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Idle not holding...

 
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Old 12-12-2012, 02:41 PM
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Idle not holding...

Ok so first post of mine, So forgive me if this has been troubleshooted before. I tried my best to search through but no luck. When the motor is still cold and let me specify my thermostat is at its normal temp but the car has not been driven more then 5 minutes, Ill be driving and once I shift into neutral the idle drops all the way down to 200, sputters and picks back up amazingly enough from 200 rpms. sometimes it wont even try to catch itself just straight die. When it drops it litterly just passes where its supposed to stop and then its like the motor relizes its about to die and picks back up. after 5 min of driving this problem dissappears.

The only thing I can think of is maybe it has something to do with the intake temp because I have bleed the coolant over and over, Ive checked my tps, and I will clean Iacv but from what I have read that rarely fixes any idle issues like this. I can understand Vacum leak but why does it go away after 5 min?

Recent work done by myself...

JDM H23a Swap
OEM Water Pump
OEM Oil Pump
OEM Timiming Belt
OEM Timing Tensioner
New Laser NGK plugs and wires
K&N Box filter
EGR Valve Cleaned throttle body, intake etc.
New 02 sensor downstream
All new seals from litterly the intake through the cat (Rear main, Cam, Filter housing, Oil Pan etc.
F1 Clutch
F1 Pressure Plate
F1 Throw out bearing
CV axles
Rebuilt the power steering pump
All new belts
Etc.
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Old 12-12-2012, 03:20 PM
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Re: Idle not holding...

you could try a seafoam treatment, is this something that just started? since you did the swap, did it ever work correctly? or is it something that happened from the new engine?
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Old 12-12-2012, 03:38 PM
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Re: Idle not holding...

I actually had one done recently used about 1/3 of the bottle. The car has had so many issues and ive just about fixed everything other then this, but the problem just started one night driving back to my house, just before that I rebleed the system because I thought I heard air bubbles which I know sounds crazy but I heard like sloshing fluid so i figured water pump was hitting a bubble. It did just start getting cold that night though so thats what led me to thinking it was the intake temp...
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Old 12-12-2012, 03:46 PM
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Re: Idle not holding...

Oh one more thing is that I misplaced a hose during the swap and replaced it but its a little longer than what it should be and kind of curves so maybe airbubble stuck there? its the one that goes from the black hollow bar from behind the motor into the firewall im assuming heater core. theres a opening closer to the water pump end of the black hollow bar im describing... When the motor is hot your radiator hoses should be pretty stiff right? indicating that the pressure is built up? I need to feel that hose or get a pressure tester for the coolant system.
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Old 12-12-2012, 06:46 PM
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Re: Idle not holding...

sounds like you've done a ton of work and except for this issue are good to go for quite a while.
ok, first off maybe you can let the car warm up longer until this issue is solved.

if the heater hose you mentioned is above the bledder then yes it could have a bubble. but i don't think that's the issue. did you take off the fitv, and adjust it as per the final idle thread instructions in the 5th gen resource guide? it senses the water temp and when warm water passes through, lowers the idle thinking the motor is warm. what does your car idle when not doing the stall thing? bout 700 is warm idle. 1100 is cold idle. fitv controls that. it's near the throttle body inlet.
a small vacuum leak may be present when cold and not when warm. stuff expands when heated and vice versa. know what a smoke test or soap test are? vacuum loss tests.
maybe it's your tb has a slight vacuum leak.

hondatech.info: Honda service manuals
if you don't have a manual click the link above.

hope you get it solved soon. i know of a 91 si auto that simply refuses to go anywhere without 10-15 minutes warm up in cold weather first start of the day. 5-10 in the summer. your car is getting old. treat it good and it'll love you back.
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Old 12-12-2012, 10:50 PM
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Re: Idle not holding...

Thanks man I hope.it does last a while. well I hav not tried the fitv that will definitely be next to try, that sounds like it very well could be the problem. it idles at around 600-+50 . I just recently bought a vacuum tester ill give it a shot on that as well would you happen to know what the vac tester should read? I do have a Manuel and ill check it out if not. And ill double check the tb. thanks again.
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Old 12-13-2012, 07:47 AM
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Re: Idle not holding...

new distributor cap and rotor
new fuel filter
check/new IAT, map and pcv

clean iacv, fitv, injectors

check vacuum/exhaust leaks
check all hoses
check timing

adjust idle from tb's screw (and throttle cable) and adjust ignition
adjust valves
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Old 12-13-2012, 09:00 AM
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Re: Idle not holding...

600+/- 50 is a little off but not bad.
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Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead
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Old 01-25-2013, 05:31 PM
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Re: Idle not holding...

Thought I would give anyone who has this issue and the posters a update...

Replaced PCV valve and the grommet...

Replaced fuel filter...

Did a AC delete because I thought that my AC compressor bearing was bad causing a high load. Found out that the AC dosent really have a bearing

Did a power-steering delete because im effin tired of fixing leaks on the power steering (even though I just rebuilt the dang pump).

Cleaned the FITV and adjusted it.

Cleaned the IACV and replaced some gaskets/seals on it.

Re-bleed the system.

Still having Idle drop...

Im going to do a fog smoke test for Vac leaks soon but please if anyone knows what causes this issue in preludes so much let me know!

Would a vacuum leak not cause a high idle? I mean really if the map is sensing X amount of air and there is air getting into the cylinder from somewhere else then that would cause your idle to raise because there is unaccounted for air getting into the cylinder.
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Old 01-25-2013, 07:39 PM
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Re: Idle not holding...

Different car but when I had a vacuum leak on my s2k it would idle really low as well to the point where I thought I was going to stall out.
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Old 01-27-2013, 01:24 AM
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Re: Idle not holding...

I say try valve adjustment..
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Old 03-13-2013, 04:58 PM
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Re: Idle not holding...

*Update. Installed a vacuum gauge to moniter vacuum. At idle im looking at around 15 in.hg, accelarate is at 5 in.hg and engine braking is around 25 in.hg. also installed air/fuel and the trim seems normal. Can anyone share there idle in.hg with me to see if i am lossing vacuum anywhere? Thanks!
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