My toyota 3f engine runs fine but wont idle - 1986 Toyota Land Cruiser

Vacuume leak is very probabe, check vacuum hoses for leaks, gasket leak at intake manifold or throttle body etc. I like to use starting fluid and spray around a bit. If you spray it on a vacuum leak, your rpms will noticably go up.

check that the idle solenoid shut off needle is connected . It is used to stop engine run when the ignition is turned off. If it is not connected the idle circuit of the carby will not function and the engine stops.

Idles rough and quits when gas pedal is pressed less?
http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html
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Rough idle, staling and Erratic shifting?

http://technoanswers.blogspot.in/2012/03/rough-idlestaling-and-erratic-shifting.html

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Its a hot start issue.

Can be related to low fuel pressure or problem with crank sensor.

Also it can be weak battery or starter.

But possibilities are to be inspected to confirm what exactly it is.------

To troubleshoot and confirm the issue,i suggest you refer few solved help links with similar types of problem like yours:------

Click the link below:------

1991 Toyota Trecel: Engine Starts fine but dies when gets Warm?

http://whatisbyme.blogspot.in/2012/05/1991-toyota-trecel-engine-starts-fine.html

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1994 Toyota Pickup: Starts fine but dies in few seconds?

http://howtobyme.blogspot.in/2012/05/1994-toyota-pickup-starts-fine-but-dies.html

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1995 Lexus LS400: Running Hot?

http://whatisbyme.blogspot.in/2012/05/1995-lexus-ls400-running-hot.html

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2002 Toyota Camry: Puff of Blue or White Smoke while Starting?

http://whatisbyme.blogspot.in/2012/05/2002-toyota-camry-puff-of-blue-or-white.html

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Multiple problems on car: Car runs hot, A/C blows hot and car starts surging?

http://schematicsdiagram.blogspot.in/2012/04/multiple-problems-on-car-car-runs-hotac.html

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Delay starting on Toyota Prius?

http://schematicsdiagram.blogspot.in/2012/02/delay-starting-on-toyota-prius.html

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Honda car will not start intermittently?

http://technoanswers.blogspot.in/2012/02/honda-car-will-not-start-intermittently.html

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Vehicle Starts, Runs and Loses Power

http://whoisbyme.blogspot.in/2012/07/vehicle-startsruns-and-loses-power.html

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Intermittent starting issues on Volvo 760?

http://schematicsdiagram.blogspot.in/2012/02/intermittent-starting-issues-on-volvo.html

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Car starts and cuts off immediately?

http://repairhelpcenter.blogspot.com/2012/01/car-starts-and-cuts-off-immediately.html

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Car won't start when cold?

http://schematicsdiagram.blogspot.com/2011/12/car-wont-start-when-cold.html

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These details will help.

Thanks.

There re few possibilities that can cause no idle issues.To troubleshoot the issue help links are provided below.Click the link below:---
Idle Problem? http://whatisbyme.blogspot.in/2012/05/2001toyota-corolla-idle-problem.html
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Idles rough and quits when gas pedal is pressed less? http://technoanswers.blogspot.in/2012/01/1999-ford-f-150-idles-rough-and-quits.html-----------
Stumbling and stalling at idle after engine rebuild? http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html

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Cooling fan Shuts OFF and Idle Drops? http://howtobyme.blogspot.in/2012/05/toyota-celica-cooling-fan-shuts-off-and.html

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Rough Idle and Vibration? http://whatisbyme.blogspot.in/2012/05/2006-ford-f150-rough-idle-and-vibration.html

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Steering Wheel Vibrates at Idle? http://whatisbyme.blogspot.in/2012/05/1993-toyota-corolla-steering-wheel.html

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Runs Fine But Idle Is Low? http://whatisbyme.blogspot.in/2012/05/2004-toyota-highlander-runs-fine-but.html

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Vehicle Will not hold Idle? http://whatisbyme.blogspot.in/2012/05/2003-lexus-es300-vehicle-will-not-hold.html

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Engine Idles Rough and Dies? http://whatisbyme.blogspot.in/2012/05/1994-lexus-es300-engine-idles-rough-and.html

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This will help.
Thanks.

Get the Idle air control valve checked inspected.Also its suggested to get more troubleshooting done.For more troubleshooting,click the help,links below:---Idle Problem? http://whatisbyme.blogspot.in/2012/05/2001toyota-corolla-idle-problem.html
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Runs Fine But Idle Is Low? http://whatisbyme.blogspot.in/2012/05/2004-toyota-highlander-runs-fine-but.html
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Vehicle Will not hold Idle? http://whatisbyme.blogspot.in/2012/05/2003-lexus-es300-vehicle-will-not-hold.html
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Erratic Idle and Intermittent engine stalling? http://technoanswers.blogspot.in/2012/04/1997-toyota-camry-erratic-idle-and.html
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Stumbling and stalling at idle after engine rebuild? http://schematicsdiagram.blogspot.in/2012/03/stumbling-and-stalling-at-idle-after.html
---------Cooling fan Shuts OFF and Idle Drops? http://howtobyme.blogspot.in/2012/05/toyota-celica-cooling-fan-shuts-off-and.html
-------Rough Idle and Vibration? http://whatisbyme.blogspot.in/2012/05/2006-ford-f150-rough-idle-and-vibration.html
--------Steering Wheel Vibrates at Idle? http://whatisbyme.blogspot.in/2012/05/1993-toyota-corolla-steering-wheel.html
--------This will help.Thanks.

moving the distributor will alter the idle because it makes the engine run easier or harder

Forget the idle and set the distributor at 10 degrees BTDC
now that the timing is correct then adjust the idle speed at the idle screw on the carby

From your description, most likely there is a problem with the Idle Air Control (IAC) valve. Its job is to open at idle to let air in when the throttle is closed. Either it is clogged, or it has gone bad. You will need to remove it and clean it, or replace it. It is bolted to the rear of the intake manifold. When you remove it, try starting the engine with the valve removed so air can get in the intake. If the engine idles ok, you'll know that the IAC was causing the problem.

Another possibility is a leak in the vacuum system. With the engine running, listen closely for any tell-tale hissing sound. Inspect all the vacuum hoses and the air intake duct, and repair as needed.

22r-E, 3vz-E And 3f-E Engines

1. Warm up the engine, then turn it OFF. Connect a timing light to the engine following the manufacturer_s instructions.
   
2. Connect a tachometer to both battery terminals. Connect the tachometer probe to the IG-terminal in the check connector box. The check connector box is located next to the underhood fuse and relay box on trucks and 4Runner's; for Land Cruisers, the check connector box is on the firewall. Use the correct adapter to insure a tight fit on the terminal. Not all tachometers, particularly older ones are electrically compatible with this system. Read instructions for your unit before using.
   

Attach the tachometer as shown

3. Start the engine and run it at idle. Check the idle speed on the tachometer; adjust it to specification if necessary.

4. At the check connector, use a small jumper wire to short the connector at terminal T or TE1 and terminal E1, of the DLC1 as shown. Special service tool (SST) 09843-18020 or its equivalent can be used for this also.



Connect the SST or jumper wire to the TE1 and E1 terminals of the DLC1

This jumper will be used repeatedly during diagnostics in later sections. Take the time to make a proper jumper with correct terminals or probes. It's a valuable special tool for very low cost.

1. Check the idle speed, then check the ignition timing. The 22R-E should read 5° BTDC, 3VZ-FE should read 10° BTDC and the 3F-E should read 7° BTDC. All of these readings are at idle.
   

On 3-FE engines, remove the rubber plug at the rear of the engine to view the timing mark



On other engines, the timing mark is visible on the crankshaft pulley

1. Loosen the distributor pinch bolt just enough that the distributor can be turned. Aim the timing light at the marks on the crankshaft pulley (or the drive plate on 3F-E) and slowly turn the distributor until the correct timing mark aligns with the pointer. Tighten the distributor pinch bolt.
   
2. Remove the jumper wire or special service tool (SST) from the DLC1.
   
3. Check that the ignition timing advances. At idle the 22R-E should read 10°-14° BTDC, 3VZ-FE should read 8° BTDC, and the 3F-E should read 12° BTDC.
   
4. Shut the engine OFF and remove the timing light and tachometer leads.
   

pre ignition could mean it runs after you turn the key off that would be to high mechanical setting of the idle speed by changing the throttle plate factory setting if you did that to keep it idling turn it back down and find out what that problem is because the idle speed isto high. if this is not the issue,either the timing is incorrect or more than likely the computer is not compatable with this different engine.have fun.

i would check the egr valve sounds like its sticking.