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Thread: Wrong plugs. Did I damage anything?

  1. #1

    Default Wrong plugs. Did I damage anything?

    The saga continues. My past post I was able to fix my lean issue by replacing a failed manifold gasket between cylinders #1 & #3. During the testing I got a set of NGK to replace my Autolight 3924. The counter dude gave me R5672A-8 (7173), which I thought were a replacement, but found out after today's not happy ride that they're heat range 8 and non-resistor.

    Did about 40 miles of driving on them. I noticed my A/F Ratio was not too far off and power was okay, but had a miss at highway cruise 3600 RPM. The car didn't feel 100% and it sounded rich with some backfiring on downshifts. So I thought maybe the plugs were fouled out and I should replace them. I checked a chart I found and it says I should use NGK FR8 (7373), heat range is 5 and it's a resistor. Just checking if this would've messed up my Holley Dual Sync/MSD coil or the computer in any way?

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,458

    Default

    No, they didn't damage anything.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  3. #3

    Default

    Danny, you're right. I changed the plugs, took the car out, and scared myself. Love it. No misses on downshifts, no more exhaust pop when cruising. Just Perfect! Thanks for the help!

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,458

    Default

    You're welcome, and thanks for the update.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

  5. #5

    Default

    It was because of the cold plugs, not because of the lack of resistor.

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    27,458

    Default

    Yes, exactly.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS T/W 11R 205 heads, 232°-244° duration/.623" lift/114° LSA camshaft, 12:1 C/R, TFS R-Series FTI ported intake, BBK 80mm T/B, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 200A 3G alternator, Optima Red battery, A/C, 100HP progressive dry direct-port NOS, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/off-road X-pipe/shorty headers, -6AN fuel system plumbing, Walbro 255 LPH pump, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, B&M Hammer shifter, FPP aluminum driveshaft, FPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 M/T Street Comp tires.

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