Will cooler plugs cure lean running 98GT?
 

Running stock plugs still-
pro-m77,shm h-pipe w/cats,svo pulleys,flows,
3.73's-
Bothersome higher rpm pinging under full
throttle w/89 octane,slightly less with 92-
any ideas?

If your pinging stops with some octane booster than I would should suggest, drainging your EEC. Disconnect your negative cable from the batter. Wait for the light onthe hood to dim out, and then leave the driver's door open for 3 min. Reconnect the cable. It might run rough for a while, but thats because the EEC needs to relearn its adaptive stategy. If it still runs lean after a couple days, let us know.

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'94 Cobra
308ci, ported GT-40 heads, Crane 2031 cam .513"/.529" lift 276°/282° duration, 70mm TB, Custom 80mm MAF, JMS chip, Vortech S-trim 8#, MSD, TREX fuel pump, Accel coil, 3.55's, FMS 1 5/8 headers, BBK Offroad H-pipe, and 2-chamber flows.
1994 Mustang Cobra
Check out the pics of my Motor Buildup!

thanx,I will give that a try-

Replace the factory spark plugs with NGK TR-55 which are a little colder if resetting the computer doesn't help. The factory Platinum plugs aren't good for performance just last a long time. Let us know your findings.

John Edwards
Mod Motor # 2
13.71 @ 100.69
Yellow 99 GT

Also if you have a 99 GT Pro-M recalled their 77mm meters for improper calibration.
I sent mine back and had it recaibrated. Haven't run it yet to see the diffrence. Mine would also ping on the 2-3 shift but I just retarded the timing a little with my steeda timing adjuster.

Mine did that too until I had my Pro-M recalibrated. Everything runs smooth now.



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99 Laser Red GT
Mods: 70mm TB, Level 10 Chip, FMS 3.73's, Sean Hyland Speedo Recalibration kit, Pro 5.0 Shifter, & Pro-M 77mm MAF.
DynoJet: 242HP/286 Lb/ft
Best 1/4: 13.839@99.1MPH on radials.

What gap on the TR55'S?-
98 GT= SHM H-PIPE,SVO PULLEYS,PRO-M77,
2 CHAM. FLOWS,PRECISION 3.73'S-
212 RWHP / 277 RWT