Ignition noise thru the radio? - JeepForum.com
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post #1 of 18 Old 09-14-2012, 09:10 AM Thread Starter
02Lightning
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Ignition noise thru the radio?

Does anyone know what would cause ignition noise thru the radio? I just started hearing a click, click, noise that changes with engine speed. It sounds like a rock in the tire but through the radio speakers. I did pop the hood last night to see if I could see any sparks flying around the plug wires but I didnít see anything. It is time, or past due for new plugs and wires for it, I got about 60k on these, what type of plugs do Jeeps come from the factory with?


2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 130,000 miles
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post #2 of 18 Old 09-14-2012, 10:24 AM
PolkaPower
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Bad ground?
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post #3 of 18 Old 09-14-2012, 10:28 AM
FAlfani81
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Clicking and popping in speakers can be bad connections with the speaker wires. But the fact that you say its changing along with the RPMs it could be a bad ground. Is this a factory radio?

As for plugs, stick with Champion or AC Delco plugs. Don't get anything fancy, its a waste of money.
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post #4 of 18 Old 09-14-2012, 11:51 AM Thread Starter
02Lightning
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Not the factory radio, It’s a pioneer the previous owner put in. The speakers and amp are all factory. I’ve had the jeep six years and not messed with any of the radio wiring and it’s not been a problem. Looks like they used an aftermarket plug to go into the factory harness and then wired the radio to the plug with crimped connection. Also, I was just going to put in the cheep copper tip plugs. I’m curious how the plugs will look because I’ve never left any in that long.

2001 Jeep Grand Cherokee Laredo 4.0L NV242LD Transfer Case, 42RE, 130,000 miles
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post #5 of 18 Old 09-14-2012, 12:12 PM
mikelbca01
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I'm new to this community and not a Jeep experts, but I do a little about engine noise. Clicking and popping noises are an AC signal running through a DC path. This could be any ground or +12 volt wire connected to your radio. This includes the chassis of the radio, and antenna, as they also pass ground. If you don't have access to noise testing equipment, try isolating your ground connections to one by pulling the radio out of the dash (this will isolate the radio from chassis ground).

Now that you have eliminated the chassis as a possible noise path, there's a couple things we need to know. Does your radio include tape or CD? and does the noise happen with these sources as well?
If possible try a different audio sources. If you have noise on other sources besides AM/FM, disconnect the antenna (another ground source). If you still have noise with the chassis of the radio isolated and the antenna removed, then you have isolated the problem to three possible wires, constant power, accessory power, and ground.

This should keep you busy for a while, and what results from these suggestions will determine the next step. Let me know what results.
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post #6 of 18 Old 09-14-2012, 12:12 PM
KyleD31
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There's a built in amp or was it installed with the radio?
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post #7 of 18 Old 09-14-2012, 12:28 PM
mikelbca01
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Sorry, didn't see you last post. If you have factory amplifiers, this changes everything. What system do you have Bose? Infinity? etc...
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post #8 of 18 Old 09-14-2012, 01:06 PM Thread Starter
02Lightning
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Quote:
Originally Posted by mikelbca01 View Post
Sorry, didn't see you last post. If you have factory amplifiers, this changes everything. What system do you have Bose? Infinity? etc...
Built in amp, Infinity Gold.

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post #9 of 18 Old 09-14-2012, 01:12 PM
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All of the components are probably sharing a common ground. There is a noise filter you can put in to get rid of the noise. I have had squealing in my speakers before it was high pitch. I put in a filter and it went away
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post #10 of 18 Old 09-14-2012, 02:48 PM
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Go ahead and change the plugs and the wires, including the wire from the coil to distributor. Nothing fancy is needed, just OEM type wires and traditional plug like the Champion RC12LYC. All this should reduce the possibility of electromagnetic interference from the ignition system.
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post #11 of 18 Old 09-14-2012, 03:15 PM
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The infinity system is a 4-channel amplifier with low level input. If your Pioneer radio is connected to this amp with RCAs, pull the radio from the dash to get to the RCA output (If it connected some other way, please post description). With the radio on, hold a wire to the outside ring (shield) of the RCA output. Hold the other end of the wire to the Chassis of the Pioneer Radio. Does this cause the noise to decrease or go away? Or, get louder?

If it goes away, you need to make this connection permanent. What you are doing is bypassing the ground loop isolation circuit in the Pioneer radio.

If the noise increases, you could continue troubleshooting with the amp connected, but that will get complicated. Instead, I suggest you purchase an adapter that allows you to bypass the factory amp.

You can use any manufacturer's adapter, but here's one example from Metra:
http://www.metraonline.com/part/70-6513

This is an easy fix, and if it doesn't work, at least you have simplified the system to a point that makes it easier to troubleshoot (see previous post, if necessary). ; )
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post #12 of 18 Old 09-14-2012, 05:05 PM
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Put a set of 20.00 Denso wires and champion plugs and my noise went away. I change them out once a year just as regular maintenance.

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post #13 of 18 Old 09-14-2012, 06:50 PM
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Quote:
Originally Posted by mikelbca01
I'm new to this community and not a Jeep experts, but I do a little about engine noise. Clicking and popping noises are an AC signal running through a DC path. This could be any ground or +12 volt wire connected to your radio. This includes the chassis of the radio, and antenna, as they also pass ground. If you don't have access to noise testing equipment, try isolating your ground connections to one by pulling the radio out of the dash (this will isolate the radio from chassis ground).

Now that you have eliminated the chassis as a possible noise path, there's a couple things we need to know. Does your radio include tape or CD? and does the noise happen with these sources as well?
If possible try a different audio sources. If you have noise on other sources besides AM/FM, disconnect the antenna (another ground source). If you still have noise with the chassis of the radio isolated and the antenna removed, then you have isolated the problem to three possible wires, constant power, accessory power, and ground.

This should keep you busy for a while, and what results from these suggestions will determine the next step. Let me know what results.
A capacitor from RadioShack, installed as a "tee" connection in your radio power wire, then the opposite end of the capacitor soldered to a wire that you connect to the chassis somewhere for a ground, would shunt the AC current to ground. Capacitors pass the AC current, but block DC. It does not have to be a big one.

Sometimes alternators will cause this before failure.
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post #14 of 18 Old 09-14-2012, 06:57 PM Thread Starter
02Lightning
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Quote:
Originally Posted by mikelbca01 View Post
The infinity system is a 4-channel amplifier with low level input. If your Pioneer radio is connected to this amp with RCAs, pull the radio from the dash to get to the RCA output (If it connected some other way, please post description).
This is not hooked up with RCA's, the pioneer is just hooked into the factory harness.

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post #15 of 18 Old 09-14-2012, 08:31 PM
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Correct, the infinity amp is a high-level input (speaker level) rather than rca (low level.) Your alt could be showing it's age and not rectifiing the a/c voltage as it should. Some good troubleshooting ideas have been posted above and , if you had one available, you could also swap in a different deck to see if the problem goes away.

Also look at the quality of the crimps/splices between the harness adapter and the pioneer deck to see that a loose connection is not causing your issues. An intermitant connection would also manifest itself with popping noises in your speakers.
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