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0.042-0.046 is the correct gap for your spark plugs,If it is backfiring now and was not before make sure you were not sold platinum bosch plugs and if you are using factory plugs,then I be looking for a faulty spark plug.Also make sure the firing order is correct.
If it wasn't misfiring before. Make sure you have the proper gap on the spark plugs. Make sure you have the wires connected in the correct order. If you have the old wires, you may want to end up trying those one at a time to make sure you don't have a defect wire either. Thank you, Lee
Hello motokid40: My name is Roger and I will help you. The correct plug gap for the sp-432 plug is 0.044 in. Should you need further help please just ask. Please rate the answer. Thank You for using Fix Ya. Roger
AC 41803 Drivetrain:Four Wheel Drive; @Gap .045" This is a Platinum High Performance Spark PLug
Option : ASP AR25 EngineVIN:W; @Gap .045"@ High Performance
Stay away from those Gimmick Spark Plugs , they are just more money for nothing. A good platinum spark plug is all you need, the key is to gap it correctly to your application...
On GM products Vin # W it is .045 plug gap
On Gm products Vin # Z it is .035 plug gap
You will not have huge gains in fuel mileage from replacing spark plugs except to say that if your old ones are just extremely bad, there is no magical spark plug with extra mileage manufactured into it.... Hope this helps...
These engines use platinum plugs-you don't gap these type of plugs because you will damage te platinum electrode and cause misfire problems. Make sure you use bosch platinum factory recommended plugs and if he vehicle has more than 75k i would recommend replacing your plug wires as well/
At an auto parts store, if you tell them the car you have (year, make, and engine), they can look up the correct one for you. If you go with the Bosch Platinum +2 or Platinum +4, they'll come pre-gapped, so you don't have to gap them yourself. I was unable to find a listing for what the proper gap is, but at the store they can either tell you or sell you a pre-gapped plug that you won't have to worry about setting.