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Modified by 75 Power Wagon 340 at 6:46 PM 12/29/2007

 

What do you me surging? When its cold it should have a fast idle.

 

when its cold... it idles between 1500 and surges up to around 2000, and back down to 1500... when i am coasting to a stop, or sitting somewhere at an idle.. and repeats that until its warm...

 

its in open loop so the computer doesnt listen to the o2 sensors I would have someone hook it up to a diag computer there might be something there. But I would double check on vacume leaks , valve adjustment and throttle body even though you would notice problems at normal op temp.

 

It was just on the diagnostic computer less than two weeks ago... and didnt have any problems... what do you mean "its in open loop so the computer doesnt listen to the o2 sensors"?

 

Do the ecm reset procedure. If that doesn't work, (warm the car up) disconnect the iacv with the car off. Crank it up, and adjust the idle screw on the t.B. until you get a steady idle.

Once you get the idle where you want it, turn the car off. Pull the ecm fuse ("Clock fuse") wait 1 minute, plug the iacv/ecm fuse back in, and turn the engine back over....it should maintain idle, with No surge. That should work.

If not, full coverage is always an option....I'm ready to drive mine off a cliff as I type...

Easier said than done right....Mines giving me issues right now....I forgot to do something...... I'm pissed also

 

Start with the easy **** first like resetting you ecu, and cleaning the valve.

When working on a car that's run by a computer, you have to make the mechanical adjustments, than let the computer realize what adjustments you've made by unplugging it....."Drive by wire", it's not auto mech. 101 like rebuilding a carburetor. This fucken technology is fucken with us both.....I'm with ya' brother.

 

When your car is cold the computer doesnt make adjustments with regard to what the o2 sees (rich/lean) . I would advice not adjust idle screw when the engine is cold. If you have no problems when its warm and no codes other then cleaning parts there might not be a problem. If I were you I would clean the idle valve (remove it from intake) clean throttle body, adjust timing, and adjust valves.

 

yea i actually had realized earlier that i hadnt disconnected the battery cable since i have done all the maintenance to the car... so i unplugged it, but it is still warm... so i figure i will wait until tomorrow and see if it is still surging at that point....

I know the one vacuum hose going from the intake tube to the valve cover had a crack in it prior, and that was around the time i think it cracked that i started having these surging problems... so im thinking, i *hoping* that it is just a matter of resetting the ECU. But i will find out tomorrow..

 

i didnt read any of what people said cuz i have the exact 1500-2000 idle surge. its your FITV.

especially since u said on warmup, only culprits are IACV or FITV.. and the IACV one makes ur idle bounce slightly not 500rpm surge..

some feller named mgags explained it to me

 

okay.... coming from a background in muscle cars and not having any knowledge in computers in the modern cars... I could tell you every part on a 60s era motor lol... but these computers have a lot of sensors and crap i just dont know about.. but hey, its time to learn, i guess?

what in the hell would a FITV be?

 

fast idle thermo valve, its on the bottom of your throttle body with 2 coolant lines to it

actually gimme a minute ill load a pic.. lucky you i guess.

 

"Do the ecm reset procedure. If that doesn't work, ****(warm the car up)**** disconnect the iacv with the car off. Crank it up, and adjust the idle screw on the t.B. until you get a steady idle"
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I think I clarified that......

 

Thanks for the pic "dagle"

 

well.... after disconnecting the positive cable... that didnt do anything.... it still surges only when its cold from 1500-2000.... but once its warmed up the idle goes back down...

im sure i "reset the ECU" properly right? just disconnecting the battery for a few minutes, then hooking it back up?

okay, so next step?

and i cant do the IACV thing because when the car is warmed up, it idles fine!

so, what do i do about this FITV? and how would i test it?

 

well, i cleaned the throttle body, and the FITV thing... then also screwed it down like ti says to in this thread:
https://honda-tech.com/zerothread?id=1979500

It's idling high when its warm, but its suppose to do that right? well, i will take it for a drive and see if it surges when i am at a stop like it used to...

 

well, it appears to no longer be surging... not sure if it was cleaning the throttle body (i doubt it, it didnt seem very dirty)... so it must have been the FITV thing... also, there seems to be and oily substance in my throttle body... and into my intake... thats not normal, is it?

 

no.. def not supposed to be oil in there... might be coolant since thats the closest thing to the tb i can think of thats liquid..

 

it looked almost brown... but, i think i need to flush my coolant system, because i noticed that the coolant looks kinda brown at the top of the radiator cap.... so it might be coolant... but, still coolant shouldnt be leaking?

it wasnt oily though, seemed really liquidy.

 

how would coolant be getting into the throttle body/intake?

 

i would say its oil from your PCV check to make sure its not stuck open

 

https://honda-tech.com/zerothread?id=1979500

 

hey flyrod,

before just posting a link to another thread about the ultimate surging fix... try maybe looking at a few of the posts first.

First of all, It's much easier if this certain sympton can be narrowed down to just one part... and

Second, ITS ALREADY FIXED!

so next time, if your gonna be a jackass, make sure to be a good jackass.

 

lol i was going to say the post of the link was pointless at that stage, but he was trying to help

 

i use to have this problem too... pulsing when its cold and stopped once its warm i tried all of these methods on fixing it nothing happend now i have a check engine light 14 which is the IACV and cleaned it looked at it nothing wrong reset the ecu and now its just pulses all day... any other ideas