Maybe your EGR valve is extremely clogged? Does it throw any check engine lights?

 

VTEC doesn't engage when it's low on oil.

I know that VTEC engagement on the i4 is something like 4500 or 4800.

 

But the engine would still rev past that point.

 

it has a CHECK ENGINE and it has the VTEC SOLENOID but i changed it? and it still does that.

 

Yeah, I think the problem is that your oil pressure is low. If so, VTEC will not engage and you won't be able to rev past that point
Not really, on the I4 if VTEC engages around 4900RPM's that's when it switches to the higher lobe which demands more oil pressure. But if your car is low on oil, it won't switch over and VTEC will not engage. Thus, the reason of not revving past 4900RPMs in park or a drive gear

 

...the engine will stay on the low cam if the oil pressure is low. The neutral rev limiter has nothing to do with oil pressure, I already explained why that's there. That's totally seperate, enough of that.

Haven't you ever driven your car when it's cold and needed to swing the tach up to get out of a tricky situation? The engine just doesn't hit VTEC engagement point and stop, it just stays on the low cam and it feels gutless.

 

Well, according to my experience and not something I've read, my car (along with others I know) will not rev past 4900RPM's with a low oil pressure. It's happened to me twice since I've had to car.
I would have thought there was a problem with my car, but I doubt it if other people with F23A and J30A1 motors have experienced the same problem

 

Oh. I've never had low oil pressure, so maybe I'll try draining some out this weekend and testing it My point is that just because VTEC isn't engaging doesn't mean the engine won't rev past that point, at least on the J30A1. I guess if the oil pressure was low then maybe the ECU wouldn't allow it. I'd like to hear if moo found checked his oil yet??

 

how can u check your oil pressure? or do i have to take it to a HONDA DEALER?

thanx, 98CoupeV6

 

Check your oil, that's the only thing that would cause abnormal pressure aside from a bad oil pump I think. And you'd know if you had a bad oil pump. If your oil pressure was really low though your light would come on...

So the car still will not rev past a certain point in the rev range when it's warmed up? Does it just STOP like you've hit the fuel cut off? Maybe the ECU is bad or something, that's weird.