hi guys i have a 94 prelude si, it was auto swap to manual and it has an idle problem wen the car's idle, it will keep reving itself nonstop 1000rpm to 2500rpm even wen the car is warm. i had already tried cleaning the throttle body and IACV wit carb cleaner but it was no help. i checked all vaccum lines and no leak. tried to adjust the throttle body screw to tightest, just made the revving faster. wat else can i do to fix the problem?

Check the coolant it maybe low or it have air in the system. Also IACV maybe it, unplug it if it stays running that is the issue. Now for a getto fix on the IACV put tape over one of the ports it will keep it from revving and will not hinder how the car runs. A good friend of mine has had his car just like this for about two years now.

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mike the miz



Club Ultimate Sleeper

Yea i had a surging idle also and that ghetto fix worked for me, just wonder if its is the IACV that is bad on mine or it could be a a bad throttle body gasket just letting in too much air. Who knows.

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1992 Prelude si 4ws H22A swap
WingsWest Big Mouth Kit,Shaved Handles,
emblems, Stock si wheels atm, Tokico Blues,
Tein lowering springs, MSD Cap
and coil, NGK IRIDIUM IX Spark Plugs, NGK Wires,
6000K Hid's,5 speed swap, fidanza 8lb flywheel,
Walbro 190lph fuel pump, Vtec front brakes,
Powerstop drilled/slotted rotors,
Powerstop ceramic pads, 70mm OP Throttle body
Vibrant StreetPower Axleback
1993 Impreza
RIP 1990 Nissan 240SX Coupe w/redtop SR20DET
2007 Subaru Forester
1995 Ford Ranger
!990 Integra DA
1951 Ford Hardtop

well take the getto fix off and spray some t-body cleaner around the t-body wile the car is running if it stops the crazy idling then that is what it is, but if the getto fix fixed it then the IACV is the issue.

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mike the miz



Club Ultimate Sleeper

my 3rd gen did this, and i wanna say it was the o2 sensor, I also had a blown head gasket...It was one of those two things cuz I fixed them both at the same time and the crazy rev went away

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Could also be the FITV (Fast Idle Thermo Valve). Since you said you already cleaned the IACV, I would say it was probably the FTIV.

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Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer

It could be any number of problems. All of the problems you said are correct, but it could be your tps(throttle position sensor), map(manifold absolute pressure), or a combination of the 2.

He's right. The notorious idle problem never has one sure-fire solution. Basically, start with the most likely of the bunch, fix it, and if that doesn't solve it, move on to the next one. That's the only way.

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Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer

ok it can be the FITV, intake mani gasket, vac leak, IACV, coolant, or a tiny unicorn.

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mike the miz



Club Ultimate Sleeper

Tiny unicorns ****ting in the filters...ftl.

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Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer

well i also have a idle problem from 1000-2000rpm

i unpluded my iacv an it just bonces at 1 lol constantly.

Guys can you tell me if I have to buy a new IACV? I'm also having a bouncing rev at stop lights and so fourth. I took off my intake and stuck my finger over the bottom port, it wasn't really sucking and it didn't fix the idle problem. However when I unplugged the plug to the IACV the idle problem stopped immediately. I took it out and cleaned it with carb cleaner but it didn't help at all. I tried the ghetto fix by putting tape over the two holes, which also stops the bad idle, but the car feels like it's about to die every time I stop because the RMP goes really close to 0. Should I just buy a new IACV? Shouldn't that fix this once and for all?

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1992 Honda Prelude Si JDM H22A
| AEM | Competition Cutch | Seibon | KYB | Eibach | Energy Suspension | Buddy Club | Brembo | Hawk | Walbro |

You might want to clean out your FITV (Fast Idle Thermo Valve) first before you buy a new IACV.

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Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer

Alright I did what you said and took out the FITV. I took out the valve part and sprayed it with WD40. The valve was secured well and looked like it was in working order, unlike the stories I've heard where they are completely loose. So I guess it's time to buy a new IACV? :/

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1992 Honda Prelude Si JDM H22A
| AEM | Competition Cutch | Seibon | KYB | Eibach | Energy Suspension | Buddy Club | Brembo | Hawk | Walbro |

That's what I would do.

__________________
Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer

ive got one if you want it

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94 si jdm h22 w/chipped p28
Georgia prelude club member #3
Georgia prelude club website
my ride<----check it out
MY 240 project~~ 300hp here i come

Help a cracka out, buy his sheit.

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Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer

Lol i would but I don't think his is for an H22.

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1992 Honda Prelude Si JDM H22A
| AEM | Competition Cutch | Seibon | KYB | Eibach | Energy Suspension | Buddy Club | Brembo | Hawk | Walbro |

Well no one knew you had an H22 because you didn't state it in your first post (and we don't pay attention to sigs that much :tongue). You can probably find one from an H22 on a forum or E-Bay for a good price.

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Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer

FITV. You're suppose to spin the valve until it's fully tight, no need to clean it..

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1993 Honda Prelude VTEC
-ITS FAST! :p

1 MONTH UNTIL D-Day

RIP Danny (Prid388)

-Atif Hussain

I just wanted to play it safe...like I said it was fully tight anyway.

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1992 Honda Prelude Si JDM H22A
| AEM | Competition Cutch | Seibon | KYB | Eibach | Energy Suspension | Buddy Club | Brembo | Hawk | Walbro |

Problem solved?

__________________
Prelude Enthusiast: [prel-yood, preyl-, prey-lood, pree-lood], [en-thoo-zee-ast, -ist] noun: Someone who is willing to do whatever it takes to push the envelope, performance wise or stylistically, all the while brushing their shoulders off in a truly pimp-esque manor.

See also: Automotive Pioneer

I probably wont get it for at least a week. I'll let you guys know as soon as I get it on the car. :)

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1992 Honda Prelude Si JDM H22A
| AEM | Competition Cutch | Seibon | KYB | Eibach | Energy Suspension | Buddy Club | Brembo | Hawk | Walbro |

so i tried the ghetto fix by putting tape over the 2 holes for the IACV it didnt make a difference, so its probably not the IACV problem. but wen i put my finger to cover the bottom hole of the throttle body it idles normal, so do i need a new throttle body?

well I agree that it probably is not your IACV. I would check your FITV next. Its under the throttle body. A lot of times the valve inside it can come loose, just open it up and make sure is fully tightened.

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1992 Honda Prelude Si JDM H22A
| AEM | Competition Cutch | Seibon | KYB | Eibach | Energy Suspension | Buddy Club | Brembo | Hawk | Walbro |

No you need to either block off your FITV or do a search and you will see how to repair it. That bottom hole is only supposed to be sucking air when your car is cold, once it gets to full operating temp it should be all the way closed.

__________________
1992 Prelude si 4ws H22A swap
WingsWest Big Mouth Kit,Shaved Handles,
emblems, Stock si wheels atm, Tokico Blues,
Tein lowering springs, MSD Cap
and coil, NGK IRIDIUM IX Spark Plugs, NGK Wires,
6000K Hid's,5 speed swap, fidanza 8lb flywheel,
Walbro 190lph fuel pump, Vtec front brakes,
Powerstop drilled/slotted rotors,
Powerstop ceramic pads, 70mm OP Throttle body
Vibrant StreetPower Axleback
1993 Impreza
RIP 1990 Nissan 240SX Coupe w/redtop SR20DET
2007 Subaru Forester
1995 Ford Ranger
!990 Integra DA
1951 Ford Hardtop

ok i will look into my FITV to see it it will fix the prob.

My GF's father figured out my problem, it was my map sensor.

didnt we have a thread called 'the final idle thread'

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