what is your opinion?

[strikefalcon]

Short story. Son is driving my corolla, says he's at a stoplight waiting for the light to change when it quit running. No signs of impending doom . Just quits. Won't start. The compression is at 90, 90, 60, and 120 psi respectively. Won't even fire with ether shots in the intake.? We changed the timing belt to make sure there was no issues with valve timing due to belt jump etc. Just removed the head to check the gasket. It separated very easily. There does not appear to have any obvious cracks, tears, or burnt throu areas There is no oil in coolant or vice versa. what are the odds of the gasket being bad without obvious signs. also how can I check the rings with the head off.

Thanks

Replaced ECU ,plugs,wires, timing belt,

has lots of spark, fuel pressure is ok, checked EFI by the book all appears good.

I really don't understand why it didn't make a burb when giving it starting fluid while cranking.

did the Hard Starting checks listed on page EM 4 in the shop manual the last step is the compression check. which has led us to the head gasket or the rings etc.

[eage8]

you're troubleshooting this the wrong way.

you car needs 3 things to run, air (compression), fuel and spark.

fuel isn't the problem. Is it sparking? unscrew a spark plug and see if it sparks (outside the engine) while you're cranking it.

you probably have a bad ignition coil or something.

[rdyzz]

oh wow another minnesota guy lol, well im not sure theres a way to check the condition of the rings other than looking at the blocks crosshatches. if its not crome like smooth or scortched then it should be good still. was the spark plugs wet when you looked at it?

is it not turning over at all? or does it turn over but just doesnt start. cause as eage8 says all an engine needs is fuel, air, spark to work. if its getting fuel and air but no spark then it wont work. in the case of the engine air = compression. that compression in cylinder 3 looks very low.

does it have spark?

do a google search for good crosshatches and worn ones.

[TOYOPARTSMAN]

Quit running and won't start sounds like a bad igniter inside the distributor or the coil. I agree with eage8, sounds like no spark, I'd check there.