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Intermittent no start

11K views 13 replies 7 participants last post by  GCTruckster 
#1 ·
I've got a 2010 T/C 3.3 liter. I've got an intermittent no start issue. About 2 or 3 times a month it will spin over and not start ( I assume ECM controlled). It cranks endlessly until you turn off the key switch. Wait about 5-10 seconds to clear the brain fart. Try to restart and it then starts w/o a hitch and runs perfectly after that. I just don't want to get stranded w/ a no start issue if it finally decides to quit. Anyone else run into this problem?
 
#6 · (Edited)
You guys are correct if the engine is actually cranking. Probably I misunderstood, I thought the starter was freely spinning but not the engine.

Marked1, on modern vehicles, if engine is cranking but fails to start, starter will keep cranking for a few seconds even if you release the ignition key, as a matter of fact, when turning engine on, you just turn the ignition key to the starter position until the starter engages, then release it and it will keep cranking until engine starts.

So, you only have one problem, your vehicle fails to start, the other issue (starter keeps cranking) is a normal feature of your vehicle.
 
#12 ·
Spark or Fuel, Hmmm. Not sure since It only happens about every 2 or 3 weeks. when I shut it off and try to restart it always restarts and runs perfectly for about another 2-3 weeks. I haven't popped the hood, run out and pulled a plug wire to see while the engine is still cranking over. I might give that a try in the future. Hope I don't get a jolt.
 
#13 ·
When engine fails to fire, there are two main reasons:

No spark (or wrong timing).
No fuel.

Problem is, there is a long list of possibilities, diagnostic is not always easy.

Also, lack of oxygen (or too much fuel) is another posibility.

Low compression is also another posibility, but it may not be the case because it wil start on the second try.
 
#14 ·
Since it's so intermittent I think it either could be a bad sensor, responsible for delivering fuel and spark on time, like crank shaft position sensor or cam shaft position sensors, or perhaps the wires going to any of these sensors could be making a short of some sorts.
I had a crank position sensor fail on me permanently and it completely cut of fuel and spark. The engine would crank and would not fire up when starter fluid was sprayed. Lack of fuel smell, from all the cranking, is what prompted me to try the starter fluid. Once the sensor was replace, the car fired up no problem.

Also, I would get it scanned, perhaps there is a pending code stored in the memory, but not enough to trigger the CEL.
 
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