Question about 1986 Toyota Pickup 4WD

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Rough idle and hesatates about half throttle - 1986 Toyota Pickup 4WD

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I would check your plugs, cap, rotor and wires first. If they all look good your carborator may be bad. Dirty jets or clogs in the fuel system could be starving the engine of fuel and your accelerator punp in the carb could be bad.

Posted on Oct 03, 2009

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Throttle body stuck, rough idle


Have you cleaned the throttle body bore and plate of carbon/deposits ? This can cause idle and off idle symptoms .

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I would check the throttle body, where the fuel mixes with the air also clean all pipes/connections etc after that you should know where to go next, but give the "plate" inside where fuel and air mixes, carb

Jun 11, 2013 | Chevrolet Malibu Cars & Trucks

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1993 ford escort automatic 4cylinder idles rough occasionally. No check engine light I just need advice on what it may be it runs excellent once I put it in gear and go


This is often caused by hard engine mounts and a dirty idle speed control valve and throttle valve. Clean the intake following these instructions, that should improve the idle issue.
Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes.

Feb 21, 2012 | 1993 Ford Escort 4 Door

1 Answer

When idleing once in a while it starts running rough and shaking truck, 1998 k1500 350. no engine light. when i gige it gas it smooths right out. engine seems like its a little louder than normal.


Here is the common cause of surges, cold stalls, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours.

To correct this problem Buy a can of throttle valve cleaner (it is made by CRC) from the local auto parts store, NEVER USE CARB CLEANING SPRAY, IT DESTROYS THE ANTI-STICK TEFLON COATING, spray it into the air intake through the throttle body of the engine until you have used about half the can, you will need to hold the idle up while you do this, it will try to stall, after this shut the engine down and disconnect the Negative (-) battery cable for 5 minutes. The intake is now clean, if you continue to have the idle speed control problems you may need to seek the help of a professional.

Feb 13, 2012 | 1998 Chevrolet K1500

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Blowing black smoke and hesatation on accelration replaced lower and up in take gaskets maf and iac and crak postion sensor changed all the plugs it is not showing any codes now but blowing black smoke and...


NEW CRANKSHAFT POSITION SENSOR HAS TO BE REPROGRAMM.PROBLEM IS THE CRANKSHAFT SENSOR COULD HAVE INTAKE GASKET LEAK OR FUEL INJECTOR SEALS LEAKS WILL CAUSE ENGINE ROUGH IDLE SMOKE BLACK.

Sep 06, 2011 | Pontiac Bonneville Cars & Trucks

1 Answer

Hesatation and rough idle


Hi, your Car needs a tune up. Have the spark plugs replaced a fuel injector cleaner added to the fuel tank and replace the air filter if it needs it. Change the oil and filter at least every 5,000 miles also. I believe by having these services done your rough run will be gone...

Jul 24, 2011 | 1998 Plymouth Neon

1 Answer

The vehicle idles rough. Also had a few codes


Try cleaning TAC valve, spray throttle body cleaner in upper right of opening clean well.

Mar 10, 2010 | 1999 Chevrolet Silverado 1500

1 Answer

Throttle body just replaced; now runs & idles rough


adjust the TPS, throttle position sensor.

First though, disconnect battery for 1/2 hour. Restart engine and drive for 15 miles while computer relearns changes you made. Will run rough for this period.

Apr 25, 2009 | 2005 Nissan Quest

1 Answer

Carb adj F-150 1985 1 barrel


U are not describing a carb adjustment issue but a carb dirt issue or an intake manifold leak or the base of the carb is loose (very,very common), twist the carb body if it moves the base of carb has come loose, but back to the adjustments, set the rough idle speed to spec, then turn the mixture screw out about 3 1/2 turns, then turn slowly in while you watch a hand held tach, when the eng reaches its maxium idle speed the mixture is correct, then turn it in 1/3 more to pass smog and maximize fuel economy, then set the final idle with the idle speed screw, also verify the dash pot works so the throttle closes slowly when you raise rpm, if the little decel dashpot is no good replace it.

Apr 10, 2009 | 1985 Ford F150

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