I have a 1.5L with the dual point injection. Recently every now and then on idle it will ramp in rpms and then it will die. Then it won't start and back fires. I had checked the timing and it is fine. I let it cool and it still backfires and won't start. I have replaced the coil.
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SOUND LIKE ENGINE IS FLOODING. FUEL INJECTORS IS LEAKING FUEL WITH ENGINE OFF.TRY FILLING GAS TANK UP.AND PUT A BOTTLE OF FUEL INJECTION CLEANER IN GAS TANK DRIVE AROUND A LITTLE SO THE CLEANER CAN CLEAN INJECTORS.
This all depends on when you are reading the rpms becaus ethe engine will run faster when you first start it to bring it up to operating temperature than it will drop down to about 700-800 when the engine is warm. i recommend letting your engine warm up, than read your tach and if it is still reading 1000 rpms than reduce it down to 700-800. your ECU will compensate for this when your engine is cold.
this could also be a possible bad Idle Air Control Valve because your engine speed should be regulated by the computer.
well there could be couple problems happened to mine only cuz the troddle position sensor wasn't working properly. so while idling the rpms would go up and down then sometime shut off eventually. but when you mean rev up and down you mean idling irregular? if so your timing belt and or pulley's worn fuel pump not delievering enuff fuel to fuel injection system, leaking egr valve, or even the air filter clogged.