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Inconsistent/Erratic Idle

 
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Old 08-11-2008, 12:07 PM
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Inconsistent/Erratic Idle

I had to share my success story!!! I like working on my car and learning about it and this time it PAID OFF!!!
Oh, May I say a great big Thank You to PZ for all the AWESOME information I found posted that led me to my current bliss!!!
--and a quick tutorial for those fighting the same issues:--

History: EVERY since I got my baby I have had issues ranging from severe to outright embarrasing in regards to the inconsistent idle issues. The engine was put in in 2003, misc small problems ended up with me taking it to a shop and as part of the repair, i had the gentleman take off and clean the IACV... seeing as how I found out a new one cost over $400!!!
It worked for a VERY short time. I thought it was me and the fuel I was using. Changed my fueling habits, let the car completely warm up before driving, put additives in the fuel to "Clean things up" - still, after more than 4 years the idle was still driving me to the point of insanity. No matter what anyone tried, it would NOT go away!

Solution: I was very bored this weekend and was researching this issue on the forum and everyone kept reffering to a vaccum line issue. I have checked my vacuum lines NUMEROUS times, even the dangerous old way of letting it suck in propane.. NEVER did find the problem... in the past... I noticed each one of the vacuum lines Had a number on it, so I downloaded the PDF manual available HERE As I was waiting for the slow *** connection (house-sitting this weekend) I pulled up a few more threads and learned that an old hose can lose enough pressure around the brass fittings; enough to cause a vacuum leak too. So, While that was D/L I ran to the Parts store and picked up about 6ft of small vacuum line. -- FYI: 8 feet would have been more appropriate. --

I got back and printed out the page I needed and started replacing the lines one at a time. They were coming off way to easy--maybe I found the issue??? I was working on the two lines that are on the back and top of the fuel manifold and dropped the knife I was using. I cursed a little then reached down to grab it and found a loose hose! Carefully I pulled it up and it had #12 written on it.. the end was all full of gunk-- I looked at the schematic and it belongs on the OTHER side of the intake!! WTF! There is a small little brass nipple on the drivers side of the intake/fuel manifold kind of down towards the bottom. IMO it is a bad design because it is so small -- BUT, there it sat. So I cut a new line and re-hooked it up to this point, and placed a small wire tie to make sure it doesnt slip off.

I started the car and it revved up to about 1800 while it was warming up. As soon as the first temp gauge light came on I took it around the block. stopped back in the driveway and perfect 800 RPM idle!!!!! I parked it.

this morning was the true test, From where I stayed I have a 30 minute drive to work... it normally acts up after it is warm... It never Surged, sputtered, revved, or acted up on me!!! Gawd dang I am sooo happy!! My baby is healthy again!!!!

so there you have it... a LONG story but a successful one at that. I am VERY Proud I found and fixed a problem that MANY different Mechanics have NOT been able to resolve!!!!
I will post detailed pictures of the location/repair when I get home Wednesday to my own computer/network!
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Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

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Old 08-11-2008, 12:30 PM
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Re: Inconsistent/Erratic Idle

Nice can you get a pic of what you did!!
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Old 08-11-2008, 12:52 PM
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Re: Inconsistent/Erratic Idle

Yes sir!! Coming soon with detailed pics.. i promise... I am house sitting until Wednesday night-- I dont have all my gear with me.
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Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

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Old 08-12-2008, 10:32 AM
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Re: Inconsistent/Erratic Idle

Quote:
Originally Posted by LilMsPrelude View Post
Yes sir!! Coming soon with detailed pics.. i promise... I am house sitting until Wednesday night-- I dont have all my gear with me.
Thanks for this sooooo much dude. I have the exact same problem, but i'm just forking out 1500 for a respray so can't be arsed to get someone to look at it. I'm going to try this. Its really annoying at zebra crossings; Old people think you're revving cos you're impatient...well actually i was....but its annoying anyway.
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Old 08-12-2008, 10:52 AM
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Re: Inconsistent/Erratic Idle

im going ordering some new vacuum hoses during the week, i've been meaning to do it for ages because i have a similar problem and my god it has been driving me mad! hopefully it solves my problem too
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Old 08-12-2008, 11:02 AM
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Re: Inconsistent/Erratic Idle

I would replace EVERY line you can get to no matter its physical appearance. The ends can become wore and loose enough to allow a vaccum leak. Mine were the original lines from 1992!! LOL!
Honda was generous enough to their mechanics to actually number the vacuum lines, unless you buy an exact replacement kit, you MAY have problems in the future. I devised a little trick that I use in Car Audio and I am going to apply it to this as well.

Get a labeler and print out the appropiate numbers (two each) for each of your vacuum lines. Then use some clear heat shrink tubing, cut it about 1.5" and heat it just enough to encompass the label you wrapped around the hose. Slow heating is the trick to preven burning or scalding so you can still see the number through the heat shrink tube.
http://cableorganizer.com/heat-shrink/heat-shrink2.htm
or
www.partsexpress.com are the two places I normally get the tubing from.

An Ounce of prevention is worth a pound of cure!
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Quote:
Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

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Old 08-12-2008, 11:25 AM
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Re: Inconsistent/Erratic Idle

sounds like a good idea, i might just do that! i don't plan on selling the car so it will be me i will be helping when i decide to change them again in another 17yrs ha thanks
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Old 08-20-2008, 05:42 PM
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Re: Inconsistent/Erratic Idle

I have the same problem with the idle reving up and down.. (well right now my car won't start... but that's in another thread lol).

I took it to a mechanic and he said it is the TPS. He said sometimes he gets volts coming from it and other times he gets 0 volts. It makes sense that this is the problem but I just don't trust mechanics a whole lot.

I have this vaccum hose that is just chillin and I have no idea where it goes. The mechanic said it was fine to just plug it up because he thinks it went to the throttle body or intake manifold that was stock on my car... My intake manifold and throttle body are stock! They are so old there is no way they could be different... but I'm not so sure.
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Old 08-20-2008, 06:26 PM
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Re: Inconsistent/Erratic Idle

I apologize I have not got any pictures up... my computer business is keeping me super busy!
I assume you are also driving a 4th Gen?? 92-93??? I will not say the mechanic is wrong about your TPS... but I was told the same thing... and it didnt make a difference. I was also told the IACV was the issue-- I had it cleaned and the issue went away for about a month.. then it started doing it again. All the little symptoms didn't add up until I got pissed about it and started researching.
I WILL post up REAL pics of mine plus a Vacuum line diagram that will help you discover what goes where. There TRULY is only ONE Vac line that should be plugged!!!! (I'll show you that one too.) EVERY other line has a home and REALLY needs to be hooked up... Honda's can be sooooo picky!!!!!

Do you still have the original Lines??? They should have little white numbers on them.
If they are original you should consider just replacing them all... even a small leak can be detrimental.
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Quote:
Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

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Old 08-20-2008, 06:37 PM
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Re: Inconsistent/Erratic Idle

Yes I have a 92 honda prelude si.
I've heard it could be the IACV too. It is all a lot to think about. lol.

Yeah They are the original lines and it has the number 3 on it.

Thanks
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Old 08-20-2008, 06:46 PM
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Re: Inconsistent/Erratic Idle

there is a great thread in the DIY section here about how to clean the IACV yourself.. when you price it out you will see why this is a good idea! LOL!
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Quote:
Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

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Old 08-20-2008, 07:41 PM
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Re: Inconsistent/Erratic Idle

OK.. here are some pics...

this is the issue I had, and fixed.... as you are standing in front of the car you need to go to this area (red arrow)




Down towards the bottom:




THIS is the one that had been disconnected:



this part is easy to get to.. the other end is the bugger!!!!


Here is the Vacuum Schematic you need to print out and follow. If you want a larger copy, PM me and I can e-mail it to you. n/c
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Quote:
Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

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Last edited by LilMsPrelude; 08-20-2008 at 07:50 PM.
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Old 08-20-2008, 07:50 PM
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Re: Inconsistent/Erratic Idle

SHRoadrunner.... here is some close ups in my engine bay of where your #3 line should be hooked up. (also refer to the schematic above)

This time we are on the passenger side of the vehicle. (for left hand drives..lol.)




it starts at the Evap Purge COntrol SOlenoid on the firewall-- it is the item with the black, round cap on it.
I have circled the ONLY LINE that should be plugged... period.. everything else SHOULD be hooked up to something!

The #3 line is then routed along the firewall and goes to the EVAP Purge COntrol Diaphragm Valve (on top of the canister) this is underneath the air intake..save your self some trouble and take it off.



Another view from the front:
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Quote:
Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

_____________________
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Last edited by LilMsPrelude; 08-20-2008 at 07:57 PM.
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Old 08-20-2008, 08:49 PM
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Re: Inconsistent/Erratic Idle

Thought i'd just say that i've fixed my erratic idle problem. It was nothing to do with what has been mentioned here. It was because my subs were slowly frying my alternator. I don't know exactly why it messed up the idle but i suppose the electrics that deal with everything (technical talk here) were effected. I put a new alternator in and its fine now. weird.
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Old 08-20-2008, 11:29 PM
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Re: Inconsistent/Erratic Idle

hey LDB.... kind of off topic here....

In your sig pic it appears you are using the same air intake as I. Have you noticed a slight whistle to it? Like under acceleration (not necessarily severe) At first it sounded like a bad, but relatively quiet, bearing. I was afraid I had received a bum water pump.
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Quote:
Originally Posted by shatterbox View Post
People say the biggest difference you can change to your system is to add a subwoofer. Which is true, it is the most noticable difference. But running an amplifier to a good set of speakers makes the BEST difference.

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Old 08-21-2008, 04:50 AM
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Re: Inconsistent/Erratic Idle

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Originally Posted by LilMsPrelude View Post
hey LDB.... kind of off topic here....

In your sig pic it appears you are using the same air intake as I. Have you noticed a slight whistle to it? Like under acceleration (not necessarily severe) At first it sounded like a bad, but relatively quiet, bearing. I was afraid I had received a bum water pump.
No it DIDN'T make any whistling noise. But i had my alternator rebuilt, cos i've just spent 1500 on a spray job and feel poor (pictures to come), and that seems to whistle. But its getting quieter. My dad said it maybe the new bearings in it. But tbh when i first heard it i thought it was my water pump.
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