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When the engine warms up it idles really fast, the display says coolant sensor bad, replaced it, same problem

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Your coolant sensor is not getting a good ground tap into the ground side of the sensor and run a wire to the battery negative "-".

Posted on Nov 13, 2010

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92 chevy idles real fast on cold start up, then after run warming up runs fine


Not an uncommon issue for one to idle fast while cold but , 2000 rpms is a little higher than normal. May want to check the engine coolant temperature sensor for proper voltage and the coolant level. Also, check for small vacuum leaks around the throttle body gasket.

Feb 16, 2015 | Chevrolet Cars & Trucks

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High idle and no reading on temp gauge


check that there is coolant or fluid in the radiator as a coolant temp sender cannot read air as it is a vital part of the injection system for the ecu to know if the engine is cold and if sender relays no reading it is telling the ecu that it needs to ritchen the fuel mixture (possibally the reason for the fast idle) to get the engine up to normal operating temp as soon as possible.it you live in a really cold climate a thermostat that is jamed in the open position will cause it a long time to reach a warm reading. hopefully it is just the sensor wire off the coolant temp sender and by replacing it will return ever thing to normal

Mar 01, 2014 | Isuzu Pickup Cars & Trucks

1 Answer

Rev problems


good post. very good (what country or USA state?)
0F or 0C?? big difference, 0F is very very cold ,is that true?
this is international forum so do use the F or C so everyone knows.
so i bet the engine coolant temperature is out of control
on frigid days.
I use a scan tool see this engine, coolant do same its bad
The scan tool shows ECT it must rises to 180F (or more) and hold.
if not you have 2 problems, (either) the thermostat is bad, as below graphic shows. or you need to block off 1/2 the radiator with cardboard, ask any one in Canada that or Alaska.
it say thermostat is bad.
you might notice the cars heater is weaker, or if its weak all the time. not.

here is a classic bad Thermostat, slow and low.
it never reaches 180F ever.
and was insanely slow... 20miles to get this .......
the blue line is ECT (engine coolant temp sensor)
http://www.fixkick.com/my96-16v/TP-MAF-VSS-ECT-FUEL.JPG

this is just 1 step. if the coolant is at 180F or more
then you have IAC/ISC issues. if RPM is 1200 HOT, and hot is really HOT. then the ECU idle controls are INOP !
this can be 2 things, Bad ISC/IAC or fueling way wrong.
I have no idea at all what engine you have what size and cylinder count
or TOY name /num for engine???????
so can not guess which fuel system , so i stop here.

if EFI is map based, all air leaks to the plenum cause fast idle.
but i can only guess engine type.

the IAC is a thermal fast idle device, if coolant is warm, its closed.
that leaves the ISC< to control hot idle, either valve can fail.

Jan 21, 2014 | 2010 Toyota Avensis 2.0

1 Answer

Before i spend money on a maf sensor i wanted to get a second opinion on my symptoms?


Check out a new coolant sensor. Some vehicles have 2 and one works the dash gauge and the other is needed for Engine management(Fuel mix, timing). Ask at Autozone or go to Advance, or Oreilys for a second scan.
The O2 sensors control how the engine runs. Sometimes they will self-clean, but if you have a bad indication, they should be changed. I usually work on Ford brands but this is pretty universal. The scanners should also tell you which O2 is bad out of the many you may have on your car.

Oct 23, 2011 | 2001 Cadillac DeVille

1 Answer

My 91 z28 when it is cold idles very fast for to long and check engine light comes on and off intrmitingly untill warmed up can anyone help


This may be due to a bad coolant temp sensor or bad idle air control valve but i would have the computer scanned for codes, the codes will tell you why the engine light is coming on and i think thats why it idles high, the codes will help alot.

Dec 10, 2010 | 1991 Chevrolet Camaro

1 Answer

Error code po0117. Vw beetle


16501/P0117 - Engine Coolant Temperature Sensor (G62): Signal too Low Possible Symptoms
  • Difficulties with starting a cold engine.
  • Starting the engine when engine is warmish or warm, idle rpm immediately is 1200 - 3000 rpm.
  • RPM at idle is irregular.
  • With all engine temperatures seldom idle rpm will vary between 900 - 1000 rpm.
  • With engine warm (90 °C) the engine temperature suddenly drops (70 °C) and slowly comes back to 90 °C.
  • Bad acceleration during warming up.
    • Diesel: an indication is extreme long time burning time of the glow indication light.
Possible Causes
  • The electrical signal coming from G62 is too low
  • Wiring and/or connections faulty (short circuit?)
  • Engine Coolant Temperature Sensor (G62) faulty
Possible Solutions
  • Check wiring and connections
  • Check / Replace Engine Coolant Temperature Sensor (G62)
Special Notes
  • In MY 1995-2002 (?) in Europe at VW-cars the G2/G62 had the bad reputation of breaking down often. The default G2/G62 is black and all replacements are green.

Mar 21, 2010 | 1999 Volkswagen Beetle

1 Answer

The check engine light on a 2001 beetle read code PO118 engine coolant temperature circuit high input. what do i do?


16502/P0118/000280 From Ross-Tech Wiki Jump to: navigation, search Contents [hide] if (window.showTocToggle) { var tocShowText = "show"; var tocHideText = "hide"; showTocToggle(); } 16502/P0118/000280 - Engine Coolant Temperature Sensor (G62): Signal too High Possible Symptoms
  • Difficulties with starting a cold engine.
  • Starting the engine when engine is warmish or warm, idle rpm immediately is 1200 - 3000 rpm.
  • RPM at idle is irregular.
  • With all engine temperatures idle rpm will often vary between 900 - 1000 rpm.
  • With engine warm (90 °C) the engine temperature suddenly drops (70 °C) and slowly comes back to 90 °C.
  • Bad acceleration during warm-up.
  • Diesel Engines: Glow plug indicator may be on for a longer than normal time or at ambient temperatures where it shouldn't come on at all.
Possible Causes
  • The electrical signal coming from G62 is too low
  • Wiring and/or connections faulty (short circuit?)
  • Engine Coolant Temperature Sensor (G62) faulty
Possible Solutions
  • Check wiring and connections
  • Check / Replace Engine Coolant Temperature Sensor (G62)
Special Notes
  • In many cars between MY 1995-2002 the G2/G62 had a bad reputation for failing often. The original G2/G62 sensor is black and the improved replacements are green.

Jan 26, 2010 | 2000 Volkswagen Beetle

1 Answer

1995 k2500 suburban idle too fast


replace the coolant temp sensor,it`s values are off,it is defective.Also if this does not work,witch I think It will,change the throttle position sensor.

Nov 15, 2009 | 1995 GMC Suburban

1 Answer

Idles up and down after warm up


THE COOLANT LEVEL IS LOW

on the older hondas even the newer ones idle speed is coolant temp controlled.

when the engine idles up the electronic coolant temp sensor is submerged in coolant and reads warm, so the engine computer idles the car down. the coolant level if low than drops from around the coolant temp sensor and it says the engine is cold, so the engine computer idles the car up.

which results in the constant rise and fall in engine rpm.

ADD COOLANT TO THE RADIATOR AND WATCH THE CAR MAGICALLY FIX ITSELF.

Apr 10, 2009 | 1993 Honda Accord

1 Answer

1987 volvo 244 intermittent fast idle floods after shut down


The coolant temp sensor sends signal to the ECU and the ECU adjusts the idle RPM. When the coolant is cold, the engine requires more fuel to sustain idle with thick oil (oil gets thicker &amp; more viscous when cold). This makes the engine to idle at faster RPM but it should settle down to 850 RPM or so after the coolant warms up. The sensor is nothing but a thermistor; a device that changes electrical resistance according to the coolant temperature.

Apr 05, 2009 | 1987 Volvo 240

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