es_squared

damn..now i think my vtec is messed up after rewading all this lol. k when exactly does vtec kick in and can feel it? 4200 ? gota test this out cuz i think it comes in a bit late

Schmitey

good god kids who gives a ****...as long as it works

VSS vs tach vs speed you're all right. If the sensor didn't mattor they wouldn't have it. Nuf said.

prelittlelude

back from the dead, more info added, hope it helps

5ltreater

please help read thread

Ok checked oil pressure, and oil level...vtec kicks fine at about 5-6 but then at about 8 it starts to go in and out like spasms, kinda like hittin rev limtr but thts set at 9.9 not sure whats going on but its crazy in need of some good old help......

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5ltreater &raquo;</TD></TR><TR><TD CLASS="quote">please help read thread

Ok checked oil pressure, and oil level...vtec kicks fine at about 5-6 but then at about 8 it starts to go in and out like spasms, kinda like hittin rev limtr but thts set at 9.9 not sure whats going on but its crazy in need of some good old help......</TD></TR></TABLE>

firs tstart by telling me what kind of car we are talking about, and have you TRIED or INVESTIGATED EVERYTHING i talked about on the first page? you need to give me more info, i can't jsut hand you an answer

swappedcivic

iam having the same problem but at 6400 is when it spasms. sometimes it even cuts out completly and the car has to drop out of vtec before i can go again. After that it wont go into vtec unless i turn off the car.I have a 96 civic with and h22 with a p72 ecu. Can you help?

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swappedcivic &raquo;</TD></TR><TR><TD CLASS="quote">iam having the same problem but at 6400 is when it spasms. sometimes it even cuts out completly and the car has to drop out of vtec before i can go again. After that it wont go into vtec unless i turn off the car.I have a 96 civic with and h22 with a p72 ecu. Can you help?</TD></TR></TABLE>

is your ecu chipped or is it a stock p72 , if its stock then vtec is engauging at 4400

start by telling me what you have tried out of all the things i listed.

swappedcivic

Its a stock p72, i have a vtec controller hooked up also. I have unhooked it and there is no vtec at all. oil levels are fine. pressure is fine. all fuel is fine.the only code Iam throwing is 6 which is coolant temp. It has been replaced. and it still throws a code. wires seem to be fine. scan tool says it has high input(coolant temp). I tried another ecu and it didnt help. One other thing I noticed was that vtec would engage when I was stopped and I revved the car up. I know its not suppse to do that. I tried things u have posted and still cant figure it out. I do know most things about the damn car. I have only been doing this for like 7 years but this one has me stumped.

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by swappedcivic &raquo;</TD></TR><TR><TD CLASS="quote">Its a stock p72, i have a vtec controller hooked up also. I have unhooked it and there is no vtec at all. oil levels are fine. pressure is fine. all fuel is fine.the only code Iam throwing is 6 which is coolant temp. It has been replaced. and it still throws a code. wires seem to be fine. scan tool says it has high input(coolant temp). I tried another ecu and it didnt help. One other thing I noticed was that vtec would engage when I was stopped and I revved the car up. I know its not suppse to do that. I tried things u have posted and still cant figure it out. I do know most things about the damn car. I have only been doing this for like 7 years but this one has me stumped. </TD></TR></TABLE>

the reason the car hits vtec when your stopped is the vtec contorller,

firs tthing i would do is try and get rid of the coolant temp problem. I know vtec has a lower bound coolant requirement but not sure if it also has an uper bound coolant limit. the car may very well be hitting vtec but the ecu is imposing a 6500k rev limit to protect it self.

if you have a friend with a gsr ask them to plug your ecu in and drive the car around and if it doesn't give the coolant code then you know its wiring some where.

i belive your problem lies with the check engine light. you HAVE to get rid of that first.

DCFIVER

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelittlelude &raquo;</TD></TR><TR><TD CLASS="quote">

is your ecu chipped or is it a stock p72 , if its stock then vtec is engauging at 4400

start by telling me what you have tried out of all the things i listed.</TD></TR></TABLE>

Gsr vtec engagement is at 5800.

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cb7-R &raquo;</TD></TR><TR><TD CLASS="quote">

Gsr vtec engagement is at 5800.</TD></TR></TABLE>

no thats a common mis conception, the IABS on the gsr open up at 5800, and vtec engauges at 4400, maybe your thinking of the type r which has vtec at 5700

swappedcivic

thanks ill try to get rid of it but I cant trace the problem

5ltreater

yeah i fig. out my problem, i went back and checked all lines and wires and there was something loose and thats all it was thank god. its good to double check or even triple check everything cause chances are you might miss something.

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 5ltreater &raquo;</TD></TR><TR><TD CLASS="quote">yeah i fig. out my problem, i went back and checked all lines and wires and there was something loose and thats all it was thank god. its good to double check or even triple check everything cause chances are you might miss something. </TD></TR></TABLE>

exactly, like i said, check your wiring 40 thousand times to be absolutl sure

DCFIVER

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelittlelude &raquo;</TD></TR><TR><TD CLASS="quote">

no thats a common mis conception, the IABS on the gsr open up at 5800, and vtec engauges at 4400, maybe your thinking of the type r which has vtec at 5700</TD></TR></TABLE>

No it's not a misconception. 4400 rpms is the butterfly engagement and 5800 is VTEC engagement. I have plenty of freinds with geezers and I also had an untuned p72 on my motor for 3 months. On my h22 VTEC came on laaaaaate.

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cb7-R &raquo;</TD></TR><TR><TD CLASS="quote">

No it's not a misconception. 4400 rpms is the butterfly engagement and 5800 is VTEC engagement. I have plenty of freinds with geezers and I also had an untuned p72 on my motor for 3 months. On my h22 VTEC came on laaaaaate.</TD></TR></TABLE>

acctually your wrong

the secondaryies on the p72 opened up late and thats why the car lagged it was starrved for air flow

and why don't you pm this mod that has more than 11 thousand posts and tell him he is wrong about the rpm of vtec / IABS ---&gt; https://honda-tech.com/zero...65731

Stoich EG2

this should be stickied

lventre

Hello Prelittlelude... you maybe are my salvation.. My name is Luis and im from argentina. I have a prelude 2.2 vtec 2 month ago. And you can figure it out my vtec doesnt workk..... but it exactly sometimes make a cut at aprox 6000 rpm, sometimes it pass 7000 rpm but seems to be weak and the less times it goes to 7800 rpm really good. I really dont know and dont really understand about the limp mode but doesnt mather.....
I tried almost all thing that you listed, i have checked all electrical, i have helms manuals, i have checked the solenoid and the switch, i have cheked the oil level but i dont know if the oil press its o.k. My car throw a 22 code. VTEC OIL PRESSURE SWITCH, but i dont know what could be, my car when its cold it has 65 psi...when warm up iddle has 50 psi, but when i go out and check around 6000 rpm the pressure its not higher than 35-40psi? I wanna be sure that its the oil pump before i take out everithing. Have you any ideas? I will really help because i dont know why the car sometimes make a intermitent fail at 6500 rpm or sometimes make a draticall cut at 6000 aprox...... THANKS FOR ALL.
Feel free to email me...

lventre

Excuse i was forgetting something when i bought my lude, it has only one fan, and the small a/c fan doesnt have, so maybe the coolant temperature sometimes its wrong? what do you think? dont forget that the 2 fans work togheter from factory and in my lude its only one.....THANKS FOR ALL

SKDRCR

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lventre &raquo;</TD></TR><TR><TD CLASS="quote">Excuse i was forgetting something when i bought my lude, it has only one fan, and the small a/c fan doesnt have, so maybe the coolant temperature sometimes its wrong? what do you think? dont forget that the 2 fans work togheter from factory and in my lude its only one.....THANKS FOR ALL </TD></TR></TABLE>

The other fan is strictly for the a/c I believe.
I'm running only on fan and have no cooling or vtec issues.

xd69

iTrader: (1)

but if the ecu doesn't have a tach reference , then how is it going to know when you reach proper rpm.. exactly


you can just hook up a vtec light to let you know when vtec is engaging. that's what i did to my h22dx swap without tachometer...works great!

Monkey Fing a Coconut

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xd69 &raquo;</TD></TR><TR><TD CLASS="quote">but if the ecu doesn't have a tach reference , then how is it going to know when you reach proper rpm.. exactly


you can just hook up a vtec light to let you know when vtec is engaging. that's what i did to my h22dx swap without tachometer...works great! </TD></TR></TABLE>

do you normally search for archived threads to bring it back from the dead with a post about vtec lights????

prelittlelude

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xd69 &raquo;</TD></TR><TR><TD CLASS="quote">but if the ecu doesn't have a tach reference , then how is it going to know when you reach proper rpm.. exactly
</TD></TR></TABLE>

um the only response i can think of to this is that the ecu always has an rpm refrence because it comes from the distributor, so the car will know the rpm.

popnvtec

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CHK4TIX &raquo;</TD></TR><TR><TD CLASS="quote">Well, the info i want to add is. If your oil pan is dented pound it out. It took me 3 months of messing and replacing **** before i pounded out the dent in my oil pan and it fixed my problem.</TD></TR></TABLE>


I am having a problem with my vtec. It's not hitting till 6500 in first gear and then when I am in second it hits at 6500 then turns off at 6800 and throws a code. I have a jdm 1.6 single zc motor. with a stock p28 It is throwing code 22 presure switch. I tested it, it's fine but still threw the code again. I put another switch in still doing it. I have rewired the pressure switch and it is still throwing the code. I guessing it maybe the oil pressure. I havent checked it yet. I am going to buy an gauage whats a good pressure? Also when we put the motor in this past weekend I noticed that the oil pan had a dent in it. Wasnt to bad but its a pretty good dent. I didn't think nothing by it. Could this cause my vtec not to hit? Could that lower oil pressure? Anybody have this issue I really am stumped. Any help would be great thanks!

popnvtec

also my oil level is fine. Its right where it should be. I also am using 10w 30 oil instead of 5w 30 like it calls for if that makes a differnence.