I have an 88.5 Sami with a 92 EFI that I put on it. I'm running rich and failed emissions. I got a VSS switch a couple years ago but never installed it. I was told the EFI came from a Sami and not a Trackick, but I don't seem to have the Yellow/white/red stripe wire that goes to the VSS. Is it possible that I have an 89-90 trackick harness? I have read that they didn't have a VSS wire. Were the harnesses the same?

Does anyone know if you can hook up a VSS to the 89-90 trakick harness?

Thanks for any advice.

on mine the wire comes from the ecm yellow and it goes to the reed switch that you put on the back of your speedo your self, yellow wire to reed, the other wire from the reed goes to ground, this will help keep it from stumbling when you slow down for a light and help with the gas mileage a little bit, if the return line on your fuel injection is too small it will flood your system with fuel.

How is the truck running? do you have a 1.3 still or did you install a 1.6?

The MAP sensor has a major input to the ECM for the fueling of the engine,
make sure it is connected to a vacuum port that reads the engine vacuum
in real time, and that there are no check valves between the engine vacuum
signal and the MAP sensor.

Also list your failed emission test numbers, both actual and the max limits
for an idea of what is going on

Wild 

I have the stock 1.3.  The rig was a towed behind a motorhome and has 70,000 miles on the odometer.  Everything was swapped with the EFI, including the entire wiring harness.

Other than running rich, it runs great.  I have stock gearing, 235s, Thorley header and 2"exhaust, modified cam, decked head and new valves and it will hit 75 mph any time I need it to.

I think I just had a major DUH moment!

All of the VSS threads I have looked at have a yellow wire running to the VSS. I don't have the yellow wire.  I think that's part of my problem.  After looking at the FSM supplement, I noticed that the VSS wire for an injected Sammi is brown.  Maybe the trackicks all have the yellow wire and the Samis have the brown.

I know about needing a bigger return line, but I don't know if I actually did it or not.

I'll have a chance to dig into it on Monday or Tuesday and I'll let you know what I find.

Thanks again!

....and that there are no check valves between the engine vacuum
signal and the MAP sensor.

Umm, yeah there is.

All of the VSS threads I have looked at have a yellow wire running to the VSS. I don't have the yellow wire.  I think that's part of my problem.  After looking at the FSM supplement, I noticed that the VSS wire for an injected Sammi is brown.  Maybe the trackicks all have the yellow wire and the Samis have the brown.

The samurai VSS wire should be brown/yellow.

Quote from: wildgoody on June 04, 2011, 09:04:08 AM

....and that there are no check valves between the engine vacuum
signal and the MAP sensor.

Umm, yeah there is.

There should be no check valves or the MAP cannot read real time vacuum of the engine
and it will run like crap, I tried this to keep turbo pressure from messing up the MAP readings
because it was throwing a CEL at boost, but it in effect kept a vacuum signal at the MAP and
the truck ran like crap

See pics....
EFI samurai MAP and check valve.
Trackick MAP and check valve.

I thought that is a filter, or a back fire check so you don't damage the MAP, but if I remember
air flows freely both ways, but I've been wrong before

I thought that is a filter, or a back fire check so you don't damage the MAP, but if I remember
air flows freely both ways, but I've been wrong before

No.  I just checked it.  It holds vacuum when you have the vacuum pump connected to the engine side of it, but it flows freely, when you have the vacuum pump on the MAP sensor side of it.

That brings up a question then, how is the MAP going to read
the Manifold Pressure if it's not free flowing both ways?

I don't remember my 89' having anything but a oval loop and a fitting in the intake manifold
on the line to the MAP

So how does your truck run? Does it run good as set up like that?

That brings up a question then, how is the MAP going to read
the Manifold Pressure if it's not free flowing both ways?

I don't remember my 89' having anything but a oval loop and a fitting in the intake manifold
on the line to the MAP

So how does your truck run? Does it run good as set up like that?

89/90 trackicks may be different....you know they are kinda odd, compared to the later trackicks.  91s have the check valve.
It is all factory, so it works and runs fine.

Well if it's running fine I wouldn't be inclined to change it, but it seems
like it would not be getting the proper signal, that's the only thing that
has me wondering.

If you hook a vacuum gauge to the map side and start the engine, I wonder
if it changes with engine load, if it does that should be good, but if it doesn't
I would be surprised that it runs so well

I started doing some digging.

I definitely have a Sami harness.  The Sami VSS wire is the brown/yellow wire, not the yellow wire in a trackick.  Thanks Skyhiranger!

I got it wired in.

I realized that I had swapped the vent and return lines in the engine bay, but not at the tank.  I kept the stock 88.5 tank and put in the Ford F150 fuel pump. The vent line has a one way check valve in it.  I swapped the lines at the tank.

Two problems down but still too rich, and I can't get an idle under 1200-1500.

I discovered that an EFI engine takes a 195 thermostat and a carb takes a 180.  So I swap thermostats.

Upon removing the Tstat I see that someone ( ) had pinched two wires in between the housing and block.  They are the wires that go to the throttle opener VSV and the insulation on the positive wire is torn off.  I was grounding the throttle sensor out on the block!

One more thing down.  It's better, but still too high of an idle.

I look up the vacuum hose routing between the EFI and the Carb and I see that the carbon canister has three lines for a carb and only two for an EFI.  I see three hoses.  I have the carb canister.  I notice a t fitting coming out of the throttle body with one hose going to the third inlet on the canister.  I remove the t and plug the end of the hose that was attached to the t and connects to the cannister at the t end.

It idles at 900!!

I go to get my emissions test again.  I get a 193 on HC (hydrocarbons) at cruise.  The limit is 190!  I failed by three parts per million!! I pass the idle 181 out of a possible 220, and I pass CO with flying colors.  I'm gointg to due a valve adjustment, new plugs and add some fresh high octane fuel to the tank.  Any other suggestions?  I already threw a can of Seafoam in last week.

Change the oil, dirty oil gets sucked into the PCV and will add to the HC on a test