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Old 05-17-2011, 05:46 PM   #1 (permalink)
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Default 1986 Samurai - cold idle

I have a 1986 Suzuki samurai that I purchased recently. The idle was way high so I adjusted the timing and then set the idle correctly. When it is warm, it is now smooth as glass and pulls well. The problem is when it is cold. Then I have to sit with my foot on the gas until it warms up or it will stall. Where is the cold idle set and how do you adjust it?
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Old 05-18-2011, 07:26 AM   #2 (permalink)
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Edmund,
Set the idle to spec when warm 1st, then set the timing to spec. Don't try to set the idle by adjusting timing.
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Old 05-18-2011, 09:21 AM   #3 (permalink)
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On the passenger side of the engine just in front of the throttle cable mount is the screw. Use a flatblade screwdriver to adjust. It is right above the rear nut that holds the carb on.
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Old 05-18-2011, 01:18 PM   #4 (permalink)
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Default Just cold

I am sorry I wasn't clearer with my problem. Right now, the motor is set to 8 degrees BTDC timing and idles at 800 RPM when warmed up. BUT - it will not idle when cold and stalls. The choke seems to be working OK. If I use the idle adjust screw to set the cold idle to something reasonable, then the warm idle becomes > 1300 RPM and it is then hard to shift into gears. Is there a carburetor setting / adjustment for a cold "fast idle"?
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Old 05-18-2011, 11:21 PM   #5 (permalink)
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there is no cold idle adjustment screw. Turning the idle adjust screw adjusts the throttle at both hot and cold idle. The only way to adjust the cold idle is to bend the flange that the cold idle plunger pushes on. (cold idle plunger is the wax pellet plunger on the back of the carb that has the coolant hoses runinng to it) If you bend the flange that the plunger pushes against, it will increase the idle speed when cold. This should not interfere with hot idle speed.
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Old 06-06-2011, 03:20 AM   #6 (permalink)
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Default Samurai Cold Idle

I'm an electronic engineer, not a mechanic, so forgive me if I speak below your level. My Samurai idled fine when warm, but would idle up (embarrassingly) high while it was cold, then back to normal after just a few minutes and increased engine temperature. Sounds to be the opposite of your problem, but may be the same parts in play. Here's what I did for my 1988, 1.3L SOHC 8-valve carbureted engine:

The stickers under my hood are still ledgible and give the following specifications:
Idle Speed: 800RPM
Ignition Timing: 10 BTDC/800RPM

I have my engine set at 800RPM using the idle speed adjusting screw located on the passenger side of the carburetor. If this does not fix your problem (sounds like you already tried this), then I would still verify your choke adjustment:
1. With engine cold, remove air intake case from carburetor
2. Verify clearances between choke plate & carburetor bore (.004-.023in @ 77; .05-.11in @ 104) if out of tolerance, try to verify movement/lubricate choke linkage and take another measurement.
3. If clearances between choke plate & carburetor bore remain out of tolerance, remove the carburetor and adjust the choke lever by the following method:
-Remove the idle-up actuator, turn the fast-idle cam counter-clockwise and insert a pin/rod into the cam and bracket to hold into place.
-Bend the choke lever up or down until the choke-to-bore clearance is in tolerance (up = close; down = open).

If this doesn't work, I'd check the fast-idle and idle-up adjustment. Let me know if you need to know how to do that.

Last edited by RStorman; 06-06-2011 at 03:51 AM.
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Old 06-06-2011, 10:15 AM   #7 (permalink)
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Two sites that can really help with the Samurai;


Ack's FAQ Site Map

.:Suzuki Download Archive:.

Here is an explanation with pics of the idle adjustment;
http://suzukiinfo.com/sierra/idlespe...nt-hitachi.zip
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