Spark Plugs

slb351

slb351

Forum Member
To make a long story short I bought a 90 mustang GT with a rebuilt title. I'm attempting to change the spark plugs but the Motorcraft replacements don't fit. I called AutoZone for a plug reference and I have the correct plugs for a 90GT. The plugs that are in it now are AC Delco 11 (whatever that is). There is a stamping on the AC plug that says E934. Can anyone tell me what AC Delco 11 plugs go to? So I can try and figure out what I have under the hood. As far as I can tell the heads are stock.

Thanks
Steve
 
the one on the left was in it?


so you have extended reach plugs, hmm...

can you look in the hole and see if you actually need them?

aluminum or iron heads?

sparkplugs031.jpg
 
Last edited:
dave89iroc said:
the one on the left was in it?


so you have extended reach plugs, hmm...

can you look in the hole and see if you actually need them?

aluminum or iron heads?

Correct the one on the left was in it.

What would I be looking for to tell if I need them?

Iron heads.
Click to expand...
 
Check the gap, see how much wider it is than specified to determine wear on the electrode, check the porcelen for the color, you want a tan to white-ish color, and if the electrode is really rounded off or en-even, then they are worn and need replaced
 
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