Rep Power: 0

I got the car and replaced the transmission since it was popping out of 5th gear. i only drove it twice once after replacing the tranny to confirm it works and didn't pop out of gear. then once i drove it to the gas station so i could change the oil. after I changed the oil, it doesn't crank anymore. i did put a size 26 battery in it before i went to go to the gas station and warm up the oil. i had too much trouble with the battery that came with it cuz it didnt sound like it was really cranking until i put the new battery in it. there is a ground on the negative cable and the thermostat housing. is there any more i can check and clean? i just hear a click from somewhere near the motor mount but i can't figure out where its coming from. i hope i didnt break the starter for using a different battery. i ordered a battery from costco but waiting for them to get it so thought i would use the other one until then. the battery holds 12.8 volts fine

 
Rep Power: 367

nothing to do with engine performance modifications. Moving to mechanical issues instead

check if during the trans replacement some of the grounds were not knocked out of place. there are 3.
check if the battery terminals are properly connected.
check if the fuses are not burnt
check if starter connections are good.

 
Rep Power: 224

Holding 12.8V does not mean the battery can support a high load. Check everything mentioned above.

 
Rep Power: 222

Test the starter with jumper cables

 
Rep Power: 0

i Brought the starter to an autoparts store to check and its good. i tried both the old battery and the new one but a click only with both and i put the old starter in it this morning so i got just got the newer starter checked. I forgot to grab battery terminals but will tomorrow. When i checked the voltage to the starter it says 12.5 and thats with the key turned or not

 
Rep Power: 0

its the green key light. I only have one key for it but it works on the doors. i tried turning it on the door 5 times before trying to start but it didnt change anything. I can't figure this out

 
Rep Power: 222

That wont accomplish anything.

Green key flashing means immobilizer issues. Dealer is your best bet. A mobile locksmith that does car keys might be able to reprogram. But a dealer is the better option

 
Rep Power: 0

I'm having the same issue; however, it's only intermittent. Sometimes I turn the key twice, sometimes like twenty times. Does this still sound like the immobilizer?

The dealer told me if it's the immobilizer, good luck. He repaired one, it cost around $1,200, and it took almost two months to get all of the parts custom made. He said it could ALSO be the key. Which costs $300 w/labor to reprogram. Is this true? What are the chance of it being the key vs. the other components?

 
Rep Power: 0

It ended up being rubber stopper in clutch pedal for interlock switch was missing and needed to be replaced.