Guess one: 2.0L engine. found on usa cars, but more engines outside, USA, so answering for USA spec. car.
my guess (unsaid by u) is you connected the scan tool
and it put out only one DTC , right? and you cleared it and it keeps coming back. ? P0303, is that code, RIGHT>>?
why not tell what you scanned, all DTC first.?
not just 1 DTC more than one DTC (error) is stored.
303 means COMBUSTION was weak on #3 when it fired.
the PCM has no idea at all why, ever. (puters are dumbb)
1: weak compression, or valves sticking...
2: bad spark, for many reasons, gapped wrong, wrong pluts bad plugs. bad cop (i guess the cop was swapped) oil in spark wells.
3: a bad injector (that which fires it the PCM)
rotate injectors yet?
4: coolant found on spark tip 3, green coolant. or oil soaked?
we collect all evidence. and do all tests. not just spark.
injector coil ohms match the other 3?
does the noid light test flash on all 4 injectors?
did you remove the spark plug cop coil.
add a spare new spark plug there.
and ground the spark shell. (standard ops for 100 years) way.
and then crank and see if #3 actually does fire?
that be 1st. after all the PCM also fires, COPS. just like injectors.
that be all.
do a real spark test yet, using new test spark plug?
do a injector noid test, see if ECU is firing it? and coil ohms test, then click test(ear to it or sonic probe tester)
do an injector balance test yet.
if that injector fails. then the injector is stuck closed, clogged dead or the noid test really does fail.
do that?
and you will find it.
you already found compression at 199 psi
which is hot spec.
this engine has 10.5:1 CR. and runs super hot
compression spec.
comments are on J20a, the J20b has VVT and is a whole other BALL OFF WAX.(story)
on all these engines, with good spark plugs
gapped to spec, i remove, #3 COP,
is the boot on the end all carbon wrecked???,
(so common, like falling off a log))
there is no distributor in any J20.
this DOHC has cam shim tappets
did you check lash first.?
if a VALVE recedes, the lash gets too tight.
and doom thing, if it goes to 0 lash.
need the FSM pages on that, have it,
ask.
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Check for a crack or carbon track in the distributor cap for no 3 plug lead
It could be a wiring or harness connection for no 3 injector or a problem ECM control for no 3 injector ( check for moisture in the connections and or bad pin conditions
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