2004 C5 P0300 code

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May 18, 2016 | 04:28 PM

My blueberry

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7th Gear

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2004 C5 P0300 code

I have a 2004 C5 with a Borla exhaust and K & N filter. I have had this P0300 code on and off for a while now. Car has 74,000 Kms ( CDN car ) We changed the serpentine belt and pulley. Changed the spark plugs and wires. The car has a new left side gas tank done under recall. The car looses a slight bit of power on acceleration and also while cruising on the Hwy. The light does not stay on nor does it flash. It will go back off in time. The car also has a chirping sound, hence we changed the serpentine belt and the pulley still this sound, it is only at start up and goes away after the car warms up. Any help would be appreciated
Thank you

May 19, 2016 | 06:03 AM

dadaroo

Le Mans Master

Joined: Mar 2011

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From: Columbia SC

Check the plug wires to make sure they are properly connected. Would also suggest you use a scanner to find out which cylinders(s) are an issue.

Mr. Sam

May 19, 2016 | 07:29 AM

runner140*

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Joined: Mar 2004

Posts: 8,700

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From: Ft. Lauderdale Fl

Shade tree mechanic trick...at night or in a dark garage, start car and look for a possible spark..around the plugs, wires or coil packs.

May 19, 2016 | 12:52 PM

My blueberry

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7th Gear

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Quote:

Originally Posted by dadaroo

Check the plug wires to make sure they are properly connected. Would also suggest you use a scanner to find out which cylinders(s) are an issue.

Mr. Sam

Thanks Mr Sam for the information
Greatly appreciated

May 19, 2016 | 12:56 PM

My blueberry

Thread Starter

7th Gear

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Quote:

Originally Posted by runner140*

Shade tree mechanic trick...at night or in a dark garage, start car and look for a possible spark..around the plugs, wires or coil packs.

Thanks runner 140. I will definitely do that for sure. The concern at the moment is the chirping sound from under the hood combined with the P0300 code so we will be looking at your suggestion tonight 😊

May 19, 2016 | 01:13 PM

helga203

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Joined: Jul 2010

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Quote:

Originally Posted by My blueberry

Check your crank damper for any wobble at all. These cars are notorious for dampers going bad.

May 19, 2016 | 02:32 PM

My blueberry

Thread Starter

7th Gear

Joined: May 2016

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Quote:

Originally Posted by helga203

Check your crank damper for any wobble at all. These cars are notorious for dampers going bad.

Thank you very much helga203, we will definitely look at the crank damper for sure to see if there is a wobble at all, appreciate your help 😊

May 19, 2016 | 02:37 PM

StingrayRebel

Acct Suspended APR 2026 by request

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2020 Corvette of the Year Finalist (performance mods)

C5 of Year Winner (performance mods) 2019

another thing to check relating to the misfire code is the wiring harness where it runs behind the intake manifold on the drivers side... there is a metal bracket that the harness is known for rubbing against and over time it can chafe the wires and cause injector/coil issues... every time I remove an intake manifold I leave that bracket off

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May 19, 2016 | 06:56 PM

My blueberry

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7th Gear

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Quote:

Originally Posted by neutron82

Thanks neutron82. I have read about that and will definitely be checking that out. Never thought much about it but now I'm starting to wonder if it might be that. The car runs and rides great other than this chirping sound and this darn CEL 😏