preludatic

ok, so as u know, i swaped in a USDM h22a1... and also used the same ECU from the VTEC car i got it out of..

well, my vtec still doesnt work. I have a 95 Si, and all the wires were there... im not lying.. they were THERE... i mean, from the solenoid, all the way to the harness to the ECU, the wires were all there. But just in case, today i ran all the wires seperatly, by splicing into the ones on the vtec solenoid, and running them to the ECU harness.. from there, i spliced them into the light blue/greenyellow wires. (the reason i did this is because there wires were there already, with pins in the connector.) I also hooked up the VTEC ground wire, to the ground on the radiator support. Then i re-connected the battery, and off i went. No vtec. I even let the motor warm up... still no vtec. Then i reset the ECU (disc. baterry).. still no vtec.

But im running NO vtec CEL codes.... the only two codes im throwing, are O2 sensor, and VSS (vehicle speed sensor, which is also causing me to have no speedometer). Could EITHER of these be causing my vtec to fail? I'm running out of solutions!

trident

If you don't have VSS your VTEC won't work. VTEC depends on oil pressure, speed, and engine RPM. If you fix the VSS problem, you should fix the VTEC problem.

red92s

An O2 sensor code might put the car into limp mode

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7/20/2000 - 4/09/2007

Replaced with: "Zoom-Room"; 2003 Mazda Protege5

Zimmlude

First thing's first: FIX THE DAMN CEL!!!!!!!

That light is there for a very good reason, you can't just ignore it.

Now like trident said, VTEC will not engage and your car will be in "limp mode" (i.e. no VTEC, running rich, generally bad,ect...) if the CEL is tripped. Also, since VTEC is speed sensitive (won't engage below 1x mph) if your VSS is not hooked up the ECU will see you are standing still and guess what, no VTEC.

So, thing to do:

1. Plug in you VSS (the plug is on the main engine harness)
2. Replace you O sensor (just do it, they cost $$ but you need it)

After doing those see if you have VTEC, if no then come back and ask.

HTH,

p.s. sorry if I seem a little snappy but you need to take advice given to you in other threads before posting a frustrated thread like this.

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Jason

[SUB[EX]

Yea my VSS bolt was missing, so once in a while it would pop out. Was kinda frustrating, especially when your racing and at 6k vtec kicks off. haha

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AIM:ISUBIEXI
S/SI/Vtec Hybrid. RS*R Header, JDM downpipe, Custom Downpipe back 2.25 Exhaust, Intake, ""Mugen"" Programmed p13, No balancer belt, no AC, Fidanza Flywheel, ACT clutch, SI trans, Power Slot rotors, SkunkII Coilovers, Enki Rims.