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Old 01-25-2009, 05:35 PM
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Icon5 (__Power loss issue__)

Ok, after beating a dead horse for a really long time, and not getting anywhere. I think I may have a lead to my low end power loss/torque issue.

I've checked almost every thing under the sun. From basic/simple tuning problems, vacuum, dizzy, ecm, electrical, fuel system pressure, egr system, exhaust, intake, O2, KS, etc. etc. and I haven't found a problem with why my car has seemed like it's pulling a f#@$ing trailer in 1st through 3rd.

I was almost convenced that it was all in my mind, and I just happend to by one of the slowest preludes out there....Untill know. GOD, I hope this is the problem, I'm so sick of looking for that needle in the haystack.

I.A.B (Intake Air Bypass)

My flapper valves, are in the stuck open position, at idol, and all of the time.

I have no vacuum going to the throttle control valve, that should be keeping the flappers closed until 4000+rpm.

Has anyone experienced this problem? Could this be a cure for my low end torque issue? I've checked the #13 line going to the plastic box under the intake, and it's connected, and looks fine. But I'm under the assumption that it could be the box, or an electrical problem pertaining too.

If any of you have an advice for me on this subject, please help.

Thanks guys,
-Shadow-:beerglass:
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Old 01-25-2009, 05:42 PM
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Re: (__Power loss issue__)

OMG...I have this exact same problem...I have been trying to figure it out for fckin AGES....at first i thought it might be a/f ratio / compression / valve train related..but now you mention it!!!!! i even went to the dyno and had it tested and it came out 40hp lower than normal..i put up a thread on here asking for advice but no-one was able to give me any answers.

I usually can top out at 155 mph but now my car struggles to get to 130mph..this may well be the problem..how long have you had this issue and have you tried rectifying it yet?
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Old 01-25-2009, 07:47 PM
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Re: (__Power loss issue__)

can you (or anyone else on the forum) get pics of the Intake air bypass valve or where its located?
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Old 01-25-2009, 08:46 PM
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Re: (__Power loss issue__)

nahh, stuck open IAB's shouldn't affect your acceleration THAT much.

the IAB's are in a plate in the intake manifold, under the plenum and before the runners. there's one per cylinder. this is what they look like:

[IMG]http://i9.photobucket.com/albums/a56/esedulerp5tenin/for%20sale%20****/P3080456.jpg[/IMG]

dammit. replace the ****'s with "s h i t"



have you guys done compression/leakdown tests? just getting the obvious questions outta the way...
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Old 01-26-2009, 02:30 AM
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Re: (__Power loss issue__)

Nick...check the manual, the flapper valves should stay closed until 4000-4800 rpm. right? Giving more low end torque where it's needed, then the valves open to accomodate more air at a higher rpm. IDK???
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Old 01-26-2009, 06:18 AM
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Re: (__Power loss issue__)

if they are in the intake manifold then im not really fussed as i plan on upgrading with a new skunk2 pro intake manifold..but its still a pain in the ass..i got little punk ass kids in civics making me look slow
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Old 01-26-2009, 03:01 PM
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Re: (__Power loss issue__)

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Originally Posted by shadow29485 View Post
Nick...check the manual, the flapper valves should stay closed until 4000-4800 rpm. right? Giving more low end torque where it's needed, then the valves open to accomodate more air at a higher rpm. IDK???
is it a PITA to change or fix?
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Old 01-26-2009, 03:16 PM
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Re: (__Power loss issue__)

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i got little punk ass kids in civics making me look slow
wow, so are you losing power at your high end top or acceleration
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Old 01-26-2009, 03:21 PM
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Re: (__Power loss issue__)

in low end tq, acceleration and top end, the whole car overall just seems slow as hell
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Old 01-27-2009, 01:20 AM
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Re: (__Power loss issue__)

Have you checked your timing on the dizzy?
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Old 01-27-2009, 10:32 AM
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Re: (__Power loss issue__)

damn neil, that would be great if that was your problem then you can finally get that beast running like it should be..

oh i still have those filters for you but i've been busy as hell
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Old 01-27-2009, 11:59 AM
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Re: (__Power loss issue__)

i finally found out what the problem was..i was cleaning my k&n panel filter today and just checking under the hood to make sure everything was ok when i realised the throttle cable was looking a little slack..well i tightened it up and took it for a test drive and miraculously it was sorted...my power and acceleration is back..it wasnt the IAB valve but the throttle cable..
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Old 01-27-2009, 12:08 PM
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Re: (__Power loss issue__)

If you want you IAB's to still somewhat function... Just 'T' into any vac line coming from you Intake Manifold and run it to the actuator for the IAB's.

That's how I make use of mine. With a p28 theres no IAB control, because there IS an electrical circuit for it in p13, p14, and p72 ECU's.... Well now my IAB's are functioning solely off vacuum. At more than half throttle my IAB's are opened.
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Old 01-27-2009, 06:48 PM
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Re: (__Power loss issue__)

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Originally Posted by 91Si4WS View Post
damn neil, that would be great if that was your problem then you can finally get that beast running like it should be..

oh i still have those filters for you but i've been busy as hell
"J",
Yeah, I'm hoping so. I didn't want to bug you about the filters since school has started back. Thats cool, let me know when you work again, if you could bring them then that would be cool.
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Old 01-27-2009, 06:58 PM
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Re: (__Power loss issue__)

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Originally Posted by ShoofIsLudin View Post
If you want you IAB's to still somewhat function... Just 'T' into any vac line coming from you Intake Manifold and run it to the actuator for the IAB's.

That's how I make use of mine. With a p28 theres no IAB control, because there IS an electrical circuit for it in p13, p14, and p72 ECU's.... Well now my IAB's are functioning solely off vacuum. At more than half throttle my IAB's are opened.
Did you have ****ty pick up from 1st through 3rd? Also, if I 'T'd in to another vacuum line wouldn't the valves NOT open at a higher rpm, because it has a constant pull of vacuum keeping them shut?

I'm not sure if this is the problem or not, but it would be great if it was.

The clutch is not slipping. Like R8 mentioned above, it's a little dissapointing when you get beat by a civic because of no low end torque.

Could it be the TPS? If anyone has any advice on what it could be, please ping in.
Thanks
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Old 01-27-2009, 07:34 PM
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Re: (__Power loss issue__)

its easy to check..just pull on ur throttle cable with ur finger and if its loose just tighten it up with the two nuts on there!!
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Old 01-28-2009, 01:39 AM
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Re: (__Power loss issue__)

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Originally Posted by R8GYY View Post
its easy to check..just pull on ur throttle cable with ur finger and if its loose just tighten it up with the two nuts on there!!

I was talking about the vacuum.... pertaining too the 'iab' inside the intake/plenium. Not the throttle cable.

I wish it were that simple.
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Old 01-28-2009, 06:23 PM
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Re: (__Power loss issue__)

Nope. I T'd into a vacuum line, and the flappers closed, but still hasn't done a damn thing for my piece of ****, slow ass car!
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Old 01-30-2009, 10:13 PM
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Re: (__Power loss issue__)

I screwed with the IAT sensor (took it out of the IM). And the engine ran much cooler, also had a good bit of pick up. Then it started to loose power, the more and more I drove it.

It's obvious that heat, is playing a major role in my lower rpm range.

Any ideas, on cooling the engine/intake, other than coolant or running colder plugs?
I've done both. Oh, also all fuel lines are wrapped.

Later,
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Old 02-16-2009, 07:38 PM
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Re: (__Power loss issue__)

bump....I have a similar issue with my 5th gen where when hot it runs slow as **** in the lower RPMs...shadow hows your vtec does it still engage as it should?
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Old 02-16-2009, 08:23 PM
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Re: (__Power loss issue__)

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bump....I have a similar issue with my 5th gen where when hot it runs slow as **** in the lower RPMs...shadow hows your vtec does it still engage as it should?

No vtec.
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