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spark plug wire

braggent

By braggent
in Ask A GM Technician

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braggent Enthusiast

braggent

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i changed my wires on my truck 1996 chevy 1500 305 engine. i did not think that the way you wire in the plugs made a difference but i started to get a check engine light. well i pulled the code and it was P0303 which is a misfire on cylinder #3. well i pull the plug out and it was fouled the plugs are brand new and so is the cap and rotor. all acdelco oem. i cleaned the plug off and cleared the code and the CEL came back on. so next i swap the plug with the #1 cylinder and cleared the code again and back the CEL came on again. the truck is runing rough at idle or on a the road also. at idle about 900 rpms the engine runs bad before 900 and after it is fine. well next i swaped my wires #1 and #3 and the truck ran fine and i drove it around and no CEL. the only thing i notice is that the truck felt funny on take off but after that it was fine. i am think may because it has sat so long the more i drove it the better it ran. well next i change back the wires and sure enough the code came back on. i check the wires with a multimeter and #1 was 27.1 and #3 was 27.7. i dont know why this is but i was inform that wires need to be replaces exactly as they were first installed because of a magented field. the have to be in a criss cross pattern, not parrell to each other. well if any knows the exact wire route for my truck ( not firing order) please let me know.,

ChevyTech007 Enthusiast

ChevyTech007

Posted
Posted

You can forget all the magnetic field BS. First thing I would do is make sure you do not have the wires crossed. On the left side of the cap (form front to rear) it is 1, 7, 3, 5. It is easy to get them crossed, everybody has done it. If that is OK I would replace the cap and rotor. Was it missing before you changed the wires?

braggent Enthusiast

braggent

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You can forget all the magnetic field BS. First thing I would do is make sure you do not have the wires crossed. On the left side of the cap (form front to rear) it is 1, 7, 3, 5. It is easy to get them crossed, everybody has done it. If that is OK I would replace the cap and rotor. Was it missing before you changed the wires?

 

 

 

no it was not missing before.plugs ,cap, rotor and wires brand new ac delco brand

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