thisboyjulio

I have a question about my 94 civic ex ... Should my civic be able too go to 7200 rpm .... because my redline is at 7200 but it only go to 5000 and it goes no more than that but i have a 94 civic ex vtec. what do you think the problem is

SOL Food

yes it should be able to go up to 7200rpm.

please clarify what you mean by it "only goes to 5K"?

BauleyCivic

Any check engine lights or anything like that?

thisboyjulio

like what i mean when I say it only goes too 5000 rpm i mean like when i go 5000 rpm its sound like the engine is gonna blow like I reached the redline point in it or someting .. there is no check engine lights on when i go to 5000 rpm is gives that jerk like u redlining it.

SOL Food

do you know if you're using the stock p28 ECU or if it's chipped/modified?

thisboyjulio

The car is fully stock ... i need too check the thing about the ecu ill get back too you about that one tommarow.

JDMKid71

what does the tach read when the engine is at idle.. say like at a stoplight...? the only thing i can think of is the gauge isnt reading correctly.

thisboyjulio

well the car idle low and it reads right. everything looks ok too me ... the car is quiet i just ran it jus too see if im mistaking but when i reach about 4000 rpm the motor sounds like its redlining hard .... i cant reach 7200 imma have too check the ecu. maybe thats not a vtec ecu.

Syndacate

true, it might not be an ECU, he said the car's completely stock, a P28 chip if I remember correctly is an upgrade chip, a plugin ECU, that's not stock. It really sounds like the v-tech system isn't working though, do you hear it go into the v-tech power band thing?

SOL Food

^^that could the other reason...like it wants to go to VTEC but it can't.

74celicagt

a past car of mine had a clogged/broken up/bad catalytic converter and had the symptoms that you're describing.


how many miles and does your engine burn oil?

Eaglekper0046

iTrader: (2)

since the car like you said is stock your not going to hear vtec. Removed the factory intake pipe and drive the car to your redline and see if it hits vtec. It should engage at 5k. If your reading your tach and your hear engage before 5k, then you found your problem, the tach. If it doesnt work at then its your ecu.

VRD^sam

that sucks dude

RTI

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Syndacate &raquo;</TD></TR><TR><TD CLASS="quote">true, it might not be an ECU, he said the car's completely stock, a P28 chip if I remember correctly is an upgrade chip, a plugin ECU, that's not stock. It really sounds like the v-tech system isn't working though, do you hear it go into the v-tech power band thing?</TD></TR></TABLE>

a P28 is not an upgrade unless it has been chipped. Like others have said, vtec is difficult to hear on a sohc motor. I would guess the tach is reading wrong. they have been known to be inaccurate at high rpm. How do you know your tach is reading correctly?

Everyones Hero

Make sure your car has a P28. Check to see how much oil is in the car. Without oil the VTEC solinoid cannot open, thus rendering the almighty VTEC useless.

Strange that the car won't go above 5000rpm.

Is it that the car won't go any further than 5k or is it that YOU don't feel comfortable taking the car above 5k?

IHateJDM

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 74celicagt &raquo;</TD></TR><TR><TD CLASS="quote">a past car of mine had a clogged/broken up/bad catalytic converter and had the symptoms that you're describing.


how many miles and does your engine burn oil?</TD></TR></TABLE>

very possible. a clogged cat will restrict exhaust flow at higher rpms, and the motor can only take in as much air as it can push out.

OP, when you hit 5k, does it feel like your rpms hit a wall and the tach bounces down a few hundred rpms then back up, or does the tach gradually slow down and hold at 5k?