Plug brand/model/gap

[Bobs21x]

Trying to iron out tune up issues.
What plugs should I look for on my stock LX 3.8?

I’ve tried a few and just not happy

 

[Rodeo Joe]

I stick with Motorcraft without any issues.

Joe

 

[KevinVarnes]

I used to run Motorcraft or Autolites in my old 3.8. NGK also makes good plugs. What have you tried and what are you not happy about with them?

 

[Jae 'Bird]

I put NGK platinum plugs in last summer, I gapped them correctly and they seemed to work super well, I guess we'll see how they held up with storage when I pull the car out in spring. I should note that when I did that I also replaced the plug wires, distributor cap and rotor, which I don't think you have on the 94 so ymmv. but NGK seems to make good stuff

 

[Bobs21x]

Chasing bad acceleration and rich running conditions after head gasket rebuild. I have added coil, plugs, wires, IAC, TPS. No lights or codes so I am hoping I got bad parts from the Rock! lol

 

[Grog6]

Did you do a compression test after? Low compression will cause it to show rich by poor combustion.
Don't use plugs with skinny middle electrodes; our coils eat them.

 

[Grog6]

This is the data I have for a 4.6, I DNK what a v6 takes.
MOTORCRAFT
AWSF-32C / stock heat range - copper plug
AWSF-22C / 1 Heat range colder - copper plug
AWSFA-12C / 2 Heat range cooler - copper plug
AGSF-32C/ Recommended for FRPP heads(not sure on heat range)

NGK
TR-55/ 3951/ Stock Heat Range
TR-6/ 4177/ 1 Step Colder
BP7EFS (PN - 3526) BR7EF (PN - 3346) two steps
R5724-8 (PN - 7317) two and a half steps
R5724-9 (PN - 7891) three steps
R5724-10 (PN - 7993) four steps

AUTOLITE
764s / Stock
103s / 1 heat range cooler < this is what I'm putting in. Autolite makes the Motorcraft brand.
AR94 / 2 heat range cooler
AR93 / 3 heat range cooler
AR92 / 4 heat range cooler

CHAMPION
YS-59C / -3 or -4 below stock heat range

DENSO
IT16 / stock heat
IT20 / -1 heat range
IT22 / -2 heat range
IT24 / -3 heat range

Small update

Motorcraft sparkplugs have changed part #'s and some are now only aval in a full thread design, new part #'s are as follows......

SP-447 replaces the AWSF-32-C & AGSF-32-C, Full Thread design-stock heat range in a copper core
SP-505 replaces the AWSF-22-C & AGSF-22-C, Full Thread design-1 step down from stock, also copper core
SP-494 replaces the AWSFA-12-C still a 1/2 thread design-2 steps down from stock, copper core

 

[Ericv8thunderbird]

I always run Motorcraft in all my Ford’s.

Just my personal opinion, but when it comes to timing and ignition, it should always be OEM.