

Well in response to the replys this is what I have so far...

1.Check the TPS and is working fine. I removed the tps and performed the clocking test, I also checked it using an omh meter once I put the sensor back on the throttle body. I have it set to .850omh when at idle. While I was getting a reading using the omh meter I opened the butterfly a little by little and got a reading (increased as I opened)

2.I also replaced the Knock sensor using another one I had and it keep doing the same thing...

Next thing I´m about to do is check the Distribuitor and see if evering is ok