Vtec problem
12-04-2008, 11:21 AM
#1
Giggity Giggity Goo
Thread Starter
Join Date: Oct 2008
Location: Charlottesville, Va
Posts: 250
Likes: 0
Received 0 Likes
on
0 Posts
Vtec problem
I have a JDM B16A swap in my 99 civic ex...my vtec kicks in to late at around 6500rpm. Im running a P30 ECU with a stock EX harness with modifying and i have checked everything i can think of like the oil pressure switch, the solenoid, knock sensor, ive cleaned and replace the solenoid gaskets...does anyone know how i can get it working properly or whats wrong with it?? Thanks
12-04-2008, 08:04 PM
#8
Sparkle Motion
Join Date: Jun 2006
Location: Va Beach
Posts: 1,818
Likes: 0
Received 0 Likes
on
0 Posts
Re: Vtec problem
Try reseting the ecu by diconnecting your battery, and holding your brake pedal down for 10 seconds with the battery disconnected.
Can't hurt to try.
Can't hurt to try.
12-04-2008, 09:48 PM
#9
Racetracks
Join Date: Nov 2002
Location: How long is a piece of string?
Posts: 15,668
Likes: 0
Received 0 Likes
on
0 Posts
Re: Vtec problem
Ok.. So I have some random thoughts on this:
First, are you engaging VTEC while driving, or just sitting, and if you're driving, what throttle opening are you at? There are 8 or 10 VTEC engagement points in a stock ECU (I can't remember exactly how many) and they are spaced out with load. The low load and high load engagement are usually about 1500 RPM apart, with the other 6 or 8 points at various spots in between. So if you have a stock P30, which I think is about 5500 RPM VTEC at high load (it's been a long time..) then you may be somewhere in the lower load range of engagement (higher engagement RPM). If you're actually under pretty heavy load when you're engaging at 6500 RPM, you may have a TPS problem because that is largely what the load determination is based off of. I can't believe I don't remember specifics about the P30, but it's been a long time since my Honda ECU hacking days.
First, are you engaging VTEC while driving, or just sitting, and if you're driving, what throttle opening are you at? There are 8 or 10 VTEC engagement points in a stock ECU (I can't remember exactly how many) and they are spaced out with load. The low load and high load engagement are usually about 1500 RPM apart, with the other 6 or 8 points at various spots in between. So if you have a stock P30, which I think is about 5500 RPM VTEC at high load (it's been a long time..) then you may be somewhere in the lower load range of engagement (higher engagement RPM). If you're actually under pretty heavy load when you're engaging at 6500 RPM, you may have a TPS problem because that is largely what the load determination is based off of. I can't believe I don't remember specifics about the P30, but it's been a long time since my Honda ECU hacking days.
Last edited by Fabrik8; 12-04-2008 at 10:00 PM.