Returning code p306
Returning code p306
This is the third time I have had to replace the plugs and wires in 8 months time. A/c delco are not cheap parts by any meens. I noticed that at the intake manifold that it is leaking ever so slitly could this be my problem. And if so why only one cylinder. On to anouther idea i have not ever replaced the disturbter. Any help would be appeccated
Last edited by DaddysBlazer; Jul 8, 2012 at 06:05 AM.
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Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
P0306 is indicating a misfire on cylinder #6. Whatever the problem is, it is affecting that cylinder only, which limits the possibilities considerably. If the intake gasket is leaking vacuum, internal or external, or coolant internally, near the #6 intake port, it can cause a misfire. Could be a problem with #6 injector or its circuits, spark plug, plug wire. Check the plug for wetness, (unburned fuel) or dry, (lack of fuel). If there is a knocking or ticking sound, it could be a problem with a lifter.
Last edited by Captain Hook; Jul 8, 2012 at 07:49 AM.
I replaced the intake manifold gaskets this morning and still getting the code but I now curious where these circuits are at, before I buy another set of plugs and wires. Just replaced the spider 2 or 3 months ago so I hope thats not the case. Ill pull a plug and let you know. thanks
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Joined: Mar 2009
Posts: 8,453
From: Belleville, Michigan
If you perform the injector balance test, along with fuel pressure and leakdown tests, the results of those tests will either confirm or deny a problem exists in the fuel delivery system for cylinder #6. This will require a fuel pressure tester and a scan tool capable of initiating the injector balance test.
Here is the flow chart for misfire: https://blazerforum.com/forum/diagno...4-5-6-a-35153/
The alternative to doing these tests is to start throwing parts at it.
Here is the flow chart for misfire: https://blazerforum.com/forum/diagno...4-5-6-a-35153/
The alternative to doing these tests is to start throwing parts at it.
i had a friend with a s-10, 4cyl getting a p0304, long story short, found a
failing electrical connector at the injector, which then set off a chain reaction and the ecm kept compisating for the misfire,which ended up
needing a rebuilt ecm, there is moor to it,but that is the short of it, replaced the wiring and ecm, runs great, his truck is a 2003 with 210000
miles
failing electrical connector at the injector, which then set off a chain reaction and the ecm kept compisating for the misfire,which ended up
needing a rebuilt ecm, there is moor to it,but that is the short of it, replaced the wiring and ecm, runs great, his truck is a 2003 with 210000
miles
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