z6turbo

please help , no vtec on gsr swap in ef hatch ,skunk2 intake manifold, convert to obd1, use chip p28, no **check engine light** no dent on oil pan, replace to another vtec soleniod , but still the same,and reset ecu and try to run wire direct to ecu ; D3 = knock sensor, D6 = vtec pressures swich, A4 = vtec soleniod. again no check engine light at all only come on when turn key and go away after engine start, i use 96 itr tranny and cable vss sensor from b16 tranny, is it vss sensor? but there no check engine light , do i need electronic vss for obd 1 ecu to hit vtec? any idea plzz plzz help.. it just dont feel right when u have vtec engine and there no vtec. ..

Fabrik8

Yes, you need an electronic VSS. That's most likely your problem.

z6turbo

ty , but do i need to swap new cluster too? cuz right now i use cluster that work with cable vss. or is there a way to wire them? to work with electronic vss?

Fabrik8

Actually, I'm going to take that back. The VSS signal goes to the ECU regardless, and I believe it comes from the cluster in OBD0 cars. The cluster generates the signal (from the cable drive) to drive the speedo and supply signal to the ECU. So if your speed sensor wiring to the ECU is correct, you should be good to go. Sorry about that.

Fabrik8

If you can't engage VTEC by running a wire directly to the solenoid, you have a problem somewhere.




I just re-read.. You ran a wire directly to the ECU. That's not going to do anything if the ECU isn't engaging VTEC obviously. You can test the solenoid by running a wire directly to a 12V power source, and you can test the VTEC output from the ECU by hooking a 12V LED or borrowing a friend to probe the wire with a multimeter.

z6turbo

vtec working now, sound so nice , it turn out to be obd1 ecu need (+12V) signal for vtec to work. and i do some research and find this site , srry dont have the link to this site but i do save some picture from that site.

[ATTACH=CONFIG]120832[/ATTACH][ATTACH=CONFIG]120831[/ATTACH][ATTACH=CONFIG]120830[/ATTACH]

what i do is i solder wire to both end of resister and bolt it to the 12V screw for the fuel gauge and screw other end to the VSS screw on the left is connected to the trace that goes to the VSS input to the ECU . so when i turn on my car on, the ecu will get (+12V) signal right away.. . ,and i hope this help other ppl that have the same problem as me in the future.

ohh and u need 680k ohm resister. i get it from radioshacke for $1.49

and thank you sooo much to :Fabrik8 for ur reply and try to help...

Fabrik8

Actually just about any resistance over a few k ohms would work perfectly fine. It's just a pullup resistor, the value isn't critical at all for that application. If you actually used a 680k, the noise immunity is going to be much lower than with a smaller value though.