View Full Version : VTEC question
EGB16A
22-05-2005, 08:36 PM
OK, basically VTEC isn't engaging, and i just have a few questions.
I have a EG with B16a motor. VTEC used to work consistantly up until recently. I'm currently in the process of pin pointing the problem. The other week i changed the oil and filter, along with spark plugs. After doing this i let the car reach normal operaing temperature and took it for a drive, and still no VTEC. We reset the ECU next, and still no VTEC. I parked the car over night and then in the morning vtec worked! after reaching my destination i turned the car off... and from there on NO vtec again!
I have a leaking header, and i'm wondering if this could affect any sensors?
I checked the solenoid and it still seems to work fine!
How can i check the connection between ecu and solenoid?
My car idles really high, particularly on a cold start, and i think i've narrowed it down to being the FITV under the throttle body, but will this also affect vtec engaging?
Any other information would be greatly appreciated.
thanks in advance
EGB16A
23-05-2005, 02:19 PM
any body have any idea? It really sucks having no vtec!
Euro_Boy
23-05-2005, 02:44 PM
VTEC solenoid is probably screwed.
EuroAccord13
23-05-2005, 03:44 PM
Yeap.. See if the solenoid is leaking...
not throwing any codes ?
cleam the mesh in your vtec solenoid..
is your tacho working fine ?
CONAN
23-05-2005, 08:45 PM
thats what i fear everyday when i hit it. that vtec doesnt kick in!Worst nightmare!!
any answers ppl.
ProECU
23-05-2005, 08:58 PM
dont go into vtec territory until you get it fixed.
The ECU is switching fuel & timing (more agressive) and if your vtec lobe isnt activated, you'll eventually cause harm.
get it fixed sooner than later
ECU-MAN
23-05-2005, 10:08 PM
you should put a test light on th eVTEC solenoid wire and make sure when you dive your car in VTEC conditions the light lights up solid, Not dim or dim-bright-dim.
make sure your oil level is correct. not to low
also check the resisteance of your VTEC solenoid from its wire to Ground.
EGB16A
24-05-2005, 11:44 AM
not throwing any codes ?
cleam the mesh in your vtec solenoid..
is your tacho working fine ?
I shorted the little connector under the glove box, and when i put the ignition on the engine light just stays on! I'm assuming no codes?
ECU-MAN
24-05-2005, 03:59 PM
yep no codes
prolly a blocked vtec solenoid.. take it off and clean it up
EGB16A
24-05-2005, 10:05 PM
I took the solenoid off, and gave it a wipe and cleaned the oil that was around. I'm assuming thre should be a bit of oil once i take the solenoid off?
I saw the mesh bit, but i didn't want to come off easily, so i left it and just wiped it from the top. Should it come off, or will i damage it?
PS. vtec still didn't work after this
shep9ky
24-05-2005, 10:37 PM
when my vtec kicks in it makes a ****ing crazy noise
i have just put on a simota air filter and am wondering if it can actually work hard enough
it sounds sort of like a jack hammer going really really fast
if that makes sense
with the stock filter you could hear it but it didnt ****ing bark, sounds good but very different to what i thought it would
EGB16A
25-05-2005, 11:16 AM
I have an aftermarket panel filter, but that aside i know what my vtec sounds and feels like, and it just aint there!
Getting very annoying now!!
tinkerbell
25-05-2005, 12:43 PM
low oil pressure -
check your oil level,
check oil pan for dents,
tinkerbell
25-05-2005, 12:44 PM
what ECU are you using (so i can tell you how to check for continuity between solenoid adn ECU)
EGB16A
25-05-2005, 02:30 PM
low oil pressure -
check your oil level,
check oil pan for dents,
I checked oil level last night and it seems to be ok, but will check again.
I know there is a few dings in the oil pan, but vtec was ok with the same dents before.
It is supposed to be a 93 delsol motor, so me thinks it is a ODB2?
tinkerbell
25-05-2005, 02:31 PM
what is the exact model number on the ECU?
EGB16A
26-05-2005, 07:49 PM
the ECU is a P30, i just checked it... is that more of a help?
ProECU
26-05-2005, 07:59 PM
please provide the suffix info as well
ie P30-G01, P30-J00 etc
civiceg9
26-05-2005, 09:47 PM
Leaking oil affect the engagement of VTEC as there is not enough oil to push the VTEC to engage. You should change the gasket at the end of the cam, is a like a black rubber cap behind the VTEC solenoid, which usually leaks as the rubber ages.
tinkerbell
26-05-2005, 10:44 PM
My car idles really high, particularly on a cold start, and i think i've narrowed it down to being the FITV under the throttle body, but will this also affect vtec engaging?
ahhaa!
back to the original post!!!
the FITV operates as the coolant heats up,
if coolant does not heat up - the FITV stays open, causing high idle.
further, IF the coolant is not warm enough, the ECU will not allow VTEC will not engage!
maybe time to replace the thermostat???
what does your temp needle show?
tinkerbell
26-05-2005, 10:46 PM
(this is just a 'covering all bases' suggestion though)
DC2108
26-05-2005, 11:36 PM
WHAT IS solenoid pplz im newbi i wanna learn about it ?
tinkerbell
27-05-2005, 10:13 AM
WHAT IS solenoid pplz im newbi i wanna learn about it ?
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EGB16A
27-05-2005, 10:35 PM
ahhaa!
back to the original post!!!
the FITV operates as the coolant heats up,
if coolant does not heat up - the FITV stays open, causing high idle.
further, IF the coolant is not warm enough, the ECU will not allow VTEC will not engage!
maybe time to replace the thermostat???
what does your temp needle show?
I found this tech on honda-tech.com for the fitv and will check it this weekend, given the chance click here (http://www.honda-tech.com/zerothread?id=699787)
Temp guage shows a bit under half ( normal opperating temp i assume?) But would the fact that i have a teg radiator make any difference?
ECU-MAN
27-05-2005, 10:55 PM
no, will make no difference
EGB16A
09-07-2005, 06:15 PM
finaly got my problem sorted.... FINALLY!!!!!!!!!!!!!!!!!!!!!
what was the problem?? and how did u solve it
Newcivic
09-07-2005, 06:45 PM
what was the problem!
waymad
09-07-2005, 06:59 PM
man if there is no check engine light on than its nothing to do with the electrical side of the vtec it than has to be some component of vtec failing but still working as if it did not work at all the check engine light would be i would do the testes you can do with vtec and find out i have the paper work if you dont have a manual for ur car but i would of done this straight away but you fixed it now what was the problem
CONAN
10-07-2005, 03:02 AM
so tell us the problem son!!!!!
and how u resolved it?!
EGB16A
10-07-2005, 03:42 PM
I fixed the FITV (screwed the white thing inside back down) this brought the idle back to normal which is awsome. Took it for a drive... but no vtec.... reset the ecu and BOOM vtec was back!!!
but, today its been cutting in and out or not working at all, and is still throwing the codes (22 and 41 from memory).
i'm resetting the ecu again as i type this post to see how it goes once i start it up again. If it works, can i come to the conclusion that my ecu is stuffed? i'm thinking possibly a dry joint or a leaking capacitor onthe circuit board.
have ecu's like this been known to fail?
ProECU
10-07-2005, 04:22 PM
22 = Vtec Oil Pressure Switch
41 = Primary O2 sensor
A bad O2 sensor will effect ur idle. You've incorrectly masked the issue by altering FITV.
Honda ECU's rarely go bad.
EGB16A
10-07-2005, 08:47 PM
22 = Vtec Oil Pressure Switch
41 = Primary O2 sensor
A bad O2 sensor will effect ur idle. You've incorrectly masked the issue by altering FITV.
Honda ECU's rarely go bad.
I don't believe so, the FITV isn't supposed to be permanently open is it ie. flush against the end cap?
mini_s2000
10-07-2005, 09:32 PM
hey, i've got a b16b in my ek4 civic and have been having the exact same problems ever since the engine swap... i've tried everything so now i'm importing the b16b computer. then i'll go from there!
mini_s2000
10-07-2005, 09:36 PM
i know how annoying the feeling can be of having vtech... and then having no vtech...
EGB16A
10-07-2005, 09:43 PM
i know how annoying the feeling can be of having vtech... and then having no vtech...
yeah it sucks... do you also have a high idle problem?
mini_s2000
11-07-2005, 04:41 PM
yeah when my vtech is working my revs moves up and down when idling... but whe it's not working it idle's normal, doesn't make sense to me?
h22a accord
11-07-2005, 04:50 PM
its VTEC god dammit! why do peeps insist of calling it anything else?
mini_s2000
11-07-2005, 06:21 PM
who cares idiot
mini_s2000
11-07-2005, 06:23 PM
its VTEC god dammit! why do peeps insist of calling it anything else?
keep to the topic, reply if you can help.
Usual Suspect
11-07-2005, 07:15 PM
who cares idiot
Quote:
Originally Posted by h22a accord
its VTEC god dammit! why do peeps insist of calling it anything else?
keep to the topic, reply if you can help.
Then do the same yourself.
Take it to a good honda workshop, better to be safe then sorry.
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