AccordSleeperZzZ

vehicle: 95 accord ex
engine: f22b1

yea, i know, another VTEC thread. i apologize. i swear its not a "which cylinder is the vtec cylinder?" question tho.

i rarely rev my engine past around 3k when driving under normal conditions because i'm cheap and try to get as good gas mileage as possible. but, sometimes when i do rev it higher to the point of vtec engagement it doesn't always engage / stay engaged. one can definately feel it jump between being engaged and not, too. i'm not sure what it would be. i thought, maybe i'm just a little low on oil(a common problem from what i hear), so i put a quart in, but to no avail. i'm not sure if the solenoid would be bad. i really don't know.

anyone know what i should check? any help?

here's a random pic of the engine, because people are more prone to look at threads with pictures. hah.




thanks,
-Chris

The-Kid

Well in a SOHC, it is really hard to feel or hear VTEC kick in. In a DOHC, it is more often you can hear it. On some motors, the VTEC engagement can vary.

5G_Vtec

I have a 95 Accord Ex VTEC F22B1 also and I can't feel my VTEC kick in at all or maybe it's that I just don't notice it kicking in.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by The-Kid &raquo;</TD></TR><TR><TD CLASS="quote">Well in a SOHC, it is really hard to feel or hear VTEC kick in. In a DOHC, it is more often. On some motors, the VTEC engagement can vary.
</TD></TR></TABLE>

Maybe that's why I can't feel it kick in since mine is SOHC not DOHC.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AccordSleeperZzZ &raquo;</TD></TR><TR><TD CLASS="quote">...i'm not sure if the solenoid would be bad...</TD></TR></TABLE>

Deffinitely hope it's not that.

Twixle

It could be a bad solenoid, possible. But not likely if it's still engaging. VTEC is not based solely on RPMs. There are about five different sensors that the ECU takes readings from in order to tell if VTEC should engage or not. So if you're feathering it around 5K I would expect it to kick in and out as the engine conditions change. However, if you're sticking your right foot into the floor to up near redline and it's still switching in and out, then I might suspect something else is wrong.

AccordSleeperZzZ

yea, i hope its not the solenoid. and as for feeling it, its more that you can feel it when ever you're accellerating and it kicks in then after a little while it disengages. thats what you can feel. ugg. i dunno.

Twixle

I've found that I get the same gas mileage no matter how I drive my accord. How big of a difference have you observered?

AccordSleeperZzZ

depends if its highway or city driving. last tank of city driving i was pissed at my girlfriend and drove pertty hard for a while it cut about 20 miles off of my average miles per tank.

Twixle

How many miles/tank do you usually get? I usually fill up at 300, don't like to run it into the E, but I can get 350+ if I do.

AccordSleeperZzZ

about 350.

silentrg03

When your vtec disengages are you at full throttle or letting off...the ecu will extend vtec engagement to a certain RPM due to throttle position as for a b18c1 vtec is at 4400 RPM at full throttle but if you have half or less throttle the ecu will extend the crossover to about 5000k RPM for cruising at 80mph

xluben

i have a 6th gen 4cyl (f23a4), and i originally thought vtec kicked in at 4-4.5k

then i put in a vtec light and did some reading on here and found (and confirmed) that it comes on MUCH sooner (as low as 2300).

https://honda-tech.com/zerothread?id=1869866

i think what i actually thought was vtec engaging was just a peak in the torque curve:

https://honda-tech.com/zerothread/1852757

i've got a couple other threads on my thoughts on "feeling" torque:

http://www.6thgenaccord.com/fo...=5161

http://www.6thgenaccord.com/fo...=5452

could that be it?

philadd

I'm assuming your check engine light is not on?

You can always start by making sure the screen on the solenoid isn't clogged...

AccordSleeperZzZ

when it lets off, i still have the throttle pegged. =/

i'll check out your threads. yea, i know vtec depends on 4 or 5 different factors, but i've heard it generally kicks in around 5k on my/this particular engine.


no, the check engine light isn't on. i'll check to make sure the solenoid isn't clogged sometime soon. 20degrees minus a windchill makes it difficult for me to find the motivation to do much work outside(no garage up here at school).

thanks for all the input, duders!

xluben

i haven't done much research on your engine, but for a single cam motor, i'd think it would be MUCH lower than 5k.

vtec in a SOHC engine is more for fuel efficiency (maximize low end torque) rather than all out power (like in a DOHC engine trying to get max torque).

if you look over one of my threads i could definitely "feel" the torque curve drop off. even when i had it pinned until redline, it would feel like i let off around 4.5-5k

maybe just hook up a discreet (unless you want to mount it) vtec indicator, so you can verify that it's actually turning on/off when you think it is.

hondadude

There is more to V-tec engagement than RPM;

AccordSleeperZzZ

1st off - thanks for all the input, guys. it helped a bunch.


i'm gonna take a look at my solenoid sometime this week when its supposed to be in the 60's. if its clogged, i'll try and clean it out or something.

i mean, its an accord so i know its no race car so this isn't the biggest deal. just trying to get everything to work right.

thanks everyone.

gianinline

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AccordSleeperZzZ &raquo;</TD></TR><TR><TD CLASS="quote">here's a random pic of the engine, because people are more prone to look at threads with pictures. hah.




thanks,
-Chris</TD></TR></TABLE>

yup... it's true....

AccordSleeperZzZ

oh, and xluben, i did read your threads. they were quite informative.