question what all reasons causes the timing belt to pop? and how to diagnose??

 

what do you mean by "pop"? does it still run?

 

no the belt popped u know as if u were to pull one end and i pull the other and the belt snap!... well yea thats what i'm talkin about the car wont start until i replace the belt but i wanted to know what causes that to happen b4 i go and put on the new belt

 

old age. after a lifetime of being stressed from the starter turning the crank on the flywheel/ring-gear and turning the camshafts...well its a load. the belt just gets fatigued. you probably have a few bent valves also now because the motor is an interfearance motor. the pistons probably hit some of the valves. pull the head also and have a machine shop do a complete valve job and also have them replace all of the valve guides. buy new head bolts also. and i recommend replacing the head gasket and timing belt with dealer parts. also replace the balancer shaft belt with a dealer part. replace the timing belt and balancer shaft belt tensioners and water pump with autozone ones.

 

If the timing belt breaks while the engine is running in any '90 or newer Accord, you're pretty much guaranteed to bend valves. I haven't seen an F-series engine with a broken belt yet that didn't bend valves. There's no point in just replacing the belt now because it's going to run terribly. You're going to have to pull the head and do a valve job.

Timing belts on '90+ Accords should be changed every 105,000 miles or 8 years, whichever comes first.