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Thread: Solving RF Interference Issues in Sniper EFI Installations

  1. #21

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    Quote Originally Posted by tdford5 View Post
    I could, but they're the same wires. This is all new. I just put on coil, box and distributor, removed the HEI distributor and install HyperSpark system and new wires with same MSD wires; only difference is the color.
    So MSD Street Fire Spark Plug Wire Sets 5552 and what part number for the spark plugs? Is there a good ground from the engine to the frame?

  2. #22

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    I have 0 AWG grounds to chassis and to battery, to the frame, to the engine block. Should I run a ground to the distributor? I can ground whatever I need to.

  3. #23

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    No need to ground the distributor. Just make sure all grounding points are clean and secure.

  4. #24

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    I know I have a engine to chassis ground in the front of the engine. I believe my back ground is engine to firewall, I'll double check this evening. So it's just the lack of proper grounding the cause of RFI noise?

  5. #25
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    23,415

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    No, it can also be caused by EFI wiring too close to high voltage components (spark plug wires, ignition coil, distributor, etc.)
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: 385" SBF, Dart SHP 8.2 block, TFS TW 11R 205 heads, 11.8:1 comp, TFS R-Series intake, Dominator MPFI & DIS, 36-1 crank trigger/1x cam sync, 160A 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, S&W subframe connectors, LenTech Strip Terminator wide-ratio AOD/3000 RPM converter, 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 & MT 245/45R17 tires.

  6. #26

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    So after pulling out wires I have three 14 AWG power wires in the same loom as my Sniper & HyperSpark wiring, but why does Holley run there hot/ignition hot wires along with the points wire (white)? Also, does the location of the ignition box matter? I've also check my grounds currently 0 AWG OFC wire - engine to battery, frame to battery, engine to firewall. I'll add a engine to frame in the next couple days. Also, I'll loom the HyperSpark & Sniper wires by themselves, hopefully this will work
    Last edited by tdford5; 01-15-2020 at 05:50 PM.

  7. #27
    Join Date
    May 2014
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    Bostwick, GA
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    Quote Originally Posted by tdford5 View Post
    I replaced wires as I installed new I HyperSpark system (box, coil & distributor). I know it's not the fix, but just wanted to make sure what the issue was. So MSD Street Fire Spark Plug Wire Sets 5552 is what I put on. So now is it coming from the wires or distributor? I attached a couple photos. Please don't mind the mess I wanted to make sure everything was going to work before looming all the wires. I'll take any help on how to stop this and make it work. Thanks.
    A dumb? Can the RFI signal be carried by the stainless wrap on those hoses?
    The reason I ask is, the hose lays on the plug wires, and is nearly touching the Sniper body.
    Injector Inspector
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  8. #28

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    Quote Originally Posted by tdford5 View Post
    So after pulling out wires I have three 14 AWG power wires in the same loom as my Sniper & HyperSpark wiring, but why does Holley run there hot/ignition hot wires along with the points wire (white)? Also, does the location of the ignition box matter? I've also check my grounds currently 0 AWG OFC wire - engine to battery, frame to battery, engine to firewall. I'll add a engine to frame in the next couple days. Also, I'll loom the HyperSpark & Sniper wires by themselves, hopefully this will work
    The Sniper and HyperSpark power wires go straight to the battery. The ignition wire is 12V, but low amperage.
    You need to study RFI/EMI and understand transducer vs transmitter and how it relates to communication wiring. I know it sounds like a lot, but luckily we're only dealing with DC circuits here. I have Ferrite RFI Suppressors on my HyperSpark and Sniper power wires at the battery. Most likely overkill, but they are there. I have loomed all wires separate as well. The engine to frame ground should help.

    Quote Originally Posted by Chuck L. View Post
    A dumb? Can the RFI signal be carried by the stainless wrap on those hoses?
    The reason I ask is, the hose lays on the plug wires, and is nearly touching the Sniper body.
    I'd say no, but I've seen some weird stuff in my days so it could always be possible. The path of least resistance applies.

  9. #29
    Join Date
    Sep 2015
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    Palm Bay, FL
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    167

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    Quote Originally Posted by Chuck L. View Post
    A dumb? Can the RFI signal be carried by the stainless wrap on those hoses?
    The reason I ask is, the hose lays on the plug wires, and is nearly touching the Sniper body.
    Sure it can! Any time you put metal in an electromagnetic field you're going to induct power into that metal. And then there's the potential of turning that into an antenna or guide that transmits that field elsewhere. I'd remedy that situation, even if it's not the cause of your problem.
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  10. #30

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    OK pulled Sniper/HyperSpark wires out of loom and ran them by themselves got a little better like 20%. Starts but still sputters. I going to loom up spark plug wires and get up and away from the engine block/braided hoses. I do have some extra ferrite snap on beads, snap on style. I may put them on the power wires going to the battery from Sniper system. And yes, again I should have plenty of grounds, these are my 0 AWG wire grounds (engine to chassis, engine to firewall, engine to battery, chassis to battery) so hopefully we can put the ground issues to rest here.

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