Need Help with P0304 Misfire - Chevy Colorado & GMC Canyon

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Old 01-09-2010, 11:31 AM   #1 (permalink)
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Default Need Help with P0304 Misfire

Hello,

I have an 05 Colorado with 105,000 miles.

Need help with code P0304 # 4 cyl misfire.

So far have changed spark plugs put on new fuel and air filter.

Rented OBDII scanner from autozone.

Deleted all codes and as was pulling in to have inspected after driving for 70 plus miles code came back on P0304.

I swapped the #4 ignition coil with the #5 Coil to see if I would get a P0305, But again after about 55 miles got another P0304.

Truck runs fine, Seems to have nothing wrong just this code that prevents it form passing NC inspection.

Any help or Suggestions greatly appreciated.

Thanks.
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Old 01-09-2010, 11:38 AM   #2 (permalink)
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Default Re: Need Help with P0304 Misfire

Welcome to Cfans!
well youve eliminated the possibility of it being a plug or coil so you need to check the compression of that hole. how does it idle?
if that is good then it could possibly be in the wiring for the injector or the injector itself. Check that the injector harness connector is fully seated
short of that you may have the famous cyl head issue.
hope this helps :)
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Old 01-12-2010, 06:22 PM   #3 (permalink)
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Default Re: Need Help with P0304 Misfire

Thanks I Checked the wiring and all seemed ok.

It does have a rough idle so just pulled the pcv tube and had a friend rev engine while i plugged and unplugged the tube.

Hooked back up and it idled around 750 for a good 3 minutes then dropped down to 400 nearly stalling then would idle going between 400 and 900 rpms.

Planning to take it to a mechanic This Friday.

I will let you know what they find..

Thanks.
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Old 01-12-2010, 07:18 PM   #4 (permalink)
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Default Re: Need Help with P0304 Misfire

had mine done under warranty. sad to hear you have that many miles it will not be covered by warranty. 2-3 thousand for shop to fix.
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Old 01-12-2010, 08:18 PM   #5 (permalink)
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Default Re: Need Help with P0304 Misfire

Quote:
Originally Posted by CSTEVENS05
Hooked back up and it idled around 750 for a good 3 minutes then dropped down to 400 nearly stalling then would idle going between 400 and 900 rpms.

this tells me you have a vacuume leak......possibly
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Old 01-13-2010, 09:41 PM   #6 (permalink)
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Default Re: Need Help with P0304 Misfire

Quote:
Originally Posted by zeuce
Quote:
Originally Posted by CSTEVENS05
Hooked back up and it idled around 750 for a good 3 minutes then dropped down to 400 nearly stalling then would idle going between 400 and 900 rpms.

this tells me you have a vacuume leak......possibly
Thinking the same. Inspect all your hoses for cracking/dryrotting. And have a garage do a leakdown test to see if you have the head issue.
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Old 01-14-2010, 05:43 AM   #7 (permalink)
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Default Re: Need Help with P0304 Misfire

You might have compression leak at your intake valves just like alot of other people have had. Read the sticky at the top of the sub forum titled Latest P0300 Fix.
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