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Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900
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  #1  
Old 02-21-2012, 06:15 PM
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Post Code P0307- Mysfire Cylinder 7 is driving me crazy!!

Hey guys, i recently bought a 06 chevy silverado crew cab 5.3L 4x4 and it came with the check engine light on, but i thought it would be easy to take care of it by replacing the spark plugs, spark plug wires, cleaning out the throttle, but i already did those changes and the scanner still reads the same code. does anybody know what the problem might be?
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  #2  
Old 02-21-2012, 08:20 PM
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swap a coil from another cylinder. clear the code and see if the misfire follows the coil.

there is a tsb for poor connection to the power feed to ignition coil feed circuit so if it doesn't follow the coil for the above test...check for spark at the spark plug wire for #7. If no spark check for power to the coil with key on.

Last edited by tech2; 02-21-2012 at 08:27 PM.
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  #3  
Old 02-22-2012, 06:54 PM
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Hey man, i tried swaping the coil from one cylinder then i cleared the code, but the misfire remained at cyl # 7. the spark plugs and the wires are brand new. what else could be the problem? do you think i should check the injector?
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Old 02-23-2012, 05:28 AM
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Quote:
Originally Posted by Tavo Govea View Post
Hey man, i tried swaping the coil from one cylinder then i cleared the code, but the misfire remained at cyl # 7. the spark plugs and the wires are brand new. what else could be the problem? do you think i should check the injector?
check for spark at the plug wire for #7 with a spark tester
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  #5  
Old 02-24-2012, 12:56 AM
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Good advice from tech 2.But i had the same issue.Replaced everything,Map,all 4 o2,plugs,wires,idle control,and so on. Have you checked ur fuel pump. Should be at min. 55lbs. One pound under and it will cause A misfire code. Could of saved my self A LOT of money if Id checked it first. Ended up that was my problem. You will need a fuel pressure Gage. Got one from parts house. Good luck
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Old 02-26-2012, 07:29 AM
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Get a small peanut bulb and pull 2 wires away from bulb then plug the bulb into injector connector and start engine should see dim flash every time injector fires that will verify power and ecm groundind circuit.
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  #7  
Old 02-26-2012, 07:34 AM
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Also unplug vacuum line off fuel presure rail while running and see if it spits a little fuel out.that was a common problem.regulator is alittle bigger than a quter and is on dr.side about 12" from back of fuel rail
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Old 02-26-2012, 07:34 AM
 
 
 
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0307, 53, chevrolet, chevy, code, cylinder, drive, engine, misfire, p0307, plug, po307, silverado, spark, truck


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