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1990 lincoln town car 5.0 excessive idle, low then high, changed the idle control twice, change cap rotor ,wires stumped

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Have you check the throttle position sensor

Posted on Mar 22, 2011

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1990 gmc pickup 350 eng rough idle and idles a little high then low new cap rotor wires plugs


Chexk everything and then recheck. I have seen brand new caps bad right out of the box. Also check for any danged pkuga. I've Seen Those CRACKED New Out THE Box.

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Tune up 1988 Lincoln Towncar


you need: spark plugs, spark plug wires, depending on if newer system that is all. if it is older you will also need rotor cap and rotor button. label the plug wires and change one plug and corosponding wire at a time after changing the (cap and button).make shure the plug wires go on the new cap in the same order that they came off.

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2001 chevy malibu idles anywhere from 1500-2500 rpm then sputters and dies while driving.


I'LL TRY, GOOD TO SEE SOMEONE TRY AT LEAST ! IDLE SEEMS HIGH, BACK TO BASICS !!!!!! THE AIR & FUEL FILTERS NEED REPLACED, SPARK PLUG WIRES, YOU FORGOT THEM !!! DISTRIBUTOR CAP & ROTOR, YOU FORGOT THEM !!! THESE ARE AS IMPORTANT AS THE AIR WE BREATHE !!!!! VACUUM LEAKS, CHECK ALL VACUMM LINES, THOROUGHLY ! THIS LINE COMING OUT OF THE TRANSAXLE PORTION OF THE INTAKE MANIFOLD ?????????????????/ YOUR NEED TO REPLACE WHATEVER IT IS, WHAT KIND OF LINE ? METAL, RUBBER , WIRE ??? MOVING ON, GOOD YOU REPLACED THE OXYGEN SENSOR, & IDLE AIR VALVE, & TPS, RECHECK TPS, IS IT LOOSE, ALSO TIGHTEN THROTTLEBODY BOLTS, THE ONES THAT HOLD IT DOWN. SO, CHANGE YOUR FILTERS,WIRES, ETC., MENTIONED ABOVE, CAP & ROTOR, ETC.,ETC.,.........GO FROM THERE, SEE HOW THAT WORKS

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1 Answer

I have a 1990 dodge dakota 3.9 liter v6...idles rough and stalls out at stopping...i have changed cap rotor plugs and wires...and also the throttle positioning sensor...no change..any ideas would be...


Do the service below.

Engine stalling and rough run issue at low speeds

This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control. If this doesn't improve the problem you have mechanical problems in the engine like a low cylinder die to worn rings or leaking valve seats.



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1 Answer

1990 lincoln town car 5.0, hard to start then


air idle control motor probably sticking remove motor and spray w-d-40 inside then reinstall and tap with a hammer while running

Dec 07, 2009 | 1990 Lincoln Town Car

2 Answers

Cranks but no start


Sounds like the carb is dirty. I would check that before spending a lot of money of other things.

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Idle high to low


try cheking your timing

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My 1990 lincoln mark VII is pulsing


check the idle air bypass solenoid,take off and clean or spray out with carb cleaner.

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