Car problems
Thread Starter
Joined: Jan 2004
Posts: 154
Likes: 0
From: Anchorage, Alaska, United States
Car problems
I was wondering if you guys can help me solve my problem for my car. The problem is when I warm my car up for 5 minutes my Vtec dosent crossover and after awhile i been driving it starts working when my MPH neddle starts to work.
What do you guys think it is? Could it be a wire problem?
What do you guys think it is? Could it be a wire problem?
Joined: Oct 2004
Posts: 384
Likes: 0
From: Long Beach, NY, USA
Re: Car problems (NSXjr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NSXjr »</TD></TR><TR><TD CLASS="quote">I was wondering if you guys can help me solve my problem for my car. The problem is when I warm my car up for 5 minutes my Vtec dosent crossover and after awhile i been driving it starts working when my MPH neddle starts to work.
What do you guys think it is? Could it be a wire problem?</TD></TR></TABLE>
My vtec sometimes doesn't work because the car is cold.
You don't need to warm your car up for 5 mins... average required is 60-90 seconds.
What do you guys think it is? Could it be a wire problem?</TD></TR></TABLE>
My vtec sometimes doesn't work because the car is cold.
You don't need to warm your car up for 5 mins... average required is 60-90 seconds.
Junior Member
Joined: Feb 2003
Posts: 220
Likes: 0
From: melbourne, vic, australia
Re: Car problems (wpsadmin)
im no mechanic... and i guess it depends what oil you use...but i always warm my car for 5 mins espically in winter!
it's meant to do less damage to the engine because the engine oil warms up more and starts sticking better to the internals therefore better lubication...before you start raising your revs
i know people might argue this but...
better safe than sorry
it's meant to do less damage to the engine because the engine oil warms up more and starts sticking better to the internals therefore better lubication...before you start raising your revs
i know people might argue this but...
better safe than sorry
Honda-Tech Member
Joined: Mar 2002
Posts: 9,854
Likes: 4
From: Southern California, U.S.A.
Re: Car problems (NSXjr)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NSXjr »</TD></TR><TR><TD CLASS="quote">it starts working when my MPH neddle starts to work. </TD></TR></TABLE>
You answered your own question. There is a problem in your VSS circuit-either wiring or the sensor itself.
You answered your own question. There is a problem in your VSS circuit-either wiring or the sensor itself.
Honda-Tech Member
Joined: Jun 2002
Posts: 9,925
Likes: 0
From: Milwaukee, WI, USA
Re: Car problems (wpsadmin)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wpsadmin »</TD></TR><TR><TD CLASS="quote">You don't need to warm your car up for 5 mins... average required is 60-90 seconds. </TD></TR></TABLE>
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Azcheron »</TD></TR><TR><TD CLASS="quote">vtec wont engage unless ur going 15 mphs, so thats ur problem, if the needle dont work</TD></TR></TABLE>
Where do you people come up with this stuff???
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Azcheron »</TD></TR><TR><TD CLASS="quote">vtec wont engage unless ur going 15 mphs, so thats ur problem, if the needle dont work</TD></TR></TABLE>
Where do you people come up with this stuff???
Trending Topics
Members Only
Joined: Mar 2000
Posts: 2,793
Likes: 0
From: New York, NY, USA
Re: Car problems (Mugen Mike)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mugen Mike »</TD></TR><TR><TD CLASS="quote">Where do you people come up with this stuff??? </TD></TR></TABLE>
</TD></TR></TABLE>
Honda-Tech Member
Joined: Oct 2003
Posts: 11,340
Likes: 1
From: Homie dont, play that, USA
Re: Car problems (Azcheron)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Azcheron »</TD></TR><TR><TD CLASS="quote">its always been said that vtec doesnt engage unless you are doing 15 mphs
unless ive been mislead</TD></TR></TABLE>
ROFL
unless ive been mislead</TD></TR></TABLE>
ROFL
Honda-Tech Member
Joined: Jun 2002
Posts: 9,925
Likes: 0
From: Milwaukee, WI, USA
Re: Car problems (Azcheron)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Azcheron »</TD></TR><TR><TD CLASS="quote">its always been said that vtec doesnt engage unless you are doing 15 mphs
unless ive been mislead</TD></TR></TABLE>
Please show me somewhere that's been said. There's no way your RPMs will be high enough at 15 MPH for VTEC to engage anyhow.
Yes, you have been mislead.
unless ive been mislead</TD></TR></TABLE>
Please show me somewhere that's been said. There's no way your RPMs will be high enough at 15 MPH for VTEC to engage anyhow.
Yes, you have been mislead.
Junior Member
Joined: Oct 2003
Posts: 236
Likes: 0
Re: Car problems (TypeRlove)
i assume that vtech doesn't engage if the ecu doesn't feel some feed back from the VSS. When once i wired a b18c swap,and didn't connect the Vss,Vtech didn't engage.
So OR you have something wrong with the VSS wiring or There isn't enough oil press.
So OR you have something wrong with the VSS wiring or There isn't enough oil press.
Honda-Tech Member
Joined: Jun 2004
Posts: 1,549
Likes: 0
Re: Car problems (Mugen Mike)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mugen Mike »</TD></TR><TR><TD CLASS="quote">
Please show me somewhere that's been said. There's no way your RPMs will be high enough at 15 MPH for VTEC to engage anyhow.
Yes, you have been mislead.</TD></TR></TABLE>
so are you trying to say its not possible to launch at 5k? lol
Please show me somewhere that's been said. There's no way your RPMs will be high enough at 15 MPH for VTEC to engage anyhow.
Yes, you have been mislead.</TD></TR></TABLE>
so are you trying to say its not possible to launch at 5k? lol
Honda-Tech Member
Joined: Jun 2002
Posts: 9,925
Likes: 0
From: Milwaukee, WI, USA
Re: Car problems (Azcheron)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Azcheron »</TD></TR><TR><TD CLASS="quote">
so are you trying to say its not possible to launch at 5k? lol</TD></TR></TABLE>
What will your speedometer read if you are in gear at 5K RPM? Much more than 15 MPH I'm quite certain.
so are you trying to say its not possible to launch at 5k? lol</TD></TR></TABLE>
What will your speedometer read if you are in gear at 5K RPM? Much more than 15 MPH I'm quite certain.
Senior Member
Joined: Jun 2004
Posts: 10,399
Likes: 3
From: Chicagoland, IL
Re: Car problems (Mugen Mike)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mugen Mike »</TD></TR><TR><TD CLASS="quote">
What will your speedometer read if you are in gear at 5K RPM? Much more than 15 MPH I'm quite certain.</TD></TR></TABLE>
Sorry Mike, you're wrong.
You can rev it in neutral, and your rev limit will be only 8K or so, and there will be no VTEC.
You can also launch the car by slipping the clutch at 8K, and it will be a slow *** launch because your VTEC won't kick in until you're 15 MPH.
I ran across this a lot while autocrossing. It was obnoxious. I decided to use a wheelspin launch instead, and that warmed up the tires too.
-Chris
Like Mike just said: VSS!
-Chris
What will your speedometer read if you are in gear at 5K RPM? Much more than 15 MPH I'm quite certain.</TD></TR></TABLE>
Sorry Mike, you're wrong.
You can rev it in neutral, and your rev limit will be only 8K or so, and there will be no VTEC.
You can also launch the car by slipping the clutch at 8K, and it will be a slow *** launch because your VTEC won't kick in until you're 15 MPH.
I ran across this a lot while autocrossing. It was obnoxious. I decided to use a wheelspin launch instead, and that warmed up the tires too.
-Chris
Like Mike just said: VSS!
-Chris
Honda-Tech Member
Joined: Jun 2002
Posts: 9,925
Likes: 0
From: Milwaukee, WI, USA
Re: Car problems (Chris F)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris F »</TD></TR><TR><TD CLASS="quote">Sorry Mike, you're wrong.</TD></TR></TABLE>
So you're saying that if my tires are spinning with the motor at 5K RPMs, the speedometer isn't going to read higher than 15 MPH?
Please elaborate.
So you're saying that if my tires are spinning with the motor at 5K RPMs, the speedometer isn't going to read higher than 15 MPH?
Please elaborate.
Senior Member
Joined: Jun 2004
Posts: 10,399
Likes: 3
From: Chicagoland, IL
Re: Car problems (Mugen Mike)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mugen Mike »</TD></TR><TR><TD CLASS="quote">So you're saying that if my tires are spinning with the motor at 5K RPMs, the speedometer isn't going to read higher than 15 MPH?
Please elaborate.</TD></TR></TABLE>
I sorta quoted the wrong thing.
If your clutch is slipping, and your speedo is reading less than 15 (because you're only going 10 MPH), your VTEC will not engage, and you'll have an artificially low rev limiter of ~8000 RPM.
If you disconnect the VSS you get the same effect.
Please elaborate.</TD></TR></TABLE>
I sorta quoted the wrong thing.
If your clutch is slipping, and your speedo is reading less than 15 (because you're only going 10 MPH), your VTEC will not engage, and you'll have an artificially low rev limiter of ~8000 RPM.
If you disconnect the VSS you get the same effect.
Honda-Tech Member
Joined: Dec 2001
Posts: 5,871
Likes: 0
From: Jetsetter
Re: Car problems (Chris F)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chris F »</TD></TR><TR><TD CLASS="quote">
I sorta quoted the wrong thing.
If your clutch is slipping, and your speedo is reading less than 15 (because you're only going 10 MPH), your VTEC will not engage, and you'll have an artificially low rev limiter of ~8000 RPM.
If you disconnect the VSS you get the same effect.</TD></TR></TABLE>
Okay folks here's the scoop. The VTACK JASMA system must see a VSS (Vehicle Speed Sensor) signal. It is not necessarily dependent on a particular speed, the ECU just has to see a signal. The signal is a 5 volt step signal - basically the speed sensor spins and everytime it passes a certain point it sends a 5 volt pulse to the ECU. The speed of the pulses determines the vehicle's speed.
If you have a faulty VSS or, more likely, a corroded plug on the VSS you may get an intermitent check engine light and no indicated, or an irratic indicated, speed. IF this is the case go to the junk yard and cut the VSS plug off of any 92+ civic or 94+ integra and splice it in.
The VTEC system also depends on oil pressure (for USDM models) and sometimes if your oil is low and you are in a high G sustained turn you will lose VTEC. If that's the case add oil NOW and pray to the bearing Gods that you are not about to spin a bearing.
As Bob would say... Happy Motoring.
[edited for grammatical errors - not spelling
]
I sorta quoted the wrong thing.
If your clutch is slipping, and your speedo is reading less than 15 (because you're only going 10 MPH), your VTEC will not engage, and you'll have an artificially low rev limiter of ~8000 RPM.
If you disconnect the VSS you get the same effect.</TD></TR></TABLE>
Okay folks here's the scoop. The VTACK JASMA system must see a VSS (Vehicle Speed Sensor) signal. It is not necessarily dependent on a particular speed, the ECU just has to see a signal. The signal is a 5 volt step signal - basically the speed sensor spins and everytime it passes a certain point it sends a 5 volt pulse to the ECU. The speed of the pulses determines the vehicle's speed.
If you have a faulty VSS or, more likely, a corroded plug on the VSS you may get an intermitent check engine light and no indicated, or an irratic indicated, speed. IF this is the case go to the junk yard and cut the VSS plug off of any 92+ civic or 94+ integra and splice it in.
The VTEC system also depends on oil pressure (for USDM models) and sometimes if your oil is low and you are in a high G sustained turn you will lose VTEC. If that's the case add oil NOW and pray to the bearing Gods that you are not about to spin a bearing.
As Bob would say... Happy Motoring.
[edited for grammatical errors - not spelling
]
Joined: Nov 2003
Posts: 938
Likes: 0
From: MD, USA
there are a few thins that will keep vtec from engaging: motor not warmed up, low oil level, not full throttle pressure, and no stress on motor (free revs). mind you there could be other mechanical problems but this are factory features that keep vtec from not engaging
Senior Member
Joined: Jun 2004
Posts: 10,399
Likes: 3
From: Chicagoland, IL
Re: Car problems (Ausmith)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ausmith »</TD></TR><TR><TD CLASS="quote">The VTEC system also depends on oil pressure (for USDM models) and sometimes if your oil is low and you are in a high G sustained turn you will lose VTEC. If that's the case add oil NOW and buy a Mugen oil pan.</TD></TR></TABLE>
There ya go, I fixed it.
There ya go, I fixed it.
Thread
Thread Starter
Forum
Replies
Last Post
ED9
Engine Management and Tuning
4
Jun 7, 2009 12:38 PM