vtec missing..

[ef-civic]

hey i noticed that when it hits vtec in b16a it sometimes misses.. i have now noticed that its getting worse... any idea's what it is ?? maybe the wiring in ecu ??? vtec controlleR ??

[shadou]

checked the obvious things yet? like low oil ect?

[andiiso]

or too cold lol, not at operating temp, mayb o2 sensor

[ef-civic]

same temp as always.. and the oil seemed fine.. when i checked.. i got told it might be something in the dizzy ?? like the high rev something ??

[Limbo]

o2 sensor will not effect vtec

main things are;
1) oil pressure
2) vtec solenoid
3) water temp

First thing, check oil level, if that's ok then check vtec solenoid. There is a DIY on how to check the solenoid.
Water temp is pretty normal to check.

Now if that is all ok, you need to get it checked properly by a mechanic.

[DreadAngel]

Vtec fell off yO :p

Sorry had to do that XD

[ef-civic]

haha fell off alright..

[Limbo]

Or could be this
cracked Lost Motion Assembly Holder :thumbdwn: thanks to Luke for the pic

http://www.doubledynasystems.com/Car/Image006.jpg

[ef-civic]

cant really see picture.. but um not sure aye.. not really a tech head.. where abouts is that ?? can i see it if i check ?

[Limbo]

you need to take the rocket cover to see it. Prob best to take it to a decent honda mechanic

[traumatized]

when was your last service? do you know the weight of the oil you are using? 10w30? i've seen hondas that have been serviced by local mechanics that have put oil that is too tick for hondas and the vtec doesn't feel as strong when it hits.

changing the oil to a more suitable weight fixed the issue

[Limbo]

when was your last service? do you know the weight of the oil you are using? 10w30? i've seen hondas that have been serviced by local mechanics that have put oil that is too tick for hondas and the vtec doesn't feel as strong when it hits.

changing the oil to a more suitable weight fixed the issue


may not feel strong but the weight will not effect vtec itself operating.
As its an intermitted issue its prob one of the above i stated.

Hanny's performance was good at working mine and Luke's problem.
If your in syd you should drop by

[Nepolian]

Could be something else which is causing the car to miss under load, ie. when vtec kicks in. Also check the usual things like leads, plugs and the coil etc...pending in the age maybe even the fuel pump.

If not mech minded.....probably best to take to good mech!

[philBo]

o2 sensor will not effect vtec

main things are;
1) oil pressure
2) vtec solenoid
3) water temp

First thing, check oil level, if that's ok then check vtec solenoid. There is a DIY on how to check the solenoid.
Water temp is pretty normal to check.

Now if that is all ok, you need to get it checked properly by a mechanic.

great post limbo :thumbsup::thumbsup:

[bennjamin]

engine load / throttle will change the way VTEC engages/feels/sounds too.

IE light throttle or uphill etc will not make the engagement as harsh or noticeable as flat foot on a flat road etc.

[Jonald]

Yeah i was going to suggest vtec solenoid...

[cvicek]

Talk about vtec not engaging, the other day, when i got fuel level on E, and i try to push it , vtec not kicking in, after i fill up at the petrol station, vtec kicks in after that .. so i think fuel is probably one of the major reason, for me...

also just wondering, what will be the suggest type of oil for b16a2 engine? i use 10/40w... any suggestion?

[andiiso]

i like to use 5w-30, or 10w30, since genuine honda fluid is 10w-30 BUT in the shop manual for b16a's the 5w-30 is the best recommended.

[Dy_]

Talk about vtec not engaging, the other day, when i got fuel level on E, and i try to push it , vtec not kicking in, after i fill up at the petrol station, vtec kicks in after that .. so i think fuel is probably one of the major reason, for me...

also just wondering, what will be the suggest type of oil for b16a2 engine? i use 10/40w... any suggestion?

depends on the condition of your engine as well. how many kms have you got on the clock? is it burning any oil?

[TheSaint]

>always only use honda FEO 10w30
>always warm the car for at least 15min before hard VTEC (30min preferably)
>always run on medium level of preffered fuel (i found that Caltex 96 and 98 wer the best for me)
>check that u have good plugs/clean etc
>water + oil lvls are good and clean
>air intake is not obstructed and the filter is clean

(experience taken from a b18c in a Dc2 and a little from my 1.5sohc efi civic)

failing that and any other more technical suggestions by others... take it too a honda mechanic... they are not cheap but they are worth a professional opinion

[teaseR]

>always only use honda FEO 10w30



can you tell me why i should always use honda FEO?

[Limbo]

Specified by honda for honda engines. Unless you get something better you should use it. If your asking the Q then use FEO.

[B16bcivic]

1.When V-tec don't kick in properly is because maybe the higher RPM cam lob is not working properly bro may be loose. or your higher RPM rocker arm must be loose. check both

2.It won't be the solenoid coz if its the solenoid you won't even get vtec to kick in.

3.If its water pump your car won't even run properly.

4. Vtec not kicking in proplery has nothing to do with engine oil lvl bro aslong as theres abit engine oil in the car vtec will still kick in good.

Correct me if im wrong guys. Cheers.

[teaseR]

1.When V-tec don't kick in properly is because maybe the higher RPM cam lob is not working properly bro may be loose. or your higher RPM rocker arm must be loose. check both

2.It won't be the solenoid coz if its the solenoid you won't even get vtec to kick in.

3.If its water pump your car won't even run properly.

4. Vtec not kicking in proplery has nothing to do with engine oil lvl bro aslong as theres abit engine oil in the car vtec will still kick in good.

Correct me if im wrong guys. Cheers.

1. dont know what u talking about

2. it could be the solinoid therefore vtec doesnt engage.

3. if seize waterpump car would overheat. may cause damage engine but seems fine, its still running.

4. low oil level doesnt engage vtec.

[teaseR]

Specified by honda for honda engines. Unless you get something better you should use it. If your asking the Q then use FEO.

not having a dispute with you but what hes saying is ALWAYS ONLY use FEO which is incorrect

[SNKS2K]

I had this exact same problem when i first purchased my car. for some reason it had a Vtec controller and a Greddy piggy back on a stock car. ripped it all out. sont have an issue with it till this day.

get you car propperly tuned would be my first guess.

[B16bcivic]

1. dont know what u talking about

2. it could be the solinoid therefore vtec doesnt engage.

3. if seize waterpump car would overheat. may cause damage engine but seems fine, its still running.

4. low oil level doesnt engage vtec.

Do you know how vtec works bro?

My cuzzie had a blown b16a eg6, low lvl of oil, with water in the engine and still hits vtec beating a gts-t minor mods bro. Only know from experince.

[B16bcivic]

depends on the condition of your engine as well. how many kms have you got on the clock? is it burning any oil?

Ur right bro,

The major of vtec kicking in is depemdent on your fuel too but not always, not on your engine oil lvl guys. Solenoid is wat holds the fuel pressure till it fills up and then opens it to allow it to triger the pin thats holding the higher cam lob which controlls the VTEC to kick in. If don't know guys, type in youtube.com and type in how vtec works it will show a baisc diagram of how vtec works.

[timster1200]

I had this exact same problem when i first purchased my car. for some reason it had a Vtec controller and a Greddy piggy back on a stock car. ripped it all out. sont have an issue with it till this day.

get you car propperly tuned would be my first guess.

Forget what everyone else has said, listen to SNKS2k. I also had exact same problem, only misfires under load and no one knows where it comes from. My EG w/b16b has been at ward whiles for at least a month now. They have been trying to diagnose problem, taking each part off putting new one on and then testing. They couldnt find a thing, only thing to do is get it on the dyno so they can it can be tested under load and at high revs. Hopefully mine will be ready soon and ill be able to assist you.

I feel for you just when you get all excited your car goes limp

[Limbo]

alright some of you guys don't have a clue how vtec works.

Now vtec is the lode moving into engage the vtec, the solinoid effects the change over.

Now the solinoid allows the oil to move into the vtec gallery to push the lobe. If there is not enough oil pressure the vtec lobe does not engage properly.
The solinoid only works on water temp. So long as the engine is at a certain temp, 1/4 up the vtec soilnoid will engage.

Then when the vtec solinoid engages its up to the oil pressure to engage the vtec lobe to give you that second profile.

The only thing that might effect the vtec solinoid also is if the computer is in limp mode. That's generally if you get continious error codes from the ECU

[aaronng]

Ur right bro,

The major of vtec kicking in is depemdent on your fuel too but not always, not on your engine oil lvl guys. Solenoid is wat holds the fuel pressure till it fills up and then opens it to allow it to triger the pin thats holding the higher cam lob which controlls the VTEC to kick in. If don't know guys, type in youtube.com and type in how vtec works it will show a baisc diagram of how vtec works.

Are you implying that Honda engines use fuel pressure to physically engage the VTEC pin?

[aaronng]

ef-civic, when you say VTEC is missing, do you mean it is misfiring or totally not engaging once in a while?

[ef-civic]

misfiring.. and just seems a little sluggish ?? sometimes doesnt kick in at normal time and stuff..

[B16bcivic]

Checked spark plugs? could be just a simple thing as that.

[aaronng]

misfiring.. and just seems a little sluggish ?? sometimes doesnt kick in at normal time and stuff..

Yup, check the plugs and the leads, clean the dizzy cap and replace the fuel filter.

[Limbo]

sounds more like your not getting enough pressure to the vtec lobe. Happened to me also.

have you done any mods like oil cooler or anything that might affect oil pressure?

Try borrowing or buying a oil pressure guage and see what the pressure is.

Best thing do a full oil change and change the filter.
Use FEO oil and an original honda filter.
that's prob the best start before anything else

[SNKS2K]

alright some of you guys don't have a clue how vtec works.

Now vtec is the lode moving into engage the vtec, the solinoid effects the change over.

Now the solinoid allows the oil to move into the vtec gallery to push the lobe. If there is not enough oil pressure the vtec lobe does not engage properly.
The solinoid only works on water temp. So long as the engine is at a certain temp, 1/4 up the vtec soilnoid will engage.

Then when the vtec solinoid engages its up to the oil pressure to engage the vtec lobe to give you that second profile.

The only thing that might effect the vtec solinoid also is if the computer is in limp mode. That's generally if you get continious error codes from the ECU

ohhh and i forgot... yeah my car also went into limp mode, where the engine light appears while driving or starting the car. and then it wont rev higher then 3k.

to anyone who has had this issue... i feel for ya.