vtec issues - Honda-Acura.net

ranger3801 · 08-27-07, 06:39 PM

I have a 2000 s2000. The vtec is engaging properly, that has all been checked. With the vtec unplugged, so it does not kick in, the car runs great. However, with vtec plugged in, when it kicks in, the car runs horrible, like it is starving for fuel or air, and it sputters and has no power at all. It has plenty of fuel pressure, is getting plenty of fuel. We hooked up a fuel pressure gauge and an air fuel gauge. It is running right where it should be. Airflow is great to the engine. With vtec unplugged, it pulls hard all the way to 8000 rpms, but when it is plugged in, it runs fine until 6000 when vtec kicks in, and then just has no power. Does anyone have any idea what this could be?

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dubcac · 08-27-07, 10:39 PM

Is the check engine light on?

sherwood · 08-27-07, 10:57 PM

Thats the opposite from what should happen, I'm surprised it will even get that high in the revs without needing the cam switch.

I take it you haven't done any head work before this problem occurred?

How exactly are you "unplugging" the vtec?

dubcac · 08-27-07, 11:46 PM

I'm assuming he's unplugging the VTEC solenoid, which in of itself should turn on the CEL.

ranger3801 · 08-28-07, 10:12 AM

There is no cel, and I am unplugging it from the solenoid.

ranger3801 · 08-28-07, 10:14 AM

It will rev to 8000 with it unplugged just fine, but really does not build power after about 6500. With it plugged in, the vtec kicks in at 6000, and as soon as it kicks in it has hesitation, and doesn't want to go.

ranger3801 · 08-28-07, 10:46 AM

Does anyone have a pinout for the s2000 computer?

ranger3801 · 08-28-07, 10:49 AM

No headwork done at all. I hooked up a greddy emanage computer, and the car would not run right at all, unhooked it and now this is the problem I have. I don't know if I hurt something or what happened, but I have it wired back to stock, and have double and tripple checked the wiring, and am pretty positive it is correct.

sherwood · 08-28-07, 10:50 AM

Hows the compression on the engine?

maybe theres a problem with the valve springs

was the engine accidentally over revved in a down shift?

ranger3801 · 08-28-07, 02:16 PM

compression is fine, and it was not overrevved. Like I said, with the vtec solenoid unplugged, the car runs perfect.

sherwood · 08-28-07, 04:38 PM

Quote:

Originally Posted by ranger3801

compression is fine, and it was not overrevved. Like I said, with the vtec solenoid unplugged, the car runs perfect.

I posted that before I knew that you messed with the electrical, exactly what did you take apart, did you merely unplug the ECU and then put it back?

dubcac · 08-28-07, 10:58 PM

Have you tried swapping the ECU with a known good one?

personman93 · 07-15-08, 10:34 PM

dubcac sounds like he has the best idea.

08-27-07, 10:39 PM	#2
dubcac I WANT WINNERS Join Date: Jan 2001 Location: The W Posts: 53,762	Is the check engine light on? __________________ 03 S2000 / Apexi / ATE / Bilstein / Mugen / T1R / Work \|\| Academy Team 52 / Union Data Pinstripe Team B.O.B.® - Ballaz on a Budget "Hip hop is so wack, the beats are fighting back And I was sent to attack, so I'm following the map"

08-27-07, 10:57 PM	#3
sherwood I missed Sean Join Date: Aug 2004 Location: Fairfield/Bridgeport CT Posts: 10,987	Thats the opposite from what should happen, I'm surprised it will even get that high in the revs without needing the cam switch. I take it you haven't done any head work before this problem occurred? How exactly are you "unplugging" the vtec? __________________ 1.8L Acura Integra GSR: Back where it belongs. 3.2L Pontiac Tran-sport Montana: that things about to go. 2.2L Honda Accord EX: Sold to my sister 232CI Mercury Sable: Sold to some lady, by my father, while i was on a camping trip. IMM232 http://imagegen.last.fm/minimalDark/..._vigilante.gif

08-27-07, 11:46 PM	#4
dubcac I WANT WINNERS Join Date: Jan 2001 Location: The W Posts: 53,762	I'm assuming he's unplugging the VTEC solenoid, which in of itself should turn on the CEL. __________________ 03 S2000 / Apexi / ATE / Bilstein / Mugen / T1R / Work \|\| Academy Team 52 / Union Data Pinstripe Team B.O.B.® - Ballaz on a Budget "Hip hop is so wack, the beats are fighting back And I was sent to attack, so I'm following the map"

08-28-07, 10:50 AM	#9
sherwood I missed Sean Join Date: Aug 2004 Location: Fairfield/Bridgeport CT Posts: 10,987	Hows the compression on the engine? maybe theres a problem with the valve springs was the engine accidentally over revved in a down shift? __________________ 1.8L Acura Integra GSR: Back where it belongs. 3.2L Pontiac Tran-sport Montana: that things about to go. 2.2L Honda Accord EX: Sold to my sister 232CI Mercury Sable: Sold to some lady, by my father, while i was on a camping trip. IMM232 http://imagegen.last.fm/minimalDark/..._vigilante.gif

08-28-07, 10:58 PM	#12
dubcac I WANT WINNERS Join Date: Jan 2001 Location: The W Posts: 53,762	Have you tried swapping the ECU with a known good one? __________________ 03 S2000 / Apexi / ATE / Bilstein / Mugen / T1R / Work \|\| Academy Team 52 / Union Data Pinstripe Team B.O.B.® - Ballaz on a Budget "Hip hop is so wack, the beats are fighting back And I was sent to attack, so I'm following the map"

08-28-07, 10:12 AM	#5
ranger3801 Junior Member Join Date: Aug 2007 Posts: 7	There is no cel, and I am unplugging it from the solenoid.

08-28-07, 10:14 AM	#6
ranger3801 Junior Member Join Date: Aug 2007 Posts: 7	It will rev to 8000 with it unplugged just fine, but really does not build power after about 6500. With it plugged in, the vtec kicks in at 6000, and as soon as it kicks in it has hesitation, and doesn't want to go.

08-28-07, 10:46 AM	#7
ranger3801 Junior Member Join Date: Aug 2007 Posts: 7	Does anyone have a pinout for the s2000 computer?

08-28-07, 10:49 AM	#8
ranger3801 Junior Member Join Date: Aug 2007 Posts: 7	No headwork done at all. I hooked up a greddy emanage computer, and the car would not run right at all, unhooked it and now this is the problem I have. I don't know if I hurt something or what happened, but I have it wired back to stock, and have double and tripple checked the wiring, and am pretty positive it is correct.

08-28-07, 02:16 PM	#10
ranger3801 Junior Member Join Date: Aug 2007 Posts: 7	compression is fine, and it was not overrevved. Like I said, with the vtec solenoid unplugged, the car runs perfect.

07-15-08, 10:34 PM	#13
personman93 Junior Member Join Date: Jul 2008 Location: massachusets Posts: 21	dubcac sounds like he has the best idea.

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