Q: Car wont start after replacing timing belt but I know timing is spot on. What could it be?

Hi there, thanks for writing in.

Well if the car ran before you did the timing belt, but now doesn’t run after, I am or course going to say that the likely scenario is that the timing is off. Make double and triple sure that you’re using the correct marks on the camshafts and crankshaft, and make sure that the belt is properly tensioned. If all this is correct, it’s not impossible that something else failed, just highly unlikely. The next step after verifying the timing is correct would be to check fuel pressure and run a compression check. You would normally want to check for spark, but you have already done that. If the timing belt was off before and you turned it over at all, it could have damaged valves and that would cause the motor to have no compression. If these checks don’t yield any results, then you should consider contacting a professional technician, such as one available from YourMechanic, to diagnose the no start condition.