Ray T

The engine is in and wired. Sending out the computer today to remove the vats...

Problem. I live in California and we have pretty strict smog laws.

I was told I HAVE to hook up the VSS in order for it to pass smog. The Donor vehicle was a 2000 astro van with an automatic trans. Im using the stock 5spd trans from my 89 4runner. I talked to a guy at advanced adapters today and he basically said I'm screwed as far as smog is concerned.

My questions..
1) Does anyone know of a work-around for getting the chevy computer to sense motion?

2) The oil pressure sensor on the 4.3 seems to only go inside to the oil pressure gauge. Is it possible that the Chevy computer doesnt need to know oil pressure? Seems kinda weird to me.

Thanks in advance!

MaK92-4RnR

Swapping motors is "harder" to do in california, yes. but its not impossible.

You need to have a motor that is newer than your vehicle.
You need to have ALL smog equipment functioning and installed.
Everything needs to be to code and spec. Exhaust included.

Then you'll have a swapped 4.3

Ray T

I've gone WAY out my way to keep all the smog stuff with the 4.3. I'm hoping the Vehicle speed sense wiring isnt the only thing that keeps it from actually being smog-able.

MaK92-4RnR

Install the motor exactly how it is intended to fit in the engine bay with all the smog items and itll be approved. guarantee it. You need to set the exhaust up how it was intended on a 4.3 v6 application too.

Ray T

The problem is that it wont physically pass smog w/out the computer sensing motion. I have the exhaust off of the astro van, so im not too worried about that being an issue.

Numbchux

The VSS is just a pulse signal. There are numerous ways to make it work.

If you have a cable speedometer, you have a few options. JTR makes a couple different speed sensors with fittings that match the toyota cable, so you can add a sensor inline with your cable:
http://www.jagsthatrun.com/Pages/Spe...eedometer.html

Also, there's a speed sensor built into the stock toyota speedo. This signal is already sent to the ECU for just that reason. now, I have heard some people say that they've been able to just hook that signal wire up to the 4.3 ECU, and it has worked perfectly from the get-go. I have hooked mine up that way ('92 CPFI 4.3, '87 4runner)....haven't driven it yet, so I don't know if it'll work.

If it doesn't work, there are numerous ways to adjust the pulse frequency. Most of them designed to adjust the signal to account for different tire sizes, but there are generic, adjustable units too.


If you have an electric speedo, I don't know if the JTR sensor will physically work. but even still, you have a signal to work with. There's a way to convert it to something that the 4.3 ECU can understand.

bigarms23

im running a jtr vss sensor and mine 4.3 has passed the ca ref

Ray T

Any chance you remember the model # of the VSS you got from JTR? Thanks guys!

Numbchux

oh.....btw. It's not uncommon for the ECU to not monitor the oil pressure. Although my '92 4.3 has a dual-sensor, with a normal resistance-to-ground signal for the gauge, and a switch that cuts the fuel pump if the oil pressure cuts out.

samiam39

I just put a 4.3 out of a 2003 astro van in my truck and its ca smog cert, but I took the trans with it, It was my understanding(my not be fact) that to do the conversion you had to take the trans that came with the engine from the same donor vehicle. Now with that being said I know there were ways to get the signal from the Speedo cable point. Not sure who makes it but Downey off road use too. Now there closed up so someone has to have it