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Thread: (Video) Random problem in my supercharged SBC.

  1. #1

    Default (Video) Random problem in my supercharged SBC.

    Hello mate. First, excuse me for my rookie language, I write from spaghetti Italy.
    Some months ago I bought a sports scar in England with a SBC & Holley EFI, and I have a big problem.

    This is the engine specs:
    Dart Little "M" 4 bolt block
    383 Eagle forged 4340 steel stroker crank with two 3/16" keyways
    Eagle H-beam Rods 5.7"
    JE forged 23° extreme duty inverted dome pistons giving 7.76:1 compression ratio
    ATI Supercharger Damper with two 3/16" keyways
    Comp Cams Nitrous Hydraulic Roller Cam CS NX288HR-13
    Comp Cams Hi-Tech Stainless Roller Rockers 1.5 ratio
    Comp Cams push rods
    Comp Cams Roller Timing Chain Set
    Comp Cams Billet 3 Part Timing Cover
    Pro Topline 23° Aluminum Lightening Heads 228cc Inlet Runners with 64cc chambers
    Fel-Pro 1034 Head Gaskets
    ARP Head Studs
    ARP Stainless 12 point bolts
    Manley Valves 2.08" Inlet 1.6" Exhaust (Spring Height 1.8")
    Comp Cams Valve Springs, Retainers, Seats and 10° Valve locks
    MSD Distributor 8366
    MSD Digital-6 Plus Ignition control
    MSD HVC coil
    ACCEL knock control linked to Holley ECU
    Holley Commander 950 MPFI System 65lb/hr Injectors With Wide Band Oxygen Sensor
    Holley Auxiliary Injector Driver Unit (Low Impedance Injectors)
    Aeromotive A1000 EFI Fuel Pump (High Pressure)
    Holley HP125 gerotor High Output Billet Fuel Pump x 2 (Low Pressure)
    Aeromotive Fuel Pressure Regulator #13101
    ProCharger D-1SC Supercharger with 12 Rib Drive

    In some moments, for 2/5 seconds, I have a random problem every 50/100 miles. Look at the rev counter, this happen WITHOUT pushing the clutch. Engine speed is almost constant, but backfires, and rev counter dance from 1000 & 2000 RPM. (When I understand something don't work well, I lift the accelerator.) The rest of the instruments works well and voltage is constant. I'm sorry but this in never happen during a EFI LOG.

    VIDEO:
    https://www.youtube.com/watch?v=cDy5...ature=youtu.be
    Another video in slow motion:
    https://www.youtube.com/watch?v=xgu3gCTegYE

    I hope someone have a idea about this problem. I hope it isn't a distributor problem, because here in Italy is hard to find someone who have a strobe pistol etc, etc. (I have already try to clean distributor pickup and pins, but no good news). Thank you for the reading and help if you can.

  2. #2
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,295

    Default

    Quote Originally Posted by key750 View Post
    MSD Distributor 8366
    Replace the ignition module with a genuine GM ignition module.
    (This same rationale applies to Ford TFI distributors too.)
    ‒ Ignition module for MSD 8366 Pro-Billet Distributors:
    GM 19179578
    ACDelco D1943A
    http://www.rockauto.com/dbphp/x,cata...CO_D1943A.html
    http://www.msextra.com/doc/ms1extra/...EI_modules.jpg
    ‒ I'd also verify the GM HEI module polarity is wired correctly:
    http://www.msdignition.com/forum/showthread.php?t=15
    http://www.megamanual.com/ms2/GM_7pinHEI.htm

    ‒ Apply heat sink (thermal conductive) paste on the bottom of the module before installing it.
    Often times, dielectric grease is wrongly used and will lead to an overheated (failed) module.
    May God's grace bless you in the Lord Jesus Christ.

    '78 BRONCO: 508" stroker, TFS heads, 11:1 comp ratio, Dominator MPFI & DIS, cold air induction, Spal dual 12" fans/aluminum radiator, dual 3" exhaust/Magnaflow mufflers, Moroso vacuum pump, Accusump, engine oil & trans fluid coolers, 100HP progressive dry direct-port NOS, A/C, LenTech Strip Terminator wide-ratio AOD/2500 RPM converter, 3:1 Atlas II, modified Dana 44/60-lockers-4.10s, hydroboost/4-disc brakes, ram-assist/heim joint steering, Cage long radius arms, traction bars, 4" Skyjacker lift, 35" mud tires

  3. #3

    Default

    Quote Originally Posted by Danny Cabral View Post
    Replace the ignition module with a genuine GM ignition module.
    (This same rationale applies to Ford TFI distributors too.)
    ‒ Ignition module for MSD 8366 Pro-Billet Distributors:
    GM 19179578
    ACDelco D1943A
    Done (after waited 15 days shipping).

    Quote Originally Posted by Danny Cabral View Post
    ‒ I'd also verify the GM HEI module polarity is wired correctly:
    http://www.msdignition.com/forum/showthread.php?t=15
    http://www.megamanual.com/ms2/GM_7pinHEI.htm
    I can't open this link. I have fitted with same polarity, because here in Pizza land (Italy) finding a strobe light (and someone who know how use here) for advance regulation is almost impossible, and for test if problem continue.

    Quote Originally Posted by Danny Cabral View Post
    ‒ Apply heat sink (thermal conductive) paste on the bottom of the module before installing it.
    Often times, dielectric grease is wrongly used and will lead to an overheated (failed) module.
    Applied. Thank you.

    RESULT: As before engine running perfectly, but every 80/100 miles, RPM counted dance and engine running rusty. Next, control wire connections? Thank you very much Danny.

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