Question about Lincoln Town Car

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My 88 Linoln towncar stays on high idle and will intermittently go back to regular idle speed and then back to high idle, while driving and warmed up

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Sounds like your idle air control (IAC) valve is bad.

Posted on Feb 03, 2009

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Idle high after foot off the pedle some times. New i.a.c replace vacuum lines , clean all the ports.still does it?


Intermittent hi idle speed after engine is warm ?? 1'st;Add scan tool/ck scanned parameters,IAC % requested & so forth.....

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What can I do about high idle when engine is warm?


Is your air condition on? This will increase engine speed.
is your truck's cooling system working properly? This may increase engine speed.
is air filter clogged? Truck needs less cool dense air than warm air
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Got trouble code p0125. Car starts then idles way low then climbs back to regular idle. What is the problem?


I have a 96 Towncar, which had a P0125 trouble code set. I changed the thermostat and cleared the code - only to have it reset in a couple minutes after starting. The car was hard starting, and died several times before it actually ran. I did also noticed that while running the idle speed had risen to over 950 RPM.

I changed the Temperature sending unit located next to the thermostat housing, and again cleared the code. After starting the car again it performed excellently and did not reset the P0125 trouble code.

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1997 Olds Delta 88, 3800 engine, when started and let idle, when the engine hits about 150 degrees, it stumbles and kills. It starts back up. It has killed at freeway speeds several times. Pull off the...


electrical is the weakest link-you may have a computer with issues and before replacin a reprogram should be considered--what did vehicle scan tell you? Data recorders are often placed in cars that show no codes--Older cars can have solenoids and components that heat up and stop engine--if theres a distributer cap-inspec for corrosion

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1 Answer

1999 ford 5.4 liter v8 starts,stops for a second then goes to high idle or won't idle,when it won't idle, driving it for a while corrects no idle condition.


So you are saying for the most part that it won't idle until it gets warm? Sounds like the idle speed control motor is bad.

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Sounds like a vacumn leak. Gasket under intake plenum may be leaking. Be sure the pcv valve has the o-ring around it in the correct place also as it will set a code.

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While driving car has trouble shifting into gear , and when parked it idles to high.


Make sure high idle linkage is allowing it to kick down after it warms. otherwise back out idle screw.

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Seems like an idle speed control to me.

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