autolite 25 problems

[DCjuggalo]

does anyone use the autolite platinum 25's ? ???


i bought them for my 88 302, i wanted to get 24's like u guys talk about but pep boys said the 25 was what i needed.
so anyways i cant get them to fit, i tried for about 10 minutes and gave up. the thread want even catch.. then i put the old ones back in.

 

[281pony]

im not familiar with the platinum plugs, are the bodies any different then the standard plugs?

i used autolite 25's with no problems. what kind of heads do you have?

 

[DCjuggalo]

as far as i know they're stock e7 heads..
i compared the 2 plugs when i had it out and the diameter of the ap25 plug right above the threaded section is alot bigger

damn can't take em back tho cause i threw away the receipt

 

[87fcoupe]

First all you don't want platinum.Second autolites 25 is correct plugs if you have stock heads.Look and make sure they are autos 25 NOT 3925's ok.

 

[HISSIN50]

efi 5.0's seem to like copper plugs. some people have idle and high rev issues with plats (plat does not conduct nearly as well as copper).

 

[tonydalrymple]

efi 5.0's seem to like copper plugs. some people have idle and high rev issues with plats (plat does not conduct nearly as well as copper).

Agreed. Last year I installed platinum plugs. 500-600 miles afterward; i developed a higher rpm miss. I found dozens of threads of people with platinum plugs & issues. I swapped in regular Autolite #25's & the problems went away....

 

[HISSIN50]

Agreed. Last year I installed platinum plugs. 500-600 miles afterward; i developed a higher rpm miss. I found dozens of threads of people with platinum plugs & issues. I swapped in regular Autolite #25's & the problems went away....

exactly. often the idle is a bit low with plats and people get a high speed misfire (often around 4K-4.5K rpm).

 

[PNY PWR]

Never use platinum plugs unless the motor calls for them or came with platinums from the factory.

You want either the regular Autolite 25's or Motorcraft ASF42C's.

 

[wagnermotors]

25

i had this same problem but it was with my f150 it was due to the headers i had on there the fatter part of the plugs rubs up on the headers i had to use autolight 2545 they are from the crown vic of the same year and motor my f150 was also a 88

 

[Mustang5L5]

Don't use autolites Get the motor craft oem copper plugs. The specs are tighter.

 

[281pony]

wow... 6 year old thread revival?

didn't know i was on this forum back in 04' lol.

 

[MustangLX-5.0]

Motorcraft plugs FTW. Never had such a smooth running engine til I used Motorcraft plugs. Forget Autolites.. those things are garbage. Always ran into some kind of trouble later on whenever I used those. Not enough copper in them .. if any, I would assume. Best bet, use what was meant for this engine.... after all, Ford makes them.