Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: Ignition Module Buzz

  1. #1

    Question Ignition Module Buzz

    I am defeated. I started having symptoms of my ignition module failing, and after pulling off the old one, I realized that the connections from the pickup to the module were very rusted. So I just bought a new pickup & module, reinstalled in it the car and fires right up. Much better than before, and throttle feels way smoother. After letting it warm up, I noticed it had a bit more surge at idle than usual, but it didn't really bug me. Go driving, car is running better than ever. Get back home, park it, and turn it off. When I turn it off, there's a incredibly loud buzzing sound coming from the distributor that was not there before the module replacement. The loud buzzing goes away after a relay kicks off inside the car, 4-5ish seconds. Thought that was weird and went to the parts store to get another ignition module, and it's doing the exact same thing.

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

    Default

    Which distributor is this, and what does your ignition system consist of?
    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

    Ignition setup. I have the MSD Pro Billet HEI distributor.

  4. #4
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,295

    Default

    Are you using a genuine GM HEI ignition module? If not, start there.
    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

  5. #5

    Default

    I'm just using a BWD module from O'Reilys, is that not considered a genuine GM HEI module?

  6. #6
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,295

    Default

    BWD is not GM.
    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

  7. #7

    Default

    Oh brilliant. Whoops, I'll give a update when I get one.

  8. #8
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,295

    Default

    I'm not sure it's your problem, but those distributors don't like cheap ignition modules.

    Defective ignition modules - common problem with MSD 8366 distributors.
    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.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

  9. #9

    Default

    I can't win. Car seems to run fine with this module, but now when I turn it off, there's still a noise, just a different one. The noise sounds exactly like a electric BBQ igniter, and only lasts for a few seconds, until the relay clicks off inside my car.
    EDIT: After letting the car warm up, it started to run more & more like it had a miss, and less smooth throughout the entire rev range. And at idle, it had a bit of unsteady surge to it.
    Last edited by Sneddon; 01-31-2017 at 08:55 PM.

  10. #10
    Join Date
    Dec 2009
    Location
    Connecticut
    Posts
    19,295

    Default

    Quote Originally Posted by Sneddon View Post
    The noise sounds exactly like a electric BBQ igniter, and only lasts for a few seconds, until the relay clicks off inside my car.
    Are you referring to the EFI system relay on the main harness? If so, that should click off as soon as the ignition switch is turned off.
    http://forums.holley.com/showthread.php?19171-Run-On (For my own reference.)
    http://forums.holley.com/showthread....r-Off-Problems (For my own reference.)

    EDIT: After letting the car warm up, it started to run more & more like it had a miss, and less smooth throughout the entire rev range. And at idle, it had a bit of unsteady surge to it.
    This seems like the Learn Table being corrupted from ignition misfires. Do not "Transfer Learning To Base" until you get this resolved, because you may need to "Clear" the Learn Table.
    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

Page 1 of 2 12 LastLast

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
About us
Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors have powered every NASCAR® Sprint® Cup team and nearly every NHRA® Pro–Stock champion for four decades. Now, Holley EFI is dominating the performance world as well as our products for GM's LS engine. Holley's products also include performance fuel pumps, intake manifolds & engine dress–up products for street performance, race and marine applications. As a single solution, or partnered with products from other Holley companies - Hooker Headers, Flowtech Headers, NOS Nitrous, Weiand, Earl's Performance Plumbing, or Diablosport - Holley products can give you the edge you need over the competition.
Join us