youre probably just getting used to it.

 

Mine only does that if my engine isn't warmed up. It needs at least 3 bars on the engine thermostat for vtec to kick in.

 

Engine was fully warmed up. I would like to think that I'm not getting used to it. Maybe it's that part of my brain that is begging for a turbo... but I don't know.

 

You are out of oil. Also it might be time for a valve adjustment.

 

Out of oil? I just changed my oil ~500 miles ago. Mobile 1 5w-30. Put in 5 quarts.

 

Wait did you just say 5 quarts....dude our cars only take 4.25 quarts.....


Also you need to check your clutch, it may be slipping. Like someone said, if there is no cell there is not issue. 57K miles, if you drive it hard your clutch maybe going out. Check that first.

Next oil change please use 4.25 quarts, 5 is too much.:readtherules:

 

i am having the exact same problem right now with my car..dont believe people wen they say "its just in your head" . i think you would no your cars power by now..everyone kept telling me that it was in my head until i took it to the dyno and found out i lost 57 whp! its been like 3 weeks now and i still cant figure out whats going on with my car and ive tried alot alot of things

 

57 whp!? Sweet jesus... an lx could pull on you then... yeah, I'm hoping that's not the case with mine... I'm thinking maybe I have a cracked block? I'm not sure if that would cause it? I also thought maybe my air intake was clogged, but I checked the filter, and it doesn't look too bad. I called the Honda dealership, and they said they couldn't do anything if there wasn't a CEL. Maybe I could convince a service tech to ride with me in the car, and experience it first hand... I don't know...

 

Siem!

...found this..
http://www.8thcivic.com/forums/civic-si/150696-reduced-rev-limit-2.html#post5253943
Click Me!

 

...found this..
http://www.8thcivic.com/forums/civic-si/150696-reduced-rev-limit-2.html#post5253943
Click Me!

Thanks man! I'll have to check my part out after work and see if it's collapsing! Hopefully it's just that and I get it fixed rather easily! I really appreciate it! :thumb:

 

yeah dude..i put down like 161 at the wheel? dunno how or why yet..i took mine to honda and they said they couldnt work on it cause theres to many aftermarket parts..so i guess im on my own..but i was in a 4th gear pull and then like it switched over and started running like poop..when did yours happen?

 

In actuality, that's not that bad of a whp loss. Most civics should put down 197 at the crank, but at the wheels, they are going to be putting down between 170 - 180ish... so you're just a little bit lower... then again, depending on how many aftermarket parts you have on the engine, then i can't say for sure. Mine is happening as soon as I hit the engagement revs. Like when you drive with a cold engine, the cams won't switch over if your car isn't warmed up enough, that is how it feels, but my car is fully warmed up.

 

I really hope that helps!

hope to meet you at the Meet!

 

Possibly a dirty MAF. Good luck with the fix and post back if you ever solve it. Seems like a few people have had this problem, but not too many have posted back a solution.


Here's one possibility.
http://www.8thcivic.com/forums/mech...-problems-technical-chat/129909-powerloss-over-4000-rpms-whether-wot-not-3.html

 

yeah i no..ive tried cleaning my MAF but nothing happend...and as far as power i used to put down 209whp with all my mods so putting down 161whp this time is def. a big loss..it just blows my mind that no one has ever had this problem before to know the solution

 

Check out that link by posted by cweber. If you don't have an A/F ratio gauge, you probably wouldn't know. I checked my rubber sleeve, and it seems a little weak, like it might be collapsing, but without having someone else rev the engine, I won't know for sure.

 

welcome to the club i have the same issue i put down 181whp on my first two pulls then 131whp...my vtec seems to do the same thing after 3rd gear or during 3rd gear and then throughout the rest of the gears....if i let it cool down though it works again for a bit.

 

i actually have an an gauge..my afrs are perfect..i really dont no wat it could be ..ive tried alot of things already nothing worked

 

I wonder how many other people are having this issue? Maybe they stuck an r18 in our cars and said it was a k20...

 

seriously though i was beating my buddies gto ans srt4 and now they walk me all day

 

OK !!! come on now , before i felt for your problems , now i call:bsflag:
I have a legit 237 whp and will still let everyone know that an srt4 or a gto will walk me like a doggie .. the only way you were gonna have bragging rights to either one of those cars would be in the twisties.

now to help with what could be your problem , a bad pcv valve can cause this , it may not throw a cell for a while just due to the car not reading it as blow by oil pressure problem, also the oil pumps on the z3 are not the most desirerable, mine was changed out for an a2 oil pump and i monitor it with a temp and pressure gauge. my stock z3 pump would go between 40 psi down to 20 at idle and under load between 65 to 100 psi and then shoot back down to 70 during the vtec engagement causing a dead spot, more or less the stock pump could'nt keep up and made it feel like a power loss..

the rise in the oil pres is what activates the cam to drop and lope into the vtec engagement, which is also why a catch can should be used off the pcv valve more so than the valve cover..

 

mine only seems to happen when i get on teh car hard, otherwise a random vtec here or there its fine but once i start pounding on the gears its bad.

Question, does your guys get really loud? like sounding different then normal when this happens?

 

yes wen vtec kicks in it starts getting really loud..its like twice of wat it used to be

 

Does it sound like the regular engine noise, only louder, or does it sound different?

 

Your not using 87 octane fuel by chance are you?

Does everyone who is having this happen have Hondata reflash?

Has anybody hooked up a scan tool and driven it to v-tec to see if anything looks off?

 

I know you just changed your oil, but have you checked the oil level? The big cams won't switch over if there isn't enough oil pressure which sometimes can happen when low on oil. Please check. I've seen this happen before.

 

no i def. only use 91 and up...mostly 93..and i have a scan gauge constantly reading my car and its coming up with nothing..and yeah i have the reflash..i even called hondata and they said there is absolutley no way the reflash went bad..i have enough oil ..i even have a oil pressure gauge in my car to monitor it and its the same as when it used to run good....

the motor seems like its screaming.but making no power...its really wierd actually..its so loud you like cant hear the radio if you get on it hard

 

Does your scan gauge show live data or just of there are any codes? Does it show TPS status, v-tec status, number of misfires, etc.? Just wondering if anything isn't reading properly.

If it's louder that makes me think there may be a mechanical issue. Maybe a valvetrain issue, maybe an intake or exhaust manifold leak, something that could make more noise.

Your clutch isn't slipping right?

I know you said that Hondata assures you that the reflash isn't causing the issue, I'm just looking for a common denominator.

 

Perhaps the solenoid for your vtec engagement is dead. Also, I once tried taking off the cold air snorkle on my car, it had way less power at vtec. So if you have a SRI that might be the problem.

 

yeah it does show some live data..it shows tps status..not vtec or misfires..i just put new plugs in though so it cant be the plugs ...the thing that boggles my mind is when i put the stock intake box on the motor doesnt get like super loud like it does now but it feels like a turd with no power at all..now that i have my DIY X intake on it gets loud..ive tried like 3 different intakes on the car..nothing seems to be working