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2011 Malibu will not start after changing engines

6.1K views 8 replies 3 participants last post by  DrivenDaily  
#1 ·
My daughter smoked her 2011 malibu 2.4 ecotec engine by not changing the oil often enough. I bought a 40,000 mi. engine of the correct codes from a salvage yard and installed it in her car. When I try to start it all that happens is the starter drive will engage the flywheel but the starter motor will not rotate. The battery shows 14 volts. The engine is free and rotates. All grounds have been properly cleaned and reattached. I thought the starter was bad so I bought a replacement. Same results. I have checked the fuses in all 3 locations and they are good. Tomorrow I will check the starter wiring system and the TR switch. ( neutral safety switch ) Any suggestions of possible solutions are welcome. Thanks in advance.
 
#2 ·
Test the starter at the starter by bridging the battery terminal to the starter motor terminal. If it doesn't turn, then the starter is bad or the cable has no power.

If it turns, then try the key. If that doesn't turn it, then check the relay and the fuse for the starting circuit in the underhood fuse box. If necessary, you can swap a relay from a non-critical circuit (AC, etc) to determine if the relay is bad.

If it seems to check out, then apply 12V to the terminal that sends 12V to the starter solenoid.

Test the other 3 pins on the relay's socket for 12V and a switched ground. There should be 2 pins with 12V and one that switches on a ground when the key is turned.
 
#3 · (Edited by Moderator)
Test the starter at the starter by bridging the battery terminal to the starter motor terminal. If it doesn't turn, then the starter is bad or the cable has no power.

If it turns, then try the key. If that doesn't turn it, then check the relay and the fuse for the starting circuit in the underhood fuse box. If necessary, you can swap a relay from a non-critical circuit (AC, etc) to determine if the relay is bad.

If it seems to check out, then apply 12V to the terminal that sends 12V to the starter solenoid.
Test the starter at the starter by bridging the battery terminal to the starter motor terminal. If it doesn't turn, then the starter is bad or the cable has no power.

If it turns, then try the key. If that doesn't turn it, then check the relay and the fuse for the starting circuit in the underhood fuse box. If necessary, you can swap a relay from a non-critical circuit (AC, etc) to determine if the relay is bad.

If it seems to check out, then apply 12V to the terminal that sends 12V to the starter solenoid.

Test the other 3 pins on the relay's socket for 12V and a switched ground. There should be 2 pins with 12V and one that switches on a ground when the key is turned.
Test the other 3 pins on the relay's socket for 12V and a switched ground. There should be 2 pins with 12V and one that switches on a ground when the key is turned.
Thank you for your help, let me tell you what I found. I was a machine builder all my life but electrics...not so much. I have no 12v power at the starter. The starter fuse 30a and the run relay fuse 30a are good. The ignition fuse 10a is good. Relay check. Relay 32 is the run crank relay. with the key off 1 pin has 12v and 1 pin has 3v. With the key on 2 pins have 12v but no third pin power. Relay 31 is the start relay. With the key off only 1 pin shows 12v. With the key on 1pin has 12v and 1 pin has 3v. No third pin power. Am I checking this correctly and if so does this indicate a bad ignition switch???
 
#5 ·
I'm glad you got it sorted out!
 
#7 ·
See if this might help any.