Hi double check the code which came up, as P0303 is no.3 cylinder misfire.
Anyway this could be as simple as the spark plug . But is usually the coil.
I hope i have been of some help to you
John (South Wales uk )
Anyone knows?what means CODE 003:
00772 P0303 Cylinder 4: misfire detected on volkswagen 2002
SOURCE: 2000 CIVIC System too lean Cylinder 3 and 4 misfire Deteced
SOURCE: 2000 ford winstar sel update to problem
i had asimiliar misfire on my 2000 windstar.the first thing to check is a broken valve spring by taking off the valve cover the other is a o2 sensor bank 2 i believe is the downstream.if not the valve spring then either the coil pack or thecontrol module. either way it is fairly inexspensive
SOURCE: 2002 Saturn SL1 check engine light code P0303
For old models, Saturn/GM also used the same material
fiberglass gasket in your model, you almost certainly have a leak from
a crumpled, sucked-in gasket as I suffered (and many others). I would
say going to Saturn dealership to make repairs is probably not good
idea if they are going to put in the same GM intake gasket part. Maybe
possible to specify Felpro gasket with whatever shop you go to if you
don't do the repair yourself. I would not go too long with your car in
that condition as there is localized leaning at your cyl-3, that could
cause a burnt exhaust valve there.
The exhaust is extra hot venting out
that cylinder. P0303 is misfire at cyl-3. Mine was P0301 (cyl-1). You
may get P0507 once in a while when PCM fails to control the fast idle
caused by the leak under certain conditions. Most of the time, it is
very slow idle caused by 3 cylinders running. You run smoother in cold
idle because the IAC opens up to increase idle and end up lowering the
manifold vacuum, so the reduced vacuum causes less leaking at the
failing intake manifold gasket.
I'd say try cleaning everything with your ignition before replacement; Idle problems could be caused by engine coolant sensor (ECTS). Are you sure it was changed? Did they put on a new wire connector along with it?
Hope helps.
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i got the same code p0303 misfire 2001 dodge intrepid i fixed that and it still misfires
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