Need some advice

[alfred56]

Ok guys I am pulling hair out trying to figure this one out . I have real bad ignition noise on the mobile. I have bonded just about every thing I can think off. It has gotten better but makes radio almost unusable still. Any ideas I am willing to try anything right now. If you need some more info let me know

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[dirtyjob]

have you tried grounding the exhaust

[silvereagle1]

I've always heard grounding the exhaust helps but why the exhaust and is it not grounded already? I may try it myself.

[alfred56]

Yes in one spot also the heads to frame with one inch strap l am going to put one or treetop more on exhaust more

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[721HACKSAW]

You describe it as ignition noise... I wonder if it could be alternator or fuel pump instead. We need to try an isolate the source of the noise first. The noise goes away when the vehicle isn't running, correct?
For me it was the fuel pump, a small capacitor across the fuel pump cured most of the noise. A ground strap on the exhaust pipe also helped slightly.

[alfred56]

I know it is ignition when I disconnect msd noise is gone alt case is grounded and have can driven fuel pump

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[MDYoungblood]

Well you found your own problem, high performance ignition systems and radios don't mix. I would contact MSD Ignition, [Please login or register to view this link] , and ask what can be done to eliminate or at least reduce the spark chatter. I am guessing that you are running resistor plugs and new suppression wires.

3's

Greg

[alfred56]

Yes I am I contacted them first and of no help. All they could suggest was a capacitor they sell witch I have so I guys its time to take msd out

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[MDYoungblood]

Don't give up yet. When you disconnect the antenna (leave the MSD unit hooked up), do you still hear the ignition noise in the radio?

3's

Greg

[alfred56]

Will check after work

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[MDYoungblood]

Okay, we can give some advise then. Just a couple questions,
How is the radio wired?
Antenna location? Did you check/adjust the SWR? How is the radio mounted?

3's

Greg

[alfred56]

Antenna is dead center on roof hard mounted sirio 5000 wired direct too batt on positive and negative yo seat bolt radio is in a home made pedestal ABCs has strap to floor and have a 1.3:1 swr and the noise its not there when I disconnect the coax

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[MDYoungblood]

Okay, so it is the MSD unit since you said it doesn't do it when unhooked. First thing to try would be to ground (bond) the MSD box, it has a positive and negative lead but the negative just is for the circuitry in the unit and not a ground for the box itself. You said you used the cap that MSD recommended, that will do little to help. There is also the possibility that the unit is bad. Next it could be a bad rotor in the distributor, too much gap to the contacts, arching inside the distributor cap. It could be happening when using the MSD, but not with the stock system, take the cap off and check it, wash out any debris with water, give it a light spray of WD40 and wipe or blow it dry, a dab of dielectric grease on the center contact. We know it's not the wires and the plugs if it doesn't happen when unhooked.

3's

Greg

[alfred56]

Thanks Greg I will check the rotor and cap but I bonded the box today no better finish to throw another strap on the exhaust tomorrow and see if it is better

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