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Old 07-10-2014, 06:03 PM   #1 (permalink)
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Default G13b carburetor running issue

I've recently purchased a g13b sohc motor and successfully installed into my 85 samurai. I've got it running but it has a slight stutter/miss at idle (kinda sounds like it has race cams installed). Guy I bought it from said it runs good but just a little rich, and I can tell it's rich by the smell of the exhaust. Ive looked everywhere on the carb and can't seem to find any name or serial number anywhere on it, only serial I can find is "k5t547" which is on the egr valve.

My questions are what carburetor do I have? And there are 3 vacuum lines that I do not know where they go, only thing I can think they'd connect to would be a charcoal canister but I don't have one, so can I just cap those hoses off (labeled in picture as 1 2 3)? Also the egr valve pushes air out of it, so what hose connects to it(which is circled in a picture)? And last question, is number 4 the electric choke? I believe it is because I can turn/move the levers and the butterfly valve moves but when trucks running it's wide open at cold and running temperature
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Old 07-10-2014, 06:05 PM   #2 (permalink)
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Here is picture of the carb
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Old 07-12-2014, 05:26 PM   #3 (permalink)
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The SOHC is a G13BA engine used in the following:
1989 Suzuki Sidekick
1994–2000 Maruti Esteem
1994–2004 Subaru Justy
1989–1997 Suzuki Swift
1992–1997 Geo Metro
1990–1995 Suzuki SJ413
1989–1993 Holden Barina

If you are attempting to operate without the appropriate donor car OEM ECM, you are in a word - hosed! The carburetor equipped engines of that engine series are hybrid electronically controlled carburetors that require the OEM sensors and ECM to properly function.

I would strongly recommend using your original carburetor, or a rebuilt equivalent for which you have the proper ECM.
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Old 07-12-2014, 08:10 PM   #4 (permalink)
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Well it seems to run fine other than the choke not working, and having those 3 vacuum lines leading to know where and the egr blasting into the air. But I'll look into getting the oem ecu, is there an id number for the ecu incase the guy I bought it from doesn't have one? The motor did come from a samurai
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Old 07-12-2014, 09:52 PM   #5 (permalink)
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Was just talking to the guy and he said it's an 87 and it was running good when he had it, he doesn't think there's an ecu that he had for it (he just swapped in a vw diesel so he would of found out if he had an ecu for the g13b) and on the block the branding was g13b, if it was a g13ba wouldn't it say so?
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Old 07-13-2014, 12:39 AM   #6 (permalink)
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The 87 Samurai has an ECM and that controls the very complex carburetor used on those models. See the Petroworks.com site for details on the carburetor and for the ECM.
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Old 07-13-2014, 12:12 PM   #7 (permalink)
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From all my research, the carburator that's on it right now isn't the stock carburetor, there is also no plugs or wires coming from the carb that would go to a ECM, only plugs on the whole engine are already connected to something that goes to either the instrument cluster or it's for ignition purposes. But there is 2 plugs that don't connect to anywhere, ones underneith the thermostat housing and other is a o2 sensor
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Old 07-13-2014, 09:37 PM   #8 (permalink)
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Sounds like you have a mystery project. Start with the manual for the engine and vehicle and do the research. The manual is very comprehensive and depicts all the sensors, the wiring harness, the ECM, and has a full diagram of the vacuum and emission control systems. Matching an emission engine to an older non-emission vehicle can be rather daunting and may be impractical from a cost standpoint.
The fact you have found an oxygen sensor tells me this is an engine that uses the hybrid carburetor, and it likely just has something someone stuck on it to get it out the door if there are no corresponding control connections on the carb.
If the oxygen sensor is not functioning you will poison the catalytic converter if the carburetor does not lean out when it is at operating temperatures. That can lead to an unsafe overheating of the cat and/or vehicle stalling. The carb running rich can also lead to carbon build up in the engine and damage from that, or lean operation can lead to melted pistons or broken compression rings. All of which are expensive issues.
On option would be to match all the components to the year model that the engine is supposed to be, and then get the correct carburetor and ECM. I suspect that would run you around $1,200, plus shipping and your labor, by the time you scared up the correct wiring harness and all the sensors that may be required.
Subaru used a version of this engine in their short lived Justy, and your carburetor looks vaguely like one of the Hitachi units they used. Unfortunately, that was a junk carb that had so many problems it was simply manufacture discontinued.
What I would do, if there were no worries about emission or pollution control equipment inspections, is remove the cat, not worry about any sensors other than the usual engine temp and oil pressure senders, and then go shopping for a Weber carburetor conversion for the engine. The cost of that is around $380, and the Weber is a quality carburetor that is easily tuned and can be rebuilt by just about anybody with reasonable mechanical skills when the time comes.
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Old 07-13-2014, 09:54 PM   #9 (permalink)
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Will do, I was just thinking about saying screw this carb and ordering a weber. I don't have a cat on it either. Just had the motor at operating tempurature for about 5-10 minutes and noticed a strong odour of fuel in the exhaust and motor tried to big down and die for the most of the time at operating temp. I also was noticing a difference of smoke coming from the exhuast, was usually a kind of smokey off coloured blue but once it was operating tempurature and try's to bog out, when I hit the throttle it does a semi hesitate/stutter and puffs out some smoke that has a black ish color (can barely see any smoke coming from tailpipe but the smoke is more lingering around the vehicle like above and behind which still has to be from the exhuast obviously.

I'm not one to really give up on something so I'm still going to try and mess around with it so if there's any other advice on what it could be or help with it would be greatly appreciated. But in the end I probably will buy a new carb for it thank you Randy
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