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Car is reving up and down irratically

 
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Old 07-23-2010, 12:23 AM
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Icon5 Car is reving up and down irratically

Yes, i also posted about the auto tranny pcm, sorry, I am new to this working on the prelude stuff. If it was a chevy with a 350, I would be running this forum. Anyways, when I was at the dealer for the tranny, they also told me my fast idle valve(I believe that what they called it) was bad and needed to be replaced. I have already put a new IACV on it, no fixin. I have bled the radiator, no fixin. Any other ideas. Any links on how to clean it, or hell, even where its located would be awesome. I need this thing fixed for the wifey soon before she
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Old 07-23-2010, 03:31 AM
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Re: Car is reving up and down irratically

search! its in the last idle thread you've been here long enough to know these types of post piss people off!

in the time it took you to ask and wait you could have be done
it literally took my 5 seconds to find this:

the FINAL idle problem thread!!!!!
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Old 07-23-2010, 02:19 PM
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Re: Car is reving up and down irratically

Wow, you can be a prick. Just because I have been a member here since 09 doesn't mean that I know how to operate the site very good, or that I know even what to look for when I am searching. This is why I asked the experts, like you. It only took you a few seconds to link me too it. Thanks.
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Old 07-23-2010, 06:19 PM
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Re: Car is reving up and down irratically

He wasnt being a prick you could have thanked him for linking to to it. Most mods would have told you to search and closed it. I got money it is the fast idle valve. It usually always is on f and h series cars.
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Old 07-23-2010, 07:53 PM
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Re: Car is reving up and down irratically

Is it that time of the month for noobs? I have seen a few of them get all pissy
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Old 07-23-2010, 11:41 PM
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Re: Car is reving up and down irratically

very commen problem with hondas... everything you need to know is on this site.
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Old 07-24-2010, 08:27 PM
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Re: Car is reving up and down irratically

Yeah, I could have thanked him for the link, but he also could have just posted the link. The remarks afterwards were uncalled for.

Back to the subject at hand. I took the fast idle valve off the intake and took the bronze cover off and the thing that is supposed to be screwed down all the way and then backed off a half a turn(according to the link), was just a floppin in the wind. It wasn't screwed in at all. I pressed it down and attempted to screw it in as far as I could without tearing it up, but it is very difficult since it is made of plastic. What tools are out there to make it easier, or what have you all done in the past? I put it back on and it did shorten the range of reving, but didn't completely erase it. I reset the ecm, and bled the bleeder for the radiator fluid to make sure there wasn't any bubbles. Is it possible that it needs a new one regardless of getting it screwed in the right way?

My92lude-
Thanks for the link, it was very helpful.
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Old 07-25-2010, 08:37 AM
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Re: Car is reving up and down irratically

I just used a screw driver and was very careful.
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Old 07-26-2010, 03:48 PM
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Re: Car is reving up and down irratically

IACV cleaned? That's usually the case with most Hondas, hope that helps.
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Old 07-26-2010, 11:57 PM
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Re: Car is reving up and down irratically

Hmmm....Maybe I screwed up and accidentally cross threaded it. It was very difficult to get it in as far as I did. It is back to reving up to 2100 and then drops to 900 again today. It fixes itself after I reset the ECM, but I don't know why it goes back.

Yeah, I cleaned the IACV, I even replaced it with a used "TESTED" one from Beaver Honda Salvage. No bueno there either. Thanks though.
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Old 07-31-2010, 06:37 PM
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Re: Car is reving up and down irratically

I had that same problem and my mechanic said there was a lot of air trapped in the engine itself not the radiator. He said he released all the air he could (I don't know how he did it) but I never had a problem after that and now I idle at 500. nice and smooth. It used to idle and rev up to 2000 and down to 500 and back to 2000 very annoying and embarassing at a light however, now it dies on me when it gets hot outside.

My mechanic thought it was the distributor but the engine still dies after we put a brand new distributor and coil in (while driving on the streets) and they can't figure out what the issue is. its in the shop right now. got any ideas there? I posted it already in another forum but, you never know who knows something, its called networking lol.
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Old 07-31-2010, 08:37 PM
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Re: Car is reving up and down irratically

Usually clean the IACV, and FITV with carb spray. And Tighten the spring loaded plate in the FITV all the way down. If that doesn't do it, maybe flush the radiator. Could be an air bubble.
That's all I read when I had the same problem, and it fixed mine. Was just the IACV, and FITV though.
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Old 08-01-2010, 05:58 PM
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Re: Car is reving up and down irratically

I worked on the car this week a lot(cleaned IACV and FIV, changed tranny, pulled interior to dry it out, including both front seats, rear, carpet, console). The car still idles uncontrollably until it gets warm, then it smooths out at 900. I am guessing that I didn't get the screw in the FIV all the way down. Now I am having troubles with the "new to me" tranny. It acts like its slipping between gears already. I am hoping its the tcm. Got a mechanic coming to look at it next weekend.
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Old 08-04-2010, 06:06 PM
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Re: Car is reving up and down irratically

I had the same problem with an old b16a 94 civic hatchback. Cleaning the IACV didn't do anything for me but swapping out the wrong ecu sure fixed the problem... Make sure you've got the right computer in the car (or that it's working properly). The dough heads who owned my old civic before me did the swap incorrectly and put in an ECU for an auto trans, not a 5speed like the car had. I'm not 100% sure if this directly affected the idling of the car (don't know a **** ton about car computers) but changing the computer completely corrected the problem. But MAKE SURE, because good car computers aren't cheap...
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Old 09-15-2010, 03:51 PM
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Re: Car is reving up and down irratically

same issue its pissing me off ive changed iacv and redid my valves to no luck
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Old 07-10-2012, 01:10 PM
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Re: Car is reving up and down irratically

Thank god for this thread.
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Old 08-26-2012, 12:50 PM
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Re: Car is reving up and down irratically

Thanks on the info I'll try all of the above
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Old 06-08-2013, 05:53 PM
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Re: Car is reving up and down irratically

I know what i'm not asking about....thanks for the link
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Old 06-09-2013, 09:32 AM
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Re: Car is reving up and down irratically

I like seeing these ancient threads pop up.

Besides the nostalgia, it shows the poster has been researching...
Good job vzwild.
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