Sxynerd

I change mine whenever I start diagnosing a problem, lol. I've never had a bad plug yet!

teej281

So why is it bad to run a colder plug???

Sxynerd

Because it will weaken the amount of time it takes to ignite the fuel and there by rob you of power. (there's technical terms for it all I just do care to look it up.) NA cars usually step up to a hotter plug but in Modular applications, I don't see it helping much with stock compression and stuff.

04CompetitionOrange

I wussed out.

I took off the passenger side fuel rail and 1st coil pack and got to looking at the plug waaaayyyyy down in there. Then I turned my head and got looking at the last plug by the firewall on the passenger side. I need to get a good torque wrench and the right spark plug socket before I go for this.

I haven't had any issues, so I am just going to wait until I am closer to 100k. Thanks for the info guys.

Sxynerd

Don't be a wussy, just remember your left hand is strong enough to tighten the SP to spec. Don't over tighten.

03BottleFedGT

they arnt as bad as they seem you dont even have to take the fuel rail off. ive got the stuff to do it i can help ya change them this weekend.

jtfrog

I just put in the E3 plug and they seem just fine. Get a 1/4 drive torque wrench with an adapter for 3/8 and its so easy.

mustang_pa

Damn, i changed mine just yesterday. As soon as i feel they aren't firing right i change them. They look good except for the 1st one closes to the radiator it was all rusted out. That was my miss i was having at high rpms

devongarver

here is the plug list for dif. brands.

MOTORCRAFT

PART# / HEAT RANGE
AWSF-32C / stock heat range - copper plug
AWSF-22C / 1 Heat range colder - copper plug
AWSFA-12C / 2 Hea range cooler - copper plug
AGSF-32C/ Recommended for FRPP heads(not sure on heat range)

NGK

PART# / HEAT RANGE
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

PART# / HEAT RANGE
764s / Stock
103s / 1 heat range cooler
AR94 / 2 heat range cooler
AR93 / 3 heat range cooler
AR92 / 4 heat range cooler

CHAMPION

PART# / HEAT RANGE
YS-59C / -3 or -4 below stock heat range

DENSO

PART# / HEAT RANGE
IT16 / stock heat
IT20 / -1 heat range
IT22 / -2 heat range
IT24 / -3 heat range