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Misfire P306

Old 04-17-2019, 01:01 PM
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Default Misfire P306

Was running fine and stopped at a gas station the car began misfiring . Found code P306 so did a complete tune up wires plugs coils and ignition control module then reset the code and same code returned. Since then I changed fuel injector 6 only to have same issue sputter and P306 return . Anybody know what else it could be ?
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Old 04-17-2019, 01:49 PM
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I assume it'* an Oldsmobile? Based on P0306 I also assume it'* a 1996 or newer? What year? Engine? Do you have a compression gauge?
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Old 04-17-2019, 07:31 PM
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Originally Posted by carfixer007 View Post
I assume it'* an Oldsmobile? Based on P0306 I also assume it'* a 1996 or newer? What year? Engine? Do you have a compression gauge?
If you click on his profile, you would see he has this info filled out.
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Old 04-17-2019, 08:27 PM
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Originally Posted by Mike View Post
If you click on his profile, you would see he has this info filled out.
Thanks,
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Old 04-17-2019, 08:44 PM
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Agree with Carfixer, get a compression gage on all cylinders....if within spec, and you have good spark(check with a spark tester), if injector is ok, was the harness to injector 6 ok(can be checked at the external injector harness connector)? Have seen mice eat the insulation under the plenum.....

If that all checks out, I ran into this one time and I chased my tail on it.......turned out to be a vacuum leak......the lower intake gasket had a crack in it, where the port for #6 cylinder was.....a lower intake job was done a few months before.....looked like poor installation was the culprit.....
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Old 04-17-2019, 10:16 PM
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I would do a running compression test as well. That will pick up things missed in just a static compression test.
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