Changed plugs and wires this weekend on my 2000 Coupe.
Installed AC/Delco 41-962 and MDS 8.5 wires.
When I removed the previous plugs 5 holes had AC/Delco R44LTSM plugs and the other 3 had AutoliteXP 5245
Any ideas as to why the previous owner would put in these plug combination
MVZ

 

Car had a misfire so they only changed the suspecting plugs--For best performance all the plugs should be the same part # and brand---Mostly because there is a variance in heat ranges between brands of similar plug applications---- I'm sure they were all gapped similarly--but more important is having the exact same heat range in all 8 cylinders-

 

All the plugs looked good no fouling evident. Dont know if the Autolites are a hotter plug put in for issue

 

[QUOTE=Vett4MVZ;1590384019]
All the plugs looked good no fouling evident. Dont know if the Autolites are a hotter plug put in for issue[/QUOTE


Maybe the last guy just changed the easy ones.
Its tempting on my C4.
The back two on the right are a pain to get to. And all the wires on the left are a Pain in the A _ _. Oh yes and the fuel filter.

 

QUOTE" Any ideas as to why the previous owner would put in these plug combination?

YES! STUPIDITY & LAZYNESS! Its just PAIN WRONG and there should NOT be any doubt in your mind that they should all be ONE brand and all the same plug! PERIOD!

Make it correct and DRIVE ON!

What else is MICKEY MOUSED????

Bill

 

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When I was wrenching I was a firm believer in what plugs were required .
Fords= Autolite or Motorcraft // Chrysler = Champion // GM= AC only

Also had people buying from Meijer stores all junk !!!!!!

 

I agree.

 

Could be a number of reasons for the different plugs, but you did the right thing putting AC Delco plugs back in the car.