Question about 1995 Chevrolet Lumina

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The car doesnt idle properly when regular temperature is reached

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Idle control motor. bad or vacum leak.

Posted on Jul 16, 2009

  • Uriel Tello
    Uriel Tello Aug 01, 2009

    or bad temperature sensor

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Why is there an intermittent loud hissing noise from engine compartment, usually just after startup?


You just hear it better if you lower the roof or open your windows. It could just be your air intake. Unless your rpm`s are really racing to above 2500 or it is at high idle for a long time, you shouldn't kick it down. When it is cold your choke is helping to warm it up quickly. Nothing is really working properly until it reaches normal operating temperature. Let it warm up. If you are still concerned, listen under the hood for better perspective and when in doubt, take it to a professional.

Aug 09, 2015 | 2004 Chrysler Sebring Convertible

1 Answer

My 2005 equinox runs at a high temperature in idle and the heater doesn't work properly.


could be because the water doesnt seem to be circulating .... remove the pump next and check the impellar ,,,, after that if its ok i would flush out both heater rad and engine rad to clear any blockages

Dec 01, 2013 | 2005 Chevrolet Equinox

1 Answer

Car hiccups and stalls


Although your temperature gauge may show that it works, some models have a second temperature sensor for the engine management system.
That second sensor provides info which sets curb idle and timing advance. The "Cold start" feature is a part of this. The hic-cup is something of a bucking symptom as the engine controls toggle between hot and cold run settings repeatedly as water temperature is not stable.
In the past, I found several 1984 engines having defective thermostats which are tied into "Step-up" solenoids for the curb idle. What happens is idle speed is suppose to drop when the engine is hot.
When someone adjusts the curb idle while the engine is on the "cold setting", the setting(rpm) will be too low once the engine has heated up and the part drops to a hot setting.
So to clearly define your problem, you have 2 stemming from the same defects. The "in motion" problem is caused by timing changes based on temperature and the "idle" problem is caused by improper adjustment of the curb idle solenoid because of unstable operating temperature.
What you want to do is change your thermostat. This will give you a stable temperature. Then let the engine heat up and you should notice a "click" and the engine should idle down. It may stall. Then turn the idle rpm up until the engine will not stall.
The hic-cups should disappear once the operating temp is reached. If you still have problems then look for the water temperature sensors before replacing expensive parts.

May 24, 2013 | 1984 Ford Mustang

1 Answer

The temperature gauge is almost in the red but the engine isn't overheating


check your fan clutch fo proper function. if you can free spin it its bad. or take something and try to stop it while its running at operating temperature, if you can easily stop it its bad. It should stop turning within 2 seconds of turning off the vehicle, if it doesnt its bad. Also suspect a bad water pump with worn out vanes. Sounds like you dont change your coolant regular, all of this is from lack of maintanance on the cooling system. also take a temperature differential from the inlet and outlet of the radiator, anything over 40 degrees and your radiator is stopped up. Themostat etc.....

Nov 10, 2011 | 2001 Chevrolet Silverado

1 Answer

Got codes from auto zone po128 &po506


P0128 - Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature)

This means that the engine's PCM detected that the engine has not reached the required temperature level within a specified amount of time after starting the engine. The intent of the P0128 code is to indicate a faulty thermostat. Similar codes: P0125

In determining the engine did not reach a "normal" temperature, it takes into account the length of time the vehicle has been running, the intake air temperature (IAT) sensor reading, the engine coolant temperature (ECT) sensor reading, and the speed of the vehicle.

Symptoms: You will likely not notice any drivability problems other than the MIL illumination.

Causes: A code P0128 may mean that one or more of the following has happened:
Low engine coolant level
Leaking or stuck open thermostat
Faulty cooling fan (running too much)
Faulty coolant temperature (ECT) sensor
Faulty intake air temperature (IAT) sensor

Possible Solutions: Past experience indicates that the most likely solution is to replace the thermostat. However here are some suggestions on troubleshooting and repairing a P0128 OBD-II code:
Verify coolant strength & level
Verify proper cooling fan operation (check if it's running more than it should). Replace if necessary.
Verify proper engine coolant temperature (ECT) sensor operation, replace if necessary.
Verify proper intake air temperature (IAT) sensor operation, replace if necessary.
If the above items check out good, replace the thermostat
If Nissan vehicle, check for Technical Service Bulletins (TSBs), as the ECM may need to be reprogrammed to correct the P0128 code


P0506 - Idle Air Control (IAC) System RPM Lower Than Expected

This P0506 code is one that's sometimes triggered on vehicles that have electronic throttle control. That is, they don't have a regular throttle cable from the accelerator pedal to the engine. They rely on sensors and electronics to control the throttle. In this case, the P0506 DTC (diagnostic trouble code) is triggered when the PCM (powertrain control module) detects an engine idle speed that is lower than the desired (pre-programmed) RPM.

Potential Symptoms: Most likely the only thing you'll notice is the idle speed is lower than normal so it will likely be rougher. There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.

Causes: A P0506 DTC trouble code may be caused by one or more of the following:
A vacuum leak
An air restriction in the intake air path or exhuast
A faulty positive crankcase ventilation (PCV) valve
Damaged/failed/dirty throttle body
Internal engine problem
Failed PCM

Possible Solutions: This DTC is more of an informational code, so if there are any other codes set, diagnose them first. If there are no other codes, inspect for vacuum leaks, restrictions, and damage. If there are no symptoms other than the DTC itself, just clear the code and see whether it returns.


Check it, and keep us updated.

Apr 20, 2011 | 2004 Ford F150

1 Answer

Engine light is on. had it scaned and it said that it could be low on coolant, checked that and it was fine. it said it also could be the thermastat or the coolant temp sensor. thermastat seems to be...


the electric fan will only come on if the coolant temperature is 200-210 degrees. if your car doesnt ever reach 200 then yes you have a bad thermostat. if it does reach high enough to turn on cooling fans then yes your temp sensor is bad.

Feb 22, 2011 | Chevrolet Aveo Cars & Trucks

1 Answer

Engine shakes and doesnt respond effectively


I am guessing the shaking is coming from it not idleing properly. Have you tried a tune up yet?

Nov 12, 2010 | 1995 Ford F150 Styleside Regular Cab

1 Answer

99 passport 4x4 tranny question


There is not a dipstick for the automatic transmission on the 1999 Honda Passport. There are two plugs on the bottom of the transmission - the lowest one is the drain plug and the one located higher is the overfill plug. You should have a fluid temperature gauge as it is recommended that the temperature be between 90* F and 135* F when checking fluid level. (I believe you can order from dealer - I have also heard that running the engine for 10-15 min will put you near the proper temperature - to be certain, the temperature gauge is the right way to do it.) Run engine for a few minutes to reach optimum temperature. The vehicle must be on level ground and at idle to properly check fluid level. With proper temperature reached - and engine running at idle - set parking brake - remove the fill plug and add fluid with a syringe or small pump until it just starts to run out of the opening. Do not open the overfill screw with the engine stopped. Replace the fill plug and shift through gears - then remove and repeat one time to achieve proper level.

Jan 17, 2009 | 1999 Honda Passport

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