Ok here is my set up. Got a 95 civic ex with a b16. B16 was originally obdo and I converted it to obd1. I have not had the engine tuned yet and I don't know if that would cause the surging. I have the old ecu p28 running the motor.

It first started running cold idle fine. Now it does this all the time. It starts fluctuating from 800 to 1500. When you are accelerating past a 1/4 throttle its fine. If you try to go slow or when you cruise it seams to hesitant. Like you take your foot off and on the pedal. There are no codes coming up... I have disconnected the plug on the back of the intake and the idle went up and was steady. I also have a nipple on the bottom of the tb that someone before me had capped and had a block off plate. I changed it out with a d series. Is this fine?

 

did you search?

there are thousands of articles about this, my guess is FITV

 

Yes I did search in tech, in hybrid in, all motor anything else ***. If YOU dont want to help then dont read !!!! Was wanting real help.

 

sounds like you already nailed the problem, when you unplug the IACV, the problem goes away, sounds like it is either wired wrong or broken. does it have a coolant line going to it or was that blocked off? i'm not sure what you were talking about being blocked off.

 

On the bottom of the tb they made a "plate" out of aluminum stock. I put the other one on and not sure if I have them on backwards. Is there a in and out? The nipple coming out of the head I have running to the top of the valve. And the bottom one I have running to the thermostat housing. Is this right or do I have it on backwards? Why do people bypass this, more hp?

Would a none tuned ecu cause this?


Modified by 95civicB16 at 1:32 PM 8/30/2007

 

Would a none tuned ecu cause this?

 

it could but i doubt it. usually if the ecu is jacked, it will just be low or high or lumpy, not fluctuating. unless the ecu is not properly controlling the iacv.