Question about Cars & Trucks
P0303 OBD-II code after replacing ignition coils, plugs, and reprogramed ecm
Did you change the wires? Most people don't know that plug wires need to be changed just as often as plugs. They get worn out quick. Also check voltage pulse coming from crank sensor to see if it sending signal to module and coil packs.
Also check that you do not have any stuck or leaky injectors.
Posted on Sep 09, 2009
I have the same problem. changed the plugs, wires, coil pack, crank sensor and the oil sending unit, I'll post later to let you know what happens after I change the fuel filter and injectors. This is personal now. Not stopping untill I figure this out..
The engine light is on showing a misfire in cylinder 3. the car shakes at stop lights an then the engine light flashes, but once you give it gas the engine smooths out. (the engine light stays on)
Posted on Mar 21, 2010
Can you follow-up on the work you have completed so far...did the problem get resolved? I have the same misfire #3: replaced wires, plugs, uim and lim gaskets and upper intake, and #3 coil pack. Still have the same idle shake and loss of power. If I unplug the wire from the #3 plug the idle smooths out. I'm at a loss, please help..Chris
Posted on Jul 01, 2010
After you check everthing and its okay ,try a compression test. and leak test on cylinder.
Posted on Jul 22, 2010
Check the cilinder compression
Posted on May 17, 2010
Gentlemen, I know your pain! The stupid 3rd cylinder is under the Intake and you have to remove it, fix whatever the issue may be, then put it back on just to figure out that the issue did not go away! My head a bad connector plug on the fuel injector and that was the reason for the missfire on my 02 S-type....I still have the damn Ignition Coil A code P0351 coming on and there vehicle is running fine, with no problems, just the damn code keeps popping back up!
Posted on May 06, 2010
2000 pontiac montana 3400 #1 cylinder misfire checked 7x sensor/replaced pigtail checked continuity good igniton module checked out fine one coil was weak replaced plug and wire replaced still same code 24x cps not checked yet according to buck only brain left anyone
Posted on Sep 08, 2010
Clint what happend when you replace those parts. I have right now misfire on cyl.1 and replaced the MAS sensor, checked the injectors, moved coils and plug one step to the right and the error stays with cyl. 1.
My symptoms are the similar as your. If i clear the code it will stay away until it fails again.
Posted on May 06, 2010
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Posted on Jan 02, 2017
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