Question about 1996 Nissan Maxima

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Engine Temperature rises, all fluids are full, w/no leakes.

After the car runs for about 15-20min. The temperature guage reads high. The car does not show the signs of overheating, but the gas pedal does get harder to press when accelerating.

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  • Nissan Master
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Replace thermostat.feel top radiator hose and bottom radiator hose if they both should be hot 10-15 minutes.if not replace thermostat.

Posted on May 11, 2009

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3 Answers

P0128 (and P0116) on 2006 GMC Sierra v-8, 5.3L, 4x4. Originally getting low temp readings on guage. After replacing the thermostat, the problem seemed to be fixed. A few days later, I was getting my...


P0116 - Engine Coolant Temperature (ECT) Circuit Range/Performance Problem
The ECT (Engine coolant temperature) sensor is a thermistor which changes resistance based on temperature of the coolant in contact with it. The ECT sensor will be located in the block or coolant passage. Usually it is a two wire sensor. One wire is a 5 Volt supply from the PCM (Powertrain Control Module) to the ECT. The other is a ground to the ECT.

As the temperature of the coolant changes the resistance on the signal wire changes accordingly. The PCM monitors the reading and determines coolant temperature in order to perform essential engine fuel management. When engine coolant is low, sensor resistance is high. The PCM will see a high signal voltage (low temperature). When coolant is warm, the sensor's resistance is low and the PCM will see a high temperature. The PCM expects to see slow resistance changes on the ECT signal circuit. If it sees a quick change in voltage that isn't consistent with an engine warming up, this P0116 code will set. Or if it sees a lack of change in ECT signal, this code may set.

Symptoms: There may be no noticeable symptoms if the problem is very intermittent, however the following may occur:
MIL (Malfunction Indicator Lamp) illumination
Poor drivability
Black smoke at tailpipe
Poor fuel economy
May not idle
May exhibit stalling or misfires

Causes: Potential causes of the P0116 code include:
Missing or stuck-open thermostat
Bad ECT sensor
Short or open on signal wire
Short or open on ground wire
Poor connections in wiring

Possible Solutions: If there are any other ECT sensor codes, diagnose them first.
Using a scan tool, check the ECT reading. On a cold engine, it should match the IAT reading or should be equal to ambient (outside) temperature reading. If it does match the IAT or ambient temp, check the freeze frame data on your scan tool (if equipped). The saved data should tell you what the ECT reading was when the fault occurred.

a) If the saved info indicates that the engine coolant reading was at the coldest exreme (around -30 deg. F) then that's a good indication the ECT resistance was intermittently high (unless you live in Anchorage!) Check for an open in the ECT sensor ground and signal circuits and repair as necessary. If they appear okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.

b) If the saved info indicates that the engine coolant reading was at the warmest exreme (around 250+ deg.F) then that's a good indication the ECT resistance was intermittently low. Check for a short to ground on the signal circuit and repair as necessary. If it appears okay, warm the engine up while monitoring the ECT for any intermittent jumps high or low. If there are replace the ECT.

Other ECT sensor and circuit related DTCs: P0115, P0117, P0118, P0119, P0125, P0128
--------------------------------------------------------------------------------------------------------------------

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



These codes are telling you that the engine temperature is not sufficient. This can be caused by a faulty coolant sensor,air in the cooling system,or a faulty computer.
The engine should run at 190 F & higher when warmed up. Scan the computer system to view engine temperature.

Keep us updated.

Oct 01, 2011 | 2006 GMC Sierra

1 Answer

Temperature guage goes to high, but it doesn't appear that the van is overheating (no steam/fluid leaking) Radiator & thermostat were recently replaced. Guage will jump to high when idle, but...


FLUSH RADIATOR, HEATER CORE AND ENGINE BLOCK.ADD 50 / 50 ANTIFREEZE AND WATER ALSO REPLACE RADIATOR PRESSURE CAP.IF TEMPERATURE GAUGE STILL STAY HIGH THE ENGINE COOLANT TEMPERATURE SENSOR COULD BE FAULTY.

Aug 21, 2011 | 1996 Ford Econoline

3 Answers

Oil pressure or temperature can cause overheating problem?


Low oil level can cause an engine to run hot but the pressure must be extremely now for that to cause a rise in operating temperature. Naturally, if the temperature is high on the guage, the engine is already overheating, and there are a multitude of reasons why an engine could overheat, from silly things like low tyre pressures to low coolant levels and water leaks. If you like, come back with some more specific information and lets see if we can put a finger on your problem.

Mar 04, 2011 | 1998 Cadillac Catera

2 Answers

1998 cadillac deville leaking coolant, temperature was around 196 and when leaking started temperature has gone as high as 225, what is causing this problem?


This most certainly sounds like a water pump issue. The thermostate is located inside the water pump housing and if the pump is bad you'l lose fluids and need to add every day or so. The temp guage will run hot and often the heater won't warm up. You have even notice fluids on the ground below the front passenger side of the car. Try getting a pressure test first before replacing anything. That's a good place to start the diagnosis.

Dec 15, 2010 | 1998 Cadillac DeVille

1 Answer

Fuel& Temperature Gauges are sticking Example gas tank full of fuel but only reads half full, temperature reads hot but engine is running at normal temperature What is wrong and how can we fix it


they could be seperate problems. the fuel level sender in the tank may be bad. the 2 wire coolant temp sensor may be faulty. there may be a bad ground some where or a bad connection in the harness. although it is common for the circuit boards in the cluster to go bad and you get funny readings on one half or the other. i would start diagnosing the cooling problem first. those engines have an air bleed valve above the t-stat. make sure there isnt a pocket of super heatad steam in the system (first indication of a small leak). the cts also controls the fan relays through the pcm. are the fans comming on as the temp guage passes half way? what does the guage do when the key is on, engine off, cts unpluged, and the connector jumpered or grounded? the guage should have a full sweep if it doesnt sweep the cluster or harness are suspect

Aug 11, 2010 | 1992 Buick Regal

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How do i change my auto tranny oil on 1991 subaru


THere is a dran plug on the left side of the tranmission oil pan. These transmission hold alot of oil and it could be very hot, so be careful. You need to change the filter too and these are quite expensive. When re-filling
I Use care not to exceed the upper limit level.
I ATF level varies with temperature. Remember
that the addition of fluid to the upper limit
mark when the transmission is cold will result
in the overfilling of fluid.
4) Fluid temperature rising speed
I By idling the engine
Time for temperature rise to 60°C (140°F) with
atmospheric temperature of 0°C (32°F): More than
25 minutes
<Reference>
Time for temperature rise to 30°C (86°F) with
atmospheric temperature of 0°C (32°F): Approx. 8
minutes
I By running the vehicle
Time for temperature rise to 60°C (140°F) with
atmospheric temperature of 0°C (32°F): More than
10 minutes
5) Method for checking fluid level upon delivery or
at periodic inspection
Check fluid level after a warm-up run of approx. 10
minutes. During the warm-up period, the automatic
transmission functions can also be checked.

From my Subaru TSB's

Mar 31, 2010 | 1991 Subaru Loyale

2 Answers

My heat in my 2004 VW Jetta stopped working and then the temperature guage started going high, do you know what that would be from


It seems as though you may have a leak somewhere. Fill your resevoir(cold) with clean water and replace the cap. Get inside the car and start the car and turn your heat to high and allow to warm up. Once the system has warmed and your engine is at running temperature, check your resevoir level and top off as necessary. If this does pose a solution, check for coolant leaks and repair.

Feb 22, 2010 | 2004 Volkswagen Jetta

1 Answer

My coolant expansion tank is overflowing after 20 minutes running


There could be a couple of reasons for this,

1. The thermostat could be stuck closed creating more pressure than normal. Your temp guage would show a higher temperature or you have another blockage in the system.
2. The expansion tank is too full.
3. The cylinder head may be leaking. If you fill the system run the engine to normal temperature with the radiator cap off, look for quite large bubbles coming out of the filler cap. If the head is badly leaking, they can be like a volcano. The temp will rise quickly from cold and the engine will overheat in a short distance.
It does seem odd that it would only spill over after 20 mins. Suspect that the expansion is over full first if your temp is normal. Let it run until it stops and see where the level is when the engine is cold.

Feb 17, 2010 | 1996 Mercury Sable

1 Answer

2000 Honda Accord - engine overheats when stopped


There are only a couple things you can check. First, I would make sure the gauge is reading properly by checking the fluid temperature manually. Newer model cars have temperature sensors that can malfunction but they will usually set your check engine light off it that is the case. Check your radiator fluid. While the engine is cold!! See if it looks dirty. Rub it between your fingers and see how viscous it feels. Make sure the radiator is full. You may just need to get your radiator flushed. A lack of flow will cause an overheating condition. When your back in motion the engine has more pressure to circulate the fluid. When the car is moving there is airflow that also aids in the cooling process as well. Other than that you have a thermostat which could be sticking and causing it to overheat. Or the water pump is bad. A flush and fill and replacing the thermostat are fairly cheap and usually a lot easier to do than replacing the water pump. Especially on a Honda. Usually you will hear a squealing noise if your water pump is going out and there is, I think it is called a weep hole on the pump itself that will start to leak when the pump is going bad.

Oct 06, 2008 | 2000 Honda Accord

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