I have a Toyota Corolla 2001. It starts well when cold (on mornings) but if I take it up after a 15-30 minute period I have to start the engine at least twice before it actually catches. However if it is just laid down for say at least an hour and a half it start really well. Its becoming really frustrating. Please help!!

Consider replacing the main relay. Cold circuit board solder joints separate in hot weather and frequently cause the type of problem you described. Also, I would test/replace the Ignition Control Module (igniter) and coil. Many AutoZone stores will do this for free. Heat and electron migration take a toll on these key ignition components. Finally, I would replace any platinum spark plugs that have over 50,000 miles on them. Kitch428 is an expert on Toyotas and, if he sees this posting, could offer you his insight on your problem.

Ok, just so we're on the same page, the engine is turning over with key in start, correct?
If it is, we call this extended cranking time in the biz.
Ill research some service bulletins to see what I can come up with. Not a common problem on 01 corolla's. Pretty reliable.

Yes the engine is turning over but just won't catch. Have taken it to several mechanics but none seem to know what's wrong. I had a couple tune ups, had the trottle clean and I just seem to be paying out money all the time and still isn't getting the problem fixed.

I've checked TSB's, and none for this issue on your vehicle. If it were me, I'd like to have the car for the day, and have a fuel pressure gauge hooked up at each start attempt.
This is called a hot soak condition that you describe. Fuel pump may be bleeding down with a bad check valve. Just a thought.

Yes, fuel pressure could be the problem. Any check engine/ses light on? Possible codes set. Coolant temp sensor going out of range can cause some bizarre problems, too. Also, the ECM could be the culprit. Many are covered, by law, way past the bumper-to-bumper has run out.

No I haven't seen any check engine lights come on. And what is the ECM? - I'm not really into cars that much as I recently bought the car. Anyway thanks you guys I've got to go to mechanic tomorrow so I will ask him about some of the stuff you guys recommended. Will keep you all informed.

ECM=engine control module=computer... yeah, tell him replace the coolant temp sensor if fuel pump checks out. It's a cheaper part, and a good bet, but might not do the fix.
Just bought it? Word to the wise, keep an eye on oil level. Some of these used more oil than they should have. Just the way the piston rings wear into the cylinder bores.

Good luck.

Hi guys, been to mechanic whole weekend anyway he put me on to an electrician who's saying I need a gas line with valve from injector rail. Called Nassco but they don't have it so I've got to place an order which I will have to wait for 3 weeks. He also said he's go in to check the circuit to see if it has any dry joints some time tomorrow. Anyway you guys have been most helpful.