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3

The most likely cause is the thermostat. The on the road temp is the clue, it should be at the thermostat open temperature which is specified to be 180 deg F. This is the lowest temperature that should be seen on a road test if the thermostat is working normally. It is possible that the sensor is reading 20 deg F low but it is not at all a common problem. ...


2

Pull all your spark plugs, careful not to mix them up in reference to which cylinder they were IN. Are ALL of them as BAD as That one you show us here? IF that plug is the darkest, IS IT FROM THE CYLINDER that your FUEL PRESSURE REGULATOR gets its vacuum suction from on the INTAKE RUNNER feeding that dark over fueled spark plug. HINT undo the vacuum hose ...


2

Fuel Rail Pressure was around 6 bar when off (25 bar when on, 70+ bar at WOT), it remained this even after 2 hours (I'm guessing it primes when you turn on the ignition) I believe this is the root of your problem. The fuel rail needs to maintain a certain pressure so that the vehicle can start up with the engine hot. If the pressure isn't high enough, the ...


1

I believe your thinking on how a thermostat works is misguided. It can be fully open or fully closed, or anywhere in between. When the engine is cold, most thermostats are completely closed and stay that way until the engine coolant gets to operating temperature, then open the needed amount to allow coolant to flow until it gets back down to the operating ...


1

Here's an image of where your ECT is located on the GM 4.2L 6-cyl engine:


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NGK is backwards with heat range, meaning the lower the numeric digit is, the hotter the NGK plug is. This is unlike every other spark plug where you get colder in heat range when the number is lower. So if you seek a band aid till you figure the problem out.. place a hotter plug in just the holes that show carbon deposits on the plugs, so it won't foul ...


1

Once you get the cover off, the sensor is located towards the back of the engine on the right side (as if you're sitting in the vehicle - passenger side for people in the States). I've clipped a couple of images from this video (very crappy quality, but it gets the point across). It is for a 2011 Malibu, but seeing as how it's the same 2.4L Ecotec engine, ...


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The answer to your question is more simple than you may have thought. There are actually two separate sensors for this model. One is a sending unit that sends info to the gauge, not the ECU, which means that it's also possible for your gauge to give an incorrect reading or fool you into thinking the car is overheating when that's not the case at all and ...


1

Yes, you'd be fine doing a continuity test – with both ends of the cable disconnected there wouldn't be any thing that would be likely to interfere. The suggestion to do a bit of poking around the ECT connector to see if you can see the colors of the wires will help you narrow things down on the other end if you can also see the wires at the ECM end. There ...


1

Haynes usually has decent electrical diagrams in their manuals. If you get really desperate cut a bit of insulation back from the back of the ECT connector and check the wiring color, then do the same at the ECU end. Repair it with good quality friction tape.


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