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Stumped- throttle problem?

 
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Old 10-12-2012, 11:10 AM
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Stumped- throttle problem?

Howdy fellow luders. I've been experiencing some difficulty with my 2000 base prelude. I've read through dozens of threads and tried many fixes, none have helped yet. I explained in as much detail as possible, let me know!

Known symptoms and tests:
2000 Honda Prelude was running high idle (1500rpm). After engine warms-up, it would begin to surge, jumping from 1000rpm-1500rpm. After about 30 minutes driving, Check Engine Light would turn on, CEL 14 = Idle Control System Malfunction, and idle begins to surge rapidly between 1000rpm-1200rpm, and the car runs very very rough.
So my temporary solution was to adjust base-idle screw, to bring down the idle, which prevents CEL from coming on, but the car still runs a little jerky/ jumpy on acceleration/deceleration/gear shift/slowing to a stop/driving very slow.
I believe this is affecting the way I take-off in 1st gear and reverse, where in healthy standard cars you donít need to gas much, or at all, my car would stall-out unless I applied throttle
Also, I noticed that when revs are dropping to base-idle, it bounces up to 1000rpm before settling down at 700rpm.
Things Iíve done:
-Replaced and tested Fast-idle Thermo Valve (FITV)
-sucks more air when coolant cold
-Cleaned and replaced Idle-Air Control Valve (IACV)
-Cleaned and Replaced Throttle Body
-adjusted base-idle screw by 2.5 turns
-throttle plate good
-Cleaned EGR
-replaced PCV
-New MAP sensor
-tried using brake cleaner for vacuum leak test
Multiple mechanics have told me itís not a vacuum leak.
-Recently done cap, rotor, coil, distributor, plugs and cables


No serious mods - air intake, muffler

Ideas??
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Old 10-12-2012, 11:27 AM
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Re: Stumped- throttle problem?

try to adjust ignition
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Old 10-12-2012, 11:10 PM
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Re: Stumped- throttle problem?

Try bleeding the coolant system.
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Old 10-13-2012, 01:35 AM
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Re: Stumped- throttle problem?

Both interesting suggestions...
I once tried adjusting timing, and thought they couldnt be done, but found ur supposed to jump the service connector, so this is priority tomorrow.

As for bleeding the coolant, is there really a good way of doing it, or is opening the bleeder valve good enough?
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Old 10-13-2012, 04:00 AM
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Re: Stumped- throttle problem?

did this problem just came out itself or after something you/someone did to your car?
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Old 10-13-2012, 02:19 PM
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Re: Stumped- throttle problem?

I'm pretty sure it happened while I was taking stuff off to fix something else.
That's why I like the previous responses, because I have taken off the IACV and FITV many times, so coolant might be an issue,
but I also have replaced the distributor, so timing could also be it.
Gonna work on it now, let you know how it goes
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Old 10-13-2012, 04:22 PM
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Re: Stumped- throttle problem?

Ok, so I turned the base-idle screw back 2.5 turns to bring it back to OEM setting, this brought my idle back to over 1000rpm, which eventually triggers CEL 14.
coolant looks good, and I tried adjusting the distributor with the OBD connector jumped, and it doesn't do anything... and again, threads say 5th Gen's can't adjust timing...

So any ideas to fix the idle RPM?
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Old 10-14-2012, 05:31 AM
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Re: Stumped- throttle problem?

you can adjust ignition from distributor

code 14 Idle Air Control (IAC) Valve, Defective cicuit or unplugged/defective sensor

how about if you try to recalibrate tps and check if its working? or get a new one and calibrate it

check grounds too

5th Gen Idle and stalling troubles... - Honda Prelude Forum - Prelude Online.com

theres same kind of issue?

Last edited by TypeT; 10-14-2012 at 05:34 AM.
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Old 10-14-2012, 12:47 PM
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Re: Stumped- throttle problem?

No its not the same issue. His idle dips low, mine goes high.

Tps is good too. It's my third one, and has been voltage checked.

You may be correct about the IACV. Even though I replaced and cleaned it with a used one, something might still be iffy.
The top hole inside the throttle body is the air-bypass for the IACV, correct? If so, it is letting in a lot of air. When I plug it with my finger, it falls right back down to normal operating idle.
I will try testing the resistance (between 7 -13 ohms i heard?)
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Old 10-14-2012, 02:56 PM
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Re: Stumped- throttle problem?

check that your throttle cable is not too tight so it wont your car idle correctly
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