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Discussion Starter #1
2012 Terrain 2.4 L with 103k miles. Engine stalls on cold start but then starts right up. Stalled a few times driving to work. Seems like transmission doesn’t want to shift out at times. No codes thrown. Have already serviced transmission, cleaned throttle body, changed cam shaft solenoid, doesn’t burn oil. Any ideas?
 

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Besides a clean air filter (rarely the problem) and good plugs, I guess I’d be looking at fuel delivery/pressure. These things have two pumps. Do you have an OBD-2 reader with data logging capability? Maybe that could show fuel pressure sporadically dropping out (or too low)?
 
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A family member had a 2013 Equinox 2LT FWD with the 2.4L engine. The high pressure fuel pump failed at 31,xxx miles. It caused rough idle and stalling, and dumped raw fuel into the engine crankcase. The fuel caused the oil level to rise about one-inch higher above the full mark on the engine oil dipstick. Keep an eye on the oil level - to see if it is increasing. The raw fuel will quickly damage the engine.
 

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I have also see crankshaft position sensors do similar things without throwing codes.
 

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With scan tool see what engine temp. is seen by PCM when cold. Both engine and inlet temps. . Warmer reading than actual will cause lean stalls until engine warms up and sensors may not be off far enough to set codes.
 
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Discussion Starter #7
Followed all advice and still stalling. This started when GMC had a recall on the high pressure pump and took it in to be replaced. Oil level is normal but has been extremely black since replaced. When starting the engine and the rpm idle up, then drop back down, unless you tap the gas pedal, the rpm’s fall all the way until it dies. Then starts right back up, no problem.
 

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Followed all advice and still stalling. This started when GMC had a recall on the high pressure pump and took it in to be replaced. Oil level is normal but has been extremely black since replaced. When starting the engine and the rpm idle up, then drop back down, unless you tap the gas pedal, the rpm’s fall all the way until it dies. Then starts right back up, no problem.
Did you ever find the solution to this? I am having the same issue and have replaced a lot of crap trying to fix it. MAF, MAP, both Actuator solenoids, TPS, Throttle Body, and more
 
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