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Powerloss until vtec

 
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Old 10-01-2018, 12:12 AM
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Powerloss until vtec

Hello everyone. Ive been dealing with this issue for about 2 weeks now but my Prelude seems to have lost power around the midrange of the rpm range. At 3k to 5k the car is horribly slow. The exhaust is loud as hell but we're not going anywhere. Once vtec is engaged the car hauls ass like nothing was wrong. Ive tried looking up solutions but have found nothing yet. The only thing ive messed with before this incident would be tightening my alternator belt. Thanks for the help!
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Old 10-01-2018, 12:45 AM
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Re: Powerloss until vtec

Any check engine light?
Have you cleaned the egr ports/valve?
Butterfly valves functioning properly? They are located right between throttle body and intake manifold, make sure hoses are connected to right places.

Poor quality gas?
Check spark plugs condition.
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Old 10-01-2018, 10:22 AM
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Re: Powerloss until vtec

might be time for a tune up
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Old 10-01-2018, 10:46 AM
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Re: Powerloss until vtec

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Originally Posted by emathew View Post
Any check engine light?
Have you cleaned the egr ports/valve?
Butterfly valves functioning properly? They are located right between throttle body and intake manifold, make sure hoses are connected to right places.

Poor quality gas?
Check spark plugs condition.

No check engine light, havent cleaned my egr, and Im not sure about the butterfly valves. How do I test that? Ive looked around for issues with hoses but havent found anything. I dont think its bad gas but Im at half tank, so Ill ride it out and fill up again, I last did spark plugs about a year ago
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Old 10-01-2018, 10:46 AM
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Re: Powerloss until vtec

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Originally Posted by M0B5TA View Post
might be time for a tune up
I did a tune up about a year ago. Ill do another one if you think itll help.
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Old 10-01-2018, 11:06 AM
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Re: Powerloss until vtec

Is your PRELUDE manual or automatic transmission?
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Old 10-01-2018, 11:06 AM
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Re: Powerloss until vtec

If its automatic, there's your problem.
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Old 10-01-2018, 11:33 AM
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Re: Powerloss until vtec

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Originally Posted by emathew View Post
If its automatic, there's your problem.
This one is manual. But it was auto at one point some 15 years ago or something.
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Old 10-01-2018, 06:39 PM
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Re: Powerloss until vtec

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Originally Posted by Clutch_Kicks View Post
This one is manual. But it was auto at one point some 15 years ago or something.
lol

we need more info from you man, post a video or something regarding the issue you are having.
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Old 10-01-2018, 10:29 PM
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Re: Powerloss until vtec

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Originally Posted by emathew View Post
lol

we need more info from you man, post a video or something regarding the issue you are having.
Heh! Im sorry, Im a pretty bad noob at this forum stuff. I can try to make a vid tomorrow and post it up when its brighter out but Ill try to be more descriptive with my words. A little update on the condition, I tried flooring it today just to play with it a bit but there was no acceleration whatsoever. It kinda felt like a bad MAP sensor without the CEL. Once it got to my VTEC engagement point (Which is 5600 due to my VAFC) it hit a dead stop. I couldnt go past 5600 and the stock exhaust is sounding like Im attempting to break the sound barrier while Im not going anywhere. Ill do my best to make a video tomorrow during my lunch.
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Old 10-02-2018, 07:10 AM
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Re: Powerloss until vtec

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Originally Posted by Clutch_Kicks View Post
Heh! Im sorry, Im a pretty bad noob at this forum stuff. I can try to make a vid tomorrow and post it up when its brighter out but Ill try to be more descriptive with my words. A little update on the condition, I tried flooring it today just to play with it a bit but there was no acceleration whatsoever. It kinda felt like a bad MAP sensor without the CEL. Once it got to my VTEC engagement point (Which is 5600 due to my VAFC) it hit a dead stop. I couldnt go past 5600 and the stock exhaust is sounding like Im attempting to break the sound barrier while Im not going anywhere. Ill do my best to make a video tomorrow during my lunch.
what gear were you in?
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Old 10-02-2018, 10:18 AM
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Re: Powerloss until vtec

Could be a simple as a clogged pcv causing vaccum issues. Also check for cracked/leaking vacuum hoses.

How does it idle?

Also could be exhaust valves need adjusting.
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Old 10-02-2018, 11:06 AM
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Re: Powerloss until vtec

I've always heard the VAFC was nothing but trouble. that could possibly be the issue.
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Old 10-02-2018, 11:02 PM
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Re: Powerloss until vtec

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Originally Posted by emathew View Post
what gear were you in?
I was in first gear. I made a new discovery today but unfortunately no video. I changed my vtec to engage past 5600 in an attempt to test if my vtec solenoid is going out. Even with vtec out of the picture my car no longer goes past 5600 rpm. It now feels like Im hitting a limiter because the rpms will bounce off of 5600.
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Old 10-02-2018, 11:07 PM
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Re: Powerloss until vtec

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Originally Posted by bykfixer View Post
Could be a simple as a clogged pcv causing vaccum issues. Also check for cracked/leaking vacuum hoses.

How does it idle?

Also could be exhaust valves need adjusting.
Ill see what I can do about checking my pcv. Ive peeked around my hoses but havent found anything out of the ordinary. Ill do a more in depth check though tomorrow.

Idle is absolute garbage until she warms up. Bounces between 2k and 1k until it warms up. But Ive had that problem before my new 5k rev limit. Ive spent more than a few afternoons contemplating murder while hunting down my idle issue.
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Old 10-02-2018, 11:13 PM
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Re: Powerloss until vtec

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Originally Posted by M0B5TA View Post
I've always heard the VAFC was nothing but trouble. that could possibly be the issue.
Maybe a bit off topic but I had a running joke with my girlfriend that my car hated her because whenever she got into my car it would mysteriously stall out. I found out that she would step on some sort of pressure point on my ecu that would turn off the car. The VAFC was wired terribly but I redid all the wiring with solder.

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Old 10-02-2018, 11:58 PM
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Re: Powerloss until vtec

Mod List if it helps.

Injen Cold air intake.
VAFC
H22a swap
Converted to manual transmission, ECU was soldered to change into a manual ECU
AEM Lightweight pulleys
DC Header
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Old 10-05-2018, 10:01 AM
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Re: Powerloss until vtec

Are you using the original U.S. ECU? I don't know if the JDM ECU runs different timing, but it's a possibility. Bouncing idle is also a symptom of a dirty or bad idle air control valve.
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Old 10-08-2018, 12:20 AM
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Re: Powerloss until vtec

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Originally Posted by Jamie View Post
Are you using the original U.S. ECU? I don't know if the JDM ECU runs different timing, but it's a possibility. Bouncing idle is also a symptom of a dirty or bad idle air control valve.
Yeah it uses the original U.S ecu. I dont think itd be a problem though as it has been running completely fine for a decade on the converted ecu. As for the bouncy idle, Ill try cleaning it tomorrow.
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Old 10-08-2018, 12:24 AM
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Re: Powerloss until vtec

I made a new discovery. The car is hitting a fuel cut at 5500. If I hold it there for a while it cuts fuel out a couple thousand rpms. Anybody know why Id be hitting a rev limiter at 5k?
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Old 10-08-2018, 03:50 AM
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Re: Powerloss until vtec

Phew. This damn car is pissing me off. At this point Ive searched far and wide on Google and have yet to find an answer. Im just gonna post updates on stuff Ive tried in hopes of it helping whatever poor sap this happens to next.

Ive disconnected my VTEC solenoid in hopes of it throwing a CEL. No CEL has popped up and the same 5k limiter persisted. Reconnected everything and used VAFC to lower vtec engagement. VTEC works fine and no limiter once on VTEC. Will try a different vtec solenoid.

Suspected a MAP sensor issue. Replaced MAP with an extra I had. 5k redline persists.

Thought it was ECU since no CEL are present. Disconnected some sensors and CELs popped up so Im not thinking it is ECU.

Suspecting timing but once VTEC engages (Only engages below 5500 rpm) car acts as if nothing is wrong.

Vehicle emitting a burning smell from exhaust, advised that it was possible clogged cat, will update once this has been checked.

TPS Sensor functioning as it should unless VAFC is lying to me. Again.

Discovered loose Rotor in distributor. Missing screw is causing excessive play. Cleaned up points in dizzy cap just for good measure. Will update once screw is replaced. Will try different dizzy.
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Old 10-08-2018, 10:32 PM
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Re: Powerloss until vtec

Tightened rotor and had no effect on 5k limiter. Cleaned up a part that was related to the idle (I forget what its called) my idle is a lot better but 5k limit is still there. I disconnected the Cat but the 5k limiter is still present. Any help would be greatly appreciated. Im starting to run out of things to check. Will check up on timing when I have a free day to crack her open. Will drop more updates as I progress, I hate threads that die with no answer.
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Old 10-09-2018, 09:11 AM
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Re: Powerloss until vtec

Rereading everything, it sounds like you could be stuck on the "high" cam -- in other words, VTEC is engaged all the time (could the solenoid be stuck shut?), and you're seeing poor performance below your switchover point as a result. That might explain your 5000 rpm rev limit, too -- the VTEC pressure switch looks for a change in oil pressure in the line coming off the solenoid...if it doesn't see it, the ECU response might be to cut the fuel.

This is all guesswork...I'm just looking at the functional description in the shop manual and thinking what could go wrong to match your symptoms. But it doesn't look like you've tried a different solenoid yet.
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Old 10-10-2018, 02:18 PM
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Re: Powerloss until vtec

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Originally Posted by Jamie View Post
Rereading everything, it sounds like you could be stuck on the "high" cam -- in other words, VTEC is engaged all the time (could the solenoid be stuck shut?), and you're seeing poor performance below your switchover point as a result. That might explain your 5000 rpm rev limit, too -- the VTEC pressure switch looks for a change in oil pressure in the line coming off the solenoid...if it doesn't see it, the ECU response might be to cut the fuel.

This is all guesswork...I'm just looking at the functional description in the shop manual and thinking what could go wrong to match your symptoms. But it doesn't look like you've tried a different solenoid yet.
I can use my VAFC to lower my VTEC engagement point below the fuel cut. If I put it around 4k I can still feel the car change to high cam and it passes the fuel cut point with minor hesitation. I want to try a different solenoid and Ill get around to it on Friday. Once I disconnect the VTEC solenoid and try to engage VTEC nothing happens but I dont get a CEL.
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Old 10-10-2018, 04:54 PM
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Re: Powerloss until vtec

try a valve adjustment
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Old 11-10-2018, 12:16 AM
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Re: Powerloss until vtec

Some way. Soooome way. SOME WAY! This thing was running 5 teeth off on timing. It was running fine and somehow some way jumped 5 teeth or I put it in there like a dumbass. Anyway thank you all for your help. Problem solved.
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Old 11-10-2018, 02:36 AM
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Re: Powerloss until vtec

I saw that there was an update on this thread...I was about to tell you to just sell the lude and buy a mustang to make up for the loss of power lol. glad you figured it out. Let's see the whip man! post pics.
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Old 11-18-2018, 12:55 AM
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Re: Powerloss until vtec

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I saw that there was an update on this thread...I was about to tell you to just sell the lude and buy a mustang to make up for the loss of power lol. glad you figured it out. Let's see the whip man! post pics.
She isnt much but I inherited her from another member here.
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Old 11-18-2018, 08:41 PM
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Re: Powerloss until vtec

I have no idea who the "another member here" is, but your lude looks like "one of a kind" never seen that kind of body kit before. I like the paint color and wheels look cool.
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