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Vitara G16B variants - haalp!
https://www.auszookers.com/forum/viewtopic.php?f=5&t=57819		 Page 1 of 1
Author:  Beery [ Sat Jan 11, 2025 4:05 pm ]
Post subject:  Vitara G16B variants - haalp!
I'm currently in the process of scratching together all the bits I need to put a Vitara g16B in my sierra. I haven't got very far and have hit my first snag. I was just checking over the engine and loom I have and have discovered I'm "missing" a plug for the ISC (idle speed control)

The donor Vitara I have is a very rough, paddock basher example. The engine number doesn't match up with the car, so it's had an engine at some point, and I think it's a different variant.

Here's my engine and its intake manifold, and another manifold I had laying around. The manifold on my engine has the ISC (brown plug) right near the throttle body, just under the TPS.
Image

Image

The second manifold I have has it further towards the front (Blue plug)

Alos, does anyone know if that white plug that branches off the TPS loom is used for anything? it's not plugged into anything on either manifold, and i can't find a matching plug in the loom.

Image

anyway, The loom that came out of the Vitara has the blue plug, so I'm wondering if I can just swap the manifolds over and everything will be sweet?

Image

As far as I can tell the rest of the loom fits up fine, and the car did run before I pulled the motor.

The vitara is a march 94' model. I'm not sure when they started EFI, but my suspicions are I have an earlier variant engine.

Also, if anyone can direct me to a factory service manual for a vitara, or even just the wiring diagrams that'd be awesome. i can't seem to track the right one down.
Author:  fordem [ Sat Jan 11, 2025 9:58 pm ]
Post subject:  Re: Vitara G16B variants - haalp!
As far as I know the 16v engines have always been fuel injected - try http://www.rhinoman.org/manuals/vitara/vit_manuals.html for manuals, and be aware that Suzuki released supplements to cover the changes as the went along, so there is no one single manual that covers everything - just grab the entire lot and then search through them.
Author:  Beery [ Sat Jan 11, 2025 10:28 pm ]
Post subject:  Re: Vitara G16B variants - haalp!
that's my understanding. I wasn't sure when they were released though - After some research, I believe it was 92' ish, which I think my engine is probably around that era, but my loom/comp is 94' and some changes were made between the two.

I did find that lot of manuals, but I don't think there's any that are an exact match. Different ECU plug layouts, distributors, wire colours etc... There's one that's probably close enough to get me through though.

I'll have more of a play around and report back. I think swapping the intake will get me out of trouble.
Author:  Gwagensteve [ Sun Jan 12, 2025 7:13 am ]
Post subject:  Re: Vitara G16B variants - haalp!
I don't have time to put much time in - sorry, a lot going on ATM but there are a number of variants of G16B.

Earliest release of the G16B was ~1991 with the LWB vitara and swift sedan.

Yes, the engine on the right with the EPI badge on the inlet is a very early engine. 94 was the changeover when the SWB's also received the G16B and there are a number of electronic differences - not only to the IAC but also the distributor/ignitier/coil and the AFM.

My suggestion would be you'll need to have the engine variant, loom and computer to match or you'll drive yourself mental trying to get everything to work.

I'm not across the timing of each change and the FSM's will be a bit of a challenge. Prior to all Vitara's being EFI, there was an overall FSM covering the SWB cars, 8V carby and trimatic auto, then a supplement for the LWB model which included the AW-4 and 16V. I only have these manuals which doesn't cover the later engine variant.

I suspect that once the SWB's went EFI the manuals were merged.
Author:  sideways [ Mon Jan 13, 2025 12:18 pm ]
Post subject:  Re: Vitara G16B variants - haalp!
The series 1 and series 2 vit G16bs share very little in terms of sensors and wiring but there's no fundamental change to the motor that means you can't run an S1 with an S2 management system or vice versa provided you swap everything with a plug on it. I'd absolutely run the S2 system, you can't buy much in the way of parts/sensors for the S1.

S1 = 2 wire dizzy, mechanical AFM
S2 = 3 wire dizzy, hotwire AFM
Author:  Beery [ Mon Jan 13, 2025 4:29 pm ]
Post subject:  Re: Vitara G16B variants - haalp!
Thanks for the info guys. Thanks a bunch for those diagrams, sideways! That full Vitara diagram is lining up pretty much perfectly with the harness I have here.

So, my distributor is a 3 pin:

Image
Image

And I have two AFMs here, both 3 pin hotwire variants:

Image

The one on the cast crossover pipe is the one that was on the car. I think this is off a series 2 as it has the hose port for the series 2 idle control valve (?) so there's definitely been some swapping of parts.

So I'm assuming the previous owner has swapped over the distributor and AFM (maybe some other bits and pieces) to get the series 1 motor running off of this series 2 loom. Obviously they haven't swapped the intake manifold over, but maybe they weren't too concerned about having idle control in a farm car, so didn't bother. To be clear, the car did run. I was driving it around my yard. It ran a bit rough, but it has some pretty wild ignition leads/ stale fuel/ who knows what the plugs are like etc. etc..

Anyway, if I swap the intake manifold over, that means every plug in the loom will be accounted for, and will all plug in. The only questionable plug is the white one that branches off the TPS, but I believe that's for EGR, which this engine isn't equipped with.

This engine/loom doesn't owe me anything, so it's not the end of the world if i have to abandon the idea of using it, but it's looking like this could work?
Author:  Beery [ Mon Jan 13, 2025 8:16 pm ]
Post subject:  Re: Vitara G16B variants - haalp!
My comments on the EGR weren't worded very well. the engine does have EGR and the associated valve/wiring at the front of the intake.

I thought I read in a manual yesterday that some markets have an EGR solenoid/stepper motor or something up near the TPS and the wiring may be for that. Can't find it now. Anyway, it's blank in the diagram sideways provided, and I've been scouring g16B engine bay photos and it seems it's left unplugged (at least in our market), so I'm not too concerned.
Author:  sideways [ Tue Jan 14, 2025 1:58 pm ]
Post subject:  Re: Vitara G16B variants - haalp!
Beery wrote:
but it's looking like this could work?


Looks like a winner to me!
Author:  Beery [ Wed Feb 12, 2025 8:19 pm ]
Post subject:  Re: Vitara G16B variants - haalp!
success!

Image

Update in my build thread.
Author:  Sausager [ Thu Feb 13, 2025 4:58 am ]
Post subject:  Re: Vitara G16B variants - haalp!
Tiiiiiidy mate, very nicely done
Author:  Gwagensteve [ Thu Feb 13, 2025 9:40 am ]
Post subject:  Re: Vitara G16B variants - haalp!
Neat intake setup.
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