MSefi.com read only forum (Jan.15,2018)

I am going to scrap using the thing period.

I don't mind keeping my foot on the pedal while warming it up.

Thanks again.

Matt Cramer wrote:Are you sure this is, in fact, a stepper motor? It sounds to me like you may have a DC servomotor and the other three wires are a potentiometer for an IAC position sensor. What exactly is this IAC out of?

You may be onto the problem there Matt.

It is from a 91 Chevy Sprint 1L non-turbo.

Welder

Alrighty then. I finally got fed up with the stepper motor doing odd things while trying to get my truck started, so I ripped it off. A few minutes ago, I decided to really see what wires did what. Out of the 5 wires, 2 move the damn thing.

Using a battery charger for a quick power source... With ...

Well, it looks as though my pump is what's FUBAR.

12v supply > switch > fuse> pump > ground

The pump acted the same way as previously described.

I shall spend money, thus fixing the problem

Thanks for the help guys (girls if any).

Welder

Thanks Fury.

I used the pressurized (to-TBI) fuel line for my little test.

I will go wire the pump to a rocker switch, see how far I get tonight, then report back here.

Thanks for the help so far.

Welder

Well there is my problem :)

I have a stand-alone fuel pressure regulator, but I don't have it currently installed, as I was told that GM TBI's have a built-in FPR.

My system is as follows:

Tank>pump>filter>TBI>tank

When I get home, I will try to "bleed" the system, although I doubt it will do ...

After finally getting my truck to start, and not fall back into the "cranking" parameters, I have a small problem. I am sure there is a simple answer.

After deducing that the engine really was running out of fuel, and not losing spark, I pulled the fuel line off the TBI and put it in a clear water ...

Good to hear that you got it idling.

I am having the same problem. What did you do to right it?

Thanks in advance.

Thanks twofouroh.

Sounds good.

Looking at the V3.0 diagram (http://www.megamanual.com/index.html), should the O2, fuel pump and main relay be grounded to the engine, or is the negative terminal on the batter good enough? I was also wondering the same about pins 8,9,10,11 and 18; should they go to the engine ground ...

Sounds good.

Looking at the V3.0 diagram (http://www.megamanual.com/index.html), should the O2, fuel pump and main relay be grounded to the engine, or is the negative terminal on the batter good enough? I was also wondering the same about pins 8,9,10,11 and 18; should they go to the engine ground ...

In my MSII wiring harness, there are the standard 6, black grounds.

As per the megamanual, pins 8,9,10,11 and 18 are to be grounded to the same lug. Leaving the ground from pin 19 for sensor grounding.

My question is, does pin 19 HAVE to the sensor ground?

I am trying to get around taking my ...

What are you squirting?

If you have a throttle body injection system, and if coolant runs through it, put the sensor close to that.

Yes, the LC1 is very easy to wire.
there are two versions, the one I have has 6 cables to wire:
Blue + White goes to common ground
Red goes to +12v switched
Then yellow is NB output 1 (low res) > you can feed this to let's say stock ecu or a NB gauge
Brown is NB output 2 (high res) > you can feed ...

So, getting closer to install time.

I searched and got very close to getting a straight answer, but didn't quite nail it down.

On my MS-2 wiring harness, I see the one that says 12VDC, that one will be my switched positive right? Which ground do I use to ground the MS itself? Just one of the ...

Yes, the LC1 is very easy to wire.
there are two versions, the one I have has 6 cables to wire:
Blue + White goes to common ground
Red goes to +12v switched
Then yellow is NB output 1 (low res) > you can feed this to let's say stock ecu or a NB gauge
Brown is NB output 2 (high res) > you can feed ...

Lance, you have all the answers.

Haha, thanks yet again.

Thanks Lance.

Do I need to run a vacuum line from the TBI unit to the intake, or does it have an internal meter?

Hey everyone.

I'm turbocharging my 90 Sambar KS4 pickup and have a question about the TBI assembly I chose (from a scrap yard).
I pulled the TBI assy. off a 91 Chevy Sprint 1.0L TBI. According to my research, the injector is there should be rated at 59.15 lbs/h @ 43.5 psi... which should provide ...

Makes sense.

Thanks.