Question about 1989 Mercury Tracer

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Stalls when idling low. When I take my foot off of the gas, car stalls.

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Possible need throttle body cleaning and/or air by-pass valve replaced

Posted on Feb 05, 2010

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1 Answer

Car stalls when foot off gas pedel does not hold idle


these trucks are equipped with an idle speed control motor. What you're describing sounds like that part has stopped working. The part is designed to maintain idle when gas pedal is released. Now if you hear an audible hissing noise under the hood, then theres a vacuum leak which can cause the same problem, but it sounds like the idle control motor. Good luck.

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Will a bad gas cap make my 2003 taurus idle bad and then stall


No it won't ,it has an Idle control valve that isnt working or the idle is set to low or the throttle body is gummed up ,clean the throttle body
replace the iac vavle and you should be ok

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Car stalls after warm on hot day after a few stops. will stall when stopping at intersections, and when taking foot off the gas going down hills.


The idling setting in the car is not set correctly or the idling is LOW due to fault in the setting.
You will need to check if the throttle position is correct and the idle setting WITH THE CLUTCH PRESSED must be of the CORRECT IDLING RPM. If not reset the position after cleaning the system.

Aug 09, 2011 | 2002 Ford Taurus

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Car will not start without pressing gas pedal to keep idle speed up. If I keep idle at 900 RPM or higher it runs as long as foot is on gas pedal. It then stalls out when I take foot off gas pedal. No...


Have the idle bypass valve checked, also called idle air control valve.
If that valve is stuck in the closed position, it's not allowing the fuel to bypass the throttle plate to keep it idling, resulting in stalling, but will keep engine running if the pedal is pushed down.

May 14, 2010 | 2000 Toyota Camry Solara

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Car idles low, stalls after start


Common issue at the shop (i'm a ford technician), here is what I do to correct it.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Mar 11, 2009 | 1999 Mercury Cougar

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