Timming ok checked cams they in line spark plugs right spark there still backfire why
Do you have normal compression in all cylinders ? An exhaust valve could be burned or sticking open.
SOURCE: jumped timing?
It really does sound like the timing went out of whack. The timing belt should be replaced periodically, according to your owner's manual. It may have worn and stretched just enough to slip over a cog a bit. Remove the timing belt covers and check the alignment of your cam and crank. There should be subtle marks on the cogs and the rear cover or casting. The compression will be good during a cranking test, but will not be ok during a running compression check. Replace the timing belt and check the pulleys. If your timing belt did not slip, the timing chain tensioner or guide shoes may be worn and will require replacement.
SOURCE: backfire through intake
Check compression possible tight valve lash, if ok Check for vacume leak, make sure firing order is correct, check power to injectors an make sure injectors are working.
SOURCE: FORD cortina 3.0L V6 starting problems.recon tops
Have a look at the coil and its supply lead, standard it has a 9v coil and a resistor wire in the harness, this gives trouble ar resistor wire is odd and will not solder or weld and its expansion when hot loosens crimps! If you put 12 volts into a 9v coil it overwhelms (magneticly) the windings and gives a poor spark, also burns the points.
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