"té_qui" wrote:

<snip>

> >> Need people's expertise here. I have a 92 VX with the VTEC-E. I'm having
> >> problems with something I have yet to discover. My question is ... In my
> >> quest for the search of my problem, is there a way to manually activate
> >> the
> >> VTEC to always be on. Right now, The VTEC-E is set to activate at about
> >> 2500-3000RPM. My problem is that below these RPM, I get very low
> >> performance
> >> but as soon as I hit 3000RPM, the VTEC or whatever kicks in very hard to
> >> scream down the road. So I'm basically trying to see if it's the VTEC not
> >> properly engaging itself or if it is something else. If I unplug the VTEC
> >> spool valve or the pressure switch, don't remember which, I pretty much
> >> solve

> > Now, in the
> > troubleshooting section it say to apply battery voltage to the GRN/WHT
> > terminal to open up the VTEC Solenoid valve. My interpretation is that
> > you should remove the 1-pin connector from the VTEC Solenoid Valve and
> > apply battery voltage directly to the pin on valve.
>
> I got to do what you mention, connect 12V via a switch and with that I was
> able to recreate my symptoms. Driving with VTEC off is smooth all the way to
> about 4500-5000rpm at which point I have not much power left. That's o.k.
> However, activating the VTEC at 2500rpm almost stall the engine at first but
> it picks right up after 3500rpm and accelerates fast to 6000+rpm.. If
> activating at 5000rpm, almost feels like a common VTEC found in civic SI.
> So the VTEC solenoid valve is probably not my problem. Maybe the pressure
> switch is, or maybe a clogged solenoid valve filter. If I activate the VTEC
> at cold, it reduces engine speed.(Does engine have high pressure when cold
> idling?) When warm, no effect at idle(Is there little if no pressure when
> idling warm?). Thus, since my hesitations or loss of power occurred at
> around 2500rpm but than kicked in power at 3000rpm, I would presume I might
> have a pressure related problem. Like you said, I'm probably having a VTEC
> engaging trouble. Pressure might be too little at 2500-rpm to activate VTEC
> but high enough at 3000=rpm. What do you think of this? Would you have any
> other suggestions or probable solutions? anyone welcomed.
> thanks for the great help
> Frank

At this point I would get an oil pressure gauge and measure the oil
pressure. The service manual for 1994 lists minimum pressure at idle as
10 psi // 0.7 kg / cm^2 // 70 kPa. At 3000 RPM the minimum is 50 psi //
3.5 kg / cm^2 // 350 kPa. All numbers apply to warmed up engine. The
service manual says to connect the oil pressure gauge in place of the
oil pressure switch above the oil filter (NOT the VTEC pressure
switch!).