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Old 02-13-2010, 06:12 AM   #1 (permalink)
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Default 86 samurai smog/idle issues

I have an 86 Samurai that I am trying to get smogged and am having a difficult time. The Samurai idles rough at first and then stays at between 1650 and 1800 RPM's and the choke plate does not open all the way. We (smog tech) have adjusted the idle screw, does not lower RPM. The tech said it was the "wax element." Well, before I start messing with stuff I do not know about, I thought I'd check and see if anyone had some advice on how to lower the RPM's. I see the "wax element" referenced in the manual, but cannot even find one to get a price.
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Old 02-13-2010, 10:54 AM   #2 (permalink)
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I'm assuming you are running the stock carb... I can't help you with that... only to say I got rid of mind years ago and just dropped on a weber carb and yanked the computer.
Would do it in a heartbeat.

Has it been rebuilt? floats do go bad...
starvation issue? (pump or lines?)

thanks,
george
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Old 02-13-2010, 11:20 AM   #3 (permalink)
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you need the stock carb in california to get you through your emissions test,... so the webber option will only work for you after you pass inspection.

The wax element is on the back of the carburetor (side closest to the firewall)
There are two hoses runing to the back side, they are the coolant supply and return hoses for the carburettor. They are what the carb uses to gauge the engine temperature for hot and cold idle. There are a couple plungers on the back side of the carb as well. One is the Hot idle plunger that has the wax element in it. When it heats up the element melts and the plunger can move, it operates the same way your thermostat does. The other plunger on the back of the carb controls the Idle Up and is vacuum operated. If the vacuum supply to the Idle UP plunger is interupted the computer can't adjust the idle appropriately. The Idle Up vacuum line runs all the way forward to the front of the engine and connects to a VSV (vacuum switching valve) the vacuum supply for the VSV comes from the intake manifold just in front of the carburettor. Make sure these two vacuum lines are in tact and connected. Also make sure the electrical connector is hooked up to the front VSV. There is another plunger on the engine side of the carburetor towards the back side. It's the Choke Piston. If it's damaged or not getting vacuum, The engine can't close or opent the choke appropriately. The choke piston gets it's vacuum supply from the throttle body and had a delay valve in the line between it and the throttle body.
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Old 02-13-2010, 12:14 PM   #4 (permalink)
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upon startup the idle is supposed to be 1800. thats when the cold idle mechanism is working (thermowax unit). Turning the hot idle screw during this time will do nothing, the engine needs to be completely warm first. just an FIY
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Old 02-13-2010, 10:10 PM   #5 (permalink)
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Thanks Baratacus I will check those in the morning and let you know if it worked. I am in Ca so I do need to get it to pass smog with the stock carb, then I will hopefully switch. Thanks again.
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Old 02-15-2010, 08:34 AM   #6 (permalink)
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Idling good now. THANKS!! Not sure which one it was (I replaced them all) but it was one or more of the vacuum lines. For the most part they felt like they were good, just a couple were loose. According to the guy at Carquest who has a Samurai, they take a smaller than average sized vacuum line. Thanks again for the help, learning as I go
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