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BIG IDLE PROBLEM ( I have read the final idle THREAD)

 
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Old 10-12-2011, 04:25 PM
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BIG IDLE PROBLEM ( I have read the final idle THREAD)

Hi guys, well the one morning we started up the prelude and it immiadiately started idling at 2500rpm, we thought ok maybe its just the cold start choke doing something odd, but after waiting a while and tapping the accelerator the revs then rose and dropped to 1500 rpm and without even touching the pedal the car will jump rpm's from 1500 til about 2500 and back down again, and no matter how warm the car is the problem still persists.

It is a prelude SI F22B DOHC non v-tec manual.

I went through the FINAL IDLE PROBLEM THREAD and even printed it all out for the mechanic and he said he cleaned out the IACV and the FTIV and checked all the usual suspects, he has done work on the lude before as he stripped and re-installed the head after it was stitched but after 3 days of looking at it he stil cant really figure it out, now he is saying he got someone to come do diagnostics on the car and found that it needs a new "slide valve" or something like that, have you guys heard of this part? what is it and where does it sit exactly? any help would be great as this is a really irritating problem.

Thanks
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Old 10-12-2011, 11:41 PM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

I am having the exact same issue on an H23. I have replaced the IACV, FITV, and EGR. I get a CEL, but no codes when I jump it. I am about to clean the IAT and if that does not work I am removing the entire intake and replacing/retorquing all of the gaskets.

Tomorrow I will put up some pics of a few plugged vacuum lines that may or may not be the culprit(s)
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Old 10-13-2011, 12:01 AM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

Could be an air bubble in the coolant or a vacuum leak. If your mechanic honest-to-goodness cleaned the FITV and IACV, then I would check the coolant and replace the vacuum lines. It would cost $10 at most and it is basic maintenance at this point in the game.

P.S. Cleaning the FITV isn't the real cure! The secret lies inside of it. Take the flat plate off (held on by 2 philips screws) and tighten that wax/plastic washer back in tightly, then back it off a quarter turn. Wouldn't hurt to remove the washer and clean it first.
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Old 10-13-2011, 03:28 AM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

Hi guys, thanks for the replies, ok now the problem is this is my friends car, and she will rather listen to the mechanic whose only ever worked on 1 prelude before (hers) than to take advice from guys like you who have worked on preludes constantly and know the common issues, so its kind of hard for me to tell her what the mechanic must check, but the mechanic had put in coolant recently after the head was stitched, to bleed the coolant system to check if theres bubbles can i just open up the water sender on the thermovalve and make sure it bleeds out water only then close it?

also any pics of the suspectable vacuum lines would be great, the mechanic said he tried cleaning the iacv and fitv more than once, but whether he took a proper look at the fitv is unknown, he probably just popped it off and sprayed carb cleaner inside, SIGH, im not sure what to do, its problems like this that are the reasons she wants to now get rid of the prelude which will be sad to see it go as it has so much potential, but its all up to her.

Any more feedback would be great! thanks in advance

Oh and ACIDBABY let me know when you figure it out, perhaps we could use the same fix, but i dont think her prelude is having a CEL displayed while the car is running.
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Old 10-13-2011, 11:20 AM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

Did you reset your ecu -_-' after you cleaned those parts
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Old 10-13-2011, 11:29 AM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

i like wut speedy said did u catch the idle relearn and ecu reset part of the thread?
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Old 10-13-2011, 11:42 AM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

honestly first try getting a funnel wraping a paper towel or rag around the bottom of it making a tight seal around the funnel and radiator opening the funnel should not be able to move.
then add coolant into the funnel and see if it takes it down the car does not need to run to push out airbubbles yet.
if it takes the coolant down keep adding till it wont anymore even after squeezing the hoses.
then open the bleeder valve on the thermostat housing and see if any air comes out of the line if there is i staedy coolant flow then thats good you can now start the car and let it warm up to half temp to open the thermostat make sure heat is on full blast and hot.
by now the idle surge should be gone and just keep adding coolant till hoses are filled and you can feel that by squeezing the lines and ofcourse it wont take anymore coolant dont worry about overfilling as you have a bleeder valve to release any overfill if the problem persists i know of some other things tha can cause the problem feel free to contact me 651-500-7939 my name is taylor
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Old 10-13-2011, 12:52 PM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

Hi guys, once again thanks for the new responses

i dont know if the ECU was reset, do you mean by just unplugging the battery and letting it restart? or is there a special way? like i said its a friends car and she does not want me touching on the engine so the mechanic has been doing all the work, i did not see anything on the final idle thread about resetting the ecu?

Also now the mechanic has said that the part needing replacing ( the slider valve thingy) is actually the VAC valve so now my friend has phoned honda here and they said the VAC valve for the prelude will be R1500 (around $166) where is the VAC valve and could it be the problem? i dont think these people really know whats going on with the prelude that well, and to take the car to an authorised honda workshop is a F'ing rippoff over here.

tbathurst that would be a great help however i am in South Africa, and for me to phone from here would be quite expensive haha, if you have an email address you could PM me and we could share some ideas, thanks a lot!
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Old 10-13-2011, 01:29 PM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

Please slap your mechanic
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Old 10-13-2011, 01:36 PM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

If you meant the iacv then it could possible be the problem

Any auto parts store carries this part for less the 100 lol
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Old 10-13-2011, 04:05 PM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

Make sure the $%&@ing washer/nut is tightened down inside the FITV damnit!
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Old 10-13-2011, 04:38 PM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

Lol, well after all the bloody different stories im glad to report back that the car is now fixed! however i am still not satisfied as my friend cant tell me exactly what they did, apparently they fixed a valve on the intake, this was now done by another mechanic as the 1st guy couldnt fix it! so yea, it probably was the IACV or the FITV. if i did the job myself then i atleast i would know and i wouldve been at peace, but like i said im not alowed to touch on that engine lol.

but anyways guys thanks for all the help and info anyways.
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Old 10-14-2011, 11:39 AM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

glad someone figured their problem out but i cant believe we dnt get closer on wut was actually wrong. For future reference to all...all sensors work with electronic signal whether it be controlled by coolant temp oil pressure or vacuum its all electronic sooooo.....all sensors r testable to c if they work properly, if u need exactly how ask this mofo i got the prelude bible some 1200 pages of awsomeness so dont let ur mechanics steal ur money if u have a tester it may need to test amps, volts, or resistance. if u got that u can figure anything out by jst testing the plug in the harness
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Old 10-14-2011, 01:02 PM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

Hi dizzlgmore, i know what you mean, i myself dont feel at peace, i want to know what it was, i looked everywhere for a good service manual that includes the prelude with the F22B engine, what is this "the prelude bible some 1200 pages of awsomeness" you are speaking of? i would love a copy!!! haha
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Old 10-14-2011, 02:48 PM
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Re: BIG IDLE PROBLEM ( I have read the final idle THREAD)

sure is only prob is i got it with the car so i dnt know where to get one and he did say it was over 150 bucks but i can take the car down to a bare shell and reassemble. ive gone years with haynes and hilton manuals and those r vague and stupid. it covers f22 h22 h23 and its authentic honda manual like the dealerships
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