North American Turbocoupe Organization

Spark Plug Change Interval
Mikey97D Offline
Senior Member
How often is everyone changing their plugs?  
Please list what boost psi you are running and gap too?
1988 TC, 5 spd, Stinger 3" Exhaust, Schneider Roller Cam, -4° Cam Pulley, Cone Filter, Gilles Boost Control Valve set at 17 psi, Walbro 255 lph, CHE Rear Lower and Upper Control Arms, Braided Brake Lines, Hawk HPS 5.0 Front and HPS (F) Rear, CRES Inserts in front calipers, and '93 Cobra Wheels with General 235/50R17 Tires.   

Jeff K Offline
I use NGK 2238 plugs with a gap of .030". Running 24 psi boost with methanol injection. I change the plugs every 10K to 12K miles. I will notice a little bit of a WOT / high boost miss in the 10K to 12K mile range, which is my clue to change the plugs.
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
11 Crown Vic Interceptor
14 Toyota Camry (wifes car)
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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Kuch Offline
Senior Member
I also run the NGK 2238's @.030, I change them in the spring when the car comes back out for the summer season. I put maybe 5,000 miles a summer on it. I know I can go further between changes, but it's part of my annual spring prep. oil/filter change, plugs, clean cap and rotor, check belts and hoses.
1988 Turbo Coupe, Black/Black, 5 Speed, Moonroof,  T3/T4, ported E6, 255LPH, Kirban, Stinger Exhaust, MGW shifter, K&N, Gillis valve, BP1.5, PIMPx, Koni's
1964 Ford Galaxie 500XL, 390 6V, Big Solid cam, Headers,3.89's, 4 Speed, Vast and fast
1960 Ford Starliner, 292 Y Block, 312 4bbl intake, headers, 3 Speed, slow and low
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