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Cold start surging idle issue...again

 
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Old 01-26-2012, 02:20 PM
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Icon8 Cold start surging idle issue...again

Hi everyone,

Just as a disclaimer, I have used the search function and have gone through various prelude forums to search for the problem. Some threads were old, some were unresolved, and some were unclear, so I was hoping for some new insight from you experienced luders here :)

As fall came and winter arrived this year, my lude was idling perfectly fine and steadily @ 2500 on cold days when the engine was cold (yes, that is pretty high, but whatever) and as the engine warmed up, the idle would drop down to ideal idle conditions (around 500-800).

Recently, about a month ago, I started experiencing a surging idle on cold starts. It would bounce from 1.5-2.5k very rapidly during cold start idles for about 30 seconds, then settle at 2.5 very briefly, and slowly drop until regular idle conditions @ 500-800 when the engine was warmed up. Once the engine was fully warmed up, the fluctuating idle issue disappeared. This only happened once in a while, and usually only after the engine was fully warmed up, then cooled down after sitting for a couple hours, and turned on again. I brought it into the shop and they cleaned the intake manifold and the map sensor. Now, my lude has this rapid idle surge during every cold start. Same issue, just more frequently: fluctuating from 1.5-2.5k on cold starts for 30 seconds, settles, and drives and feels normal after the engine warms up. Again, I don't experience idle fluctuations or surges during my drive after the engine is warmed up. No CEL or codes, nothing else out of the ordinary. I do, however, have a swapped JDM H22 with I/H/E bolt-ons...not sure if that makes any difference with my issue.

Based on my research, it seems likely that the culprit is a loose FITV, coolant issue, or the IAC. I'm learning more towards the FITV. Any input from anyone with similar experiences?

F winters.
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Old 01-26-2012, 02:36 PM
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Re: Cold start surging idle issue...again

Clean out the FITV and IACV. If the plunger on the FITV is loose, tighten it all the way down till it bottoms out snugly and then loosen half way.
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Old 01-26-2012, 03:09 PM
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Re: Cold start surging idle issue...again

Even tho bleeding the coolant system is the easiest (possible) fix, I would immediately jump to the FITV, since that's exactly what its job is; to control the idle when the engine is cold. Once the engine (coolant) warms up, the wax plunger inside the FITV expands, which adjusts the idle accordingly.
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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 01-26-2012, 03:58 PM
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Re: Cold start surging idle issue...again

might sound funny but i used seafoam (half in the tank half in the crankcase) and corrected my idle issue. but what these guys are saying makes sense. Hell I would even do both! why not? seafoam is great stuff regardless.
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Old 01-26-2012, 04:51 PM
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Re: Cold start surging idle issue...again

mine done somthing similar whenever my radiator was leaking so i flushed the coolant and fixed the radiator and its idled perfect ever since
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Old 01-26-2012, 06:42 PM
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Re: Cold start surging idle issue...again

FITV most likely the problem. It's on the bottom of the throttle body and on the firewall side has two screws in it holding a brass looking plate on it. Take that o please.ff and stewed the wax ring all the way down and back it off half a turn. Easier to do with the FITV off the TB but not impossible left on, just a pain and will need a mirror. Post if this fixes it or if you've already checked
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Old 01-26-2012, 06:43 PM
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Re: Cold start surging idle issue...again

Auto correct went haywire. Take that off** and screw**
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Old 01-26-2012, 08:50 PM
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Re: Cold start surging idle issue...again

dude i have this issue also -___________- whhhaattt thhee fffaaaahhhhhkkkk
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Old 01-26-2012, 09:27 PM
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Re: Cold start surging idle issue...again

dude did you try anything here???

the FINAL idle problem thread!!!!!
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2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt

2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


Quote:
Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 01-26-2012, 10:19 PM
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Re: Cold start surging idle issue...again

^
I agree with twokexlv6coupe.... Check those first and post up. Bleed coolant- very easy. Check/clean IACV, and check the the plunger is screwed in on the FITV. If it ain't those there's only a few more things but those are the most common.
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Old 01-26-2012, 10:50 PM
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Re: Cold start surging idle issue...again

100% it's your FITV. Mine did the exact same thing, replaced FITV, problem gone. Good luck
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Old 01-26-2012, 11:11 PM
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Re: Cold start surging idle issue...again

9times outta ten you don't need to replace it man, waste of money, just take apart and fix it, if u can't fix then replace but def try to fix first, the link twokexl posted has what I'm talking about
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Old 01-27-2012, 02:29 PM
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Re: Cold start surging idle issue...again

Thx for all the replies/help everyone...very helpful, very insightful! :) I'll be bringing in the car into the shop on Tuesday to get the FITV cleaned and checked. I'd prefer not to do it myself as I'm pretty car-retarded, and, with my luck, I'd prob manage to blow up my lude while doing it. Hopefully it does the trick. Altho you guys seem a little more mechanically inclined about this particular problem than my mechanic does tbh...

Yes, I have looked under the final idle thread on this site and other lude sites (even browsed through pages of search results for an hour). I just wanted some suggestions on what to fix first, as I'd be bringing my car into the shop for each probable fix, and I'd like to limit the number of visits.

I'll report the outcome and hopefully I won't have to visit him again for a coolant flush/IACV cleaning afterwards. As for now, I'll have to deal with my exhaust making a tremendous amount of fluctuating noise during each cold start up...I'm sure my neighbours aren't pleased in the mornings lol.

Do you guys know if this problem is bad for the engine? It does sound like the engine is struggling while the rpms are rapidly fluctuating.
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Old 01-27-2012, 03:44 PM
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Re: Cold start surging idle issue...again

Bad for the engine? NOPE!!

Extremelyyyyy irritating and annoying??? hellll yessss!!!!!
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2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


Quote:
Originally Posted by Brash View Post
But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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Old 01-27-2012, 05:47 PM
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Re: Cold start surging idle issue...again

Come on man, don't take it to a shop, its two hoses, two bolts I think 10mm and two screws. Very very easy fix if that's the problem. If it is then u just saved some money...if it isn't then think about the shop. Remove ur intake, put some rags down under the throttle body to catch any coolant. Then remove the twohoses on it and the two bolts holding it to the bottom of the TB. Either way you go about it tho, good luck and let us know!
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Old 01-27-2012, 05:49 PM
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Re: Cold start surging idle issue...again

Also, I'm sure you can find a video of the process on YouTube, or at least a thread with pictures on PZ or another prelude site
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Old 01-27-2012, 10:49 PM
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Re: Cold start surging idle issue...again

youtube
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Old 01-31-2012, 11:05 PM
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Re: Cold start surging idle issue...again

Quick update:

Brought it into the shop. Mechanic cleaned out the FITV/IACV and twisted the plunger down. Coolant level was normal. With fingers crossed, went out and left the car outside for about 4-5 hours to let the engine cool down, and when it started back up, RPM idle was around 1.5k instead of 2.5k and did not fluctuate at all :) although today was one of the warmer days, I'm hoping this is the last of my fluctuating idle problems. Will see tomorrow morning....

Thx to everyone who replied again. Your support is much appreciated. I hope the next prelude (or honda) owner who experiences this issue will benefit from this thread (and the other 200 similar threads out there).

Next up: quarter panel rust repair...............
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Old 02-01-2012, 11:16 AM
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Re: Cold start surging idle issue...again

congrats good to hear!
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1995 Honda Prelude SE Turbo; 250whp, 275wtq @ 10psi Soldddd!!!

2000 Acura TL; DD
2005 Stage2.5+ Subaru WRB STi : RzKar!
Ivey Tuned - Advan - Cobb - Rallispec - CP - Perrin - ACT - KillerB - Carillo - TurboXS - Defi - Innovate - Walbro - DeatschWerks - Feal - H&R - Alpine - Infiniti - Curt

2001 Kawasaki STX1100 D.I. - Sold!
2007 Sea-Doo RXT 215; ET 127 +3 S/C impeller, DIY 3" intake, DIY resonator delete/free flow exhaust, DIY oil catch can, Rule 500gph bilge pump


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But you need that scoop on the hood. Is it true that they're big enough to fit your lunch box and all your camera gear in it?
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