Tavo Govea

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?

tech2

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.

Tavo Govea

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?

tech2

check for spark at the plug wire for #7 with a spark tester

billkidib99

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

GNSPEED

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.

GNSPEED

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