I want to change my spark plugs in my Venture 2002, but the back 3 are too hard to get at. Is there any good reason that I can't at least replace 3 of the 6 plugs. Or is it all or nothing deal? I will be selling the van in a year from now, so will put a cheap pair of plugs to replace. (I been getting bad mileage recently, so replace air filter, which was in a sad shape. Also, put fuel injector cleaner in the gas). Thanks
if your van is mis-firing then you could get away with just replacing the plugs that are defective. Most people replace all the plugs at once.
=46rom your description it would seem that your van has accumulated a lot of deferred maintenance. Replace them all. And replace all hoses and belts if needed. And replace fluids and filters as needed. Etc., etc.
why would you replace 3 of 6 spark plugs with CHEAP plugs and expect to get better gas mileage? if you are going to half ass it, don't do it at all.
If it has the original GM plugs with the tiny platinum tip and less that
100K on it, they'll possibly be better, used, than new aftermarket plugs anyway. s
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