If using standard copper core spark plugs, every 30,000 miles. If using platinum plugs, up to every 100,000.
Change the plugs at 100,000 miles or earlier if the engine is not performing as it should.
According to the owners manual, they have platinum plugs that should be changed at 100,000 miles.
If they are platinum plugs, should be every 95,000 to 100,000 miles.
when do you change spark plugs
The original plugs should be good for around 100,000 miles ( 160,000 ) kms. Take it from there.
Change the plugs and wires at 100,000 miles unless you experience poor performance or a drop in MPG. In that case change them sooner.
there is no need to change the coil packs just to do routine maintanence
60,000 miles.
at about 40K
Depends on the type of spark plugs. Factory plugs around 70 - 100k depending on the condition of the plugs. I would replace the spark plugs out with some AC Delco iridium plugs they will last you 100k+.
In order to change the sparks plugs in a Chevy Express 3500 van, you should first remove the front tires. This will allow you to get to the front six plugs. The doghouse also needs to be pulled in order to get to the last two spark plugs.
You should replace your spark plugs at about 60,000 miles if you drive your car rough or as they call it "lead foot". If not you should be able to get about 90,000 out of them. Just remember that the sooner you change them the sooner you can get power and fuel economy back.