Hi guys and gals, new to Club Lexus.

I have a 2001 Lexus IS300. The immobilizer on my key broke and my car wouldn't start. Before I had no such issue with this, so when I had my ECU modified (immobilizer removed) I thought I wouldn't have any problem starting the car. Now, it just doesn't want to start up, and when I sprayed starter fluid into the intake the car backfired through the intake.

Any idea as to what the issue is now?

I am at the end of my patience with this car, and don't want to drop too much more money into it as it's already pretty rough anyway...

 

Need to check timing, fuel, and spark.