LC9 5.3 l gmc engine - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 10-15-2013, 02:24 PM   #1
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Angry LC9 5.3 l gmc engine

I have a 2007 Yukon Xl 4x4 that blew the engine. I ordered a replacement LC9 engine that was removed from a 2008 Chevy Avalanche. The mechanic used parts from my old engine ie manifold,oil pan etc and installed engine however it will not start. Did I get the wrong engine or will this work? Any suggestions would be very helpful as I know very little about what to do at this point. Thanks to anyone that can help.
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Old 10-15-2013, 02:50 PM   #2
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I think you have the wrong reluctor ring on the crank. 07 was the las year of the 24 tooth ring and in 08 they went to a 54 tooth ring and changed it to a grey crank sensor from a black sensor. To make it work I think your going to need to program the PCM to 08 specs and make sure it has the grey crank sensor.
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Old 10-15-2013, 03:56 PM   #3
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Thanks Racer. I forwarded on to my mechanic and think he can fix. He knew the sensor was incorrect but now we know how to fix
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Old 10-15-2013, 05:03 PM   #4
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He is also going to need to wire a new plug to the harness because they are different between the black and grey sensors.
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Old 10-15-2013, 05:53 PM   #5
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Where were you 2 months ago when I was doing my V8 swap?
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Old 10-15-2013, 09:16 PM   #6
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Quote:
Originally Posted by Mike1995 View Post
Where were you 2 months ago when I was doing my V8 swap?
I was watching you finish installing your vortech motor! I think you made the right choice going with the vortech over the LS motor. If you went with the LS motor you would have to deal with a whole different harness, coolant lines, AC lines and different mounts.
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