Okay this is on a 94 b16a del sol.. we just put on a new intake manifold and when we start it up it start reving from 1000-2200 then back to 1000-2200 again and again.. can someone help us out why is it doing that?? thank

 

somewaht experiancing the same problem too bump for help

 

I had this too, right after a new timing belt on a D16Z6 - I thought I must've been off by a couple teeth. It fixed itself though. Couple months later I sold to my brother...I haven't seen the car personally, but he says the idle is loping again occasionally. I don't know why.

Bump for info.

 

https://honda-tech.com/zerothread?id=558236

i got that from https://honda-tech.com/zero...age=1

 

check you vacuum lines on the intake manifold and the iac.

 

vacuum leak

 

just drive around with it for 10min or so

it iwll go away after a while


its the ecu learning the new air ocming in from the intake

this was happening to me on my cx with a j intake
it will bounce everytime my ecu gets rested

 

i think its time to adjust the valves
the last time this was happening to me i blew my old motor because i didnt get it done

 

happened on my old prelude, boucing idle. bad vacuum line, check em. Pulled one off the intake, solved the problem for good

 

check your coolant levels

 

actually it sounds more like your FITV, IACV or a Vac leak. If it does it on a cold start, its your FITV. But if you dont have one, then its your IACV or it could be a Vac leak. The FITV and IACV is what controls the idle at startup. So therefore it must be one of them. But check your FITV first bcuz the FITV is what controls the idle at cold start and when its warm, it switches it off to the IACV to control it. Just clean them up with carb cleaner. If cleaning them doesnt do it, they could be broken and you'll need to buy another one.

 

the problem with mines is that you could actually hear the valves knockking and its been gettin worse