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this shows info and repair for the p0526 its basically the fan clutch but on an envoy and trailblazers their electronic- prices vary but if this code popped up after changing plugs check the connections and harness for disconnect or damage ---recheck the plugs that the coil s are good and wires are on tight https://www.youtube.com/watch?v=UxwUvTiqtTA
Natalie, our 4.2 engine only likes 1 sparkplug. AC Delco 41-103. This Iridium plug comes pre-gapped, to near the specs Mike posted. Don't try and gap these particular plugs yourself, easy to ruin them.
On he very top of your engine, there will be six coil pack, they all look the same, from front to rear of engine, remove 10mm bolt, disconnect elec. harness, pull coil pack out, spark plug will be in there, do one at a time, this is the spark plug gap .044"
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...
they come pre gapped with collars to prevent the electrodes from getting bent .platinum and iridium plugs will have the surface damaged if you were to adjust them with a feeler gauge,like old plugs had to be gapped. ac or ngk plugs come pre gapped in the box.
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