99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

Hi,

My trusty '99 Cherokee Sport 4.0 liter just went in for a 50k checkup.
The dealer put in a new set of plugs, a new distributor cap/rotor, and
a new sparkplug wire set as part of the normal maintenance. The
vehicle runs great, but I now have impulse ignition noise in my FM 2
way equipment (220 mhz) that I did not have before. The new plugs are
Champion RC12ECC (resistor suppressor) and the new ingition wiring is
Mopar (Ignition suppressor wires) so I am puzzled. I never had any
ignition noise issues with the OEM stuff for the first 50k miles, but
now, even with portable equipment 10 feet away from the vehicle, I can
hear fairly strong impulse noise.

I checked all the wiring to assure that everything was seated
correctly and nothing looks out of place.

Does anyone know if the stuff they put in is more poorly suppressed
than what was installed originally by Chrysler? Has anyone had better
luck with different brands of plugs or wire sets? I'm just looking
for a little input before I discuss the issue with my dealer.

Thanks,

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

Take it back to them, you have a broken spark plug insulator or an
open gap in the ignition wire. You should be able to hear it on your AM
radio reception.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ender wrote:
>
> Hi,
>
> My trusty '99 Cherokee Sport 4.0 liter just went in for a 50k checkup.
> The dealer put in a new set of plugs, a new distributor cap/rotor, and
> a new sparkplug wire set as part of the normal maintenance. The
> vehicle runs great, but I now have impulse ignition noise in my FM 2
> way equipment (220 mhz) that I did not have before. The new plugs are
> Champion RC12ECC (resistor suppressor) and the new ingition wiring is
> Mopar (Ignition suppressor wires) so I am puzzled. I never had any
> ignition noise issues with the OEM stuff for the first 50k miles, but
> now, even with portable equipment 10 feet away from the vehicle, I can
> hear fairly strong impulse noise.
>
> I checked all the wiring to assure that everything was seated
> correctly and nothing looks out of place.
>
> Does anyone know if the stuff they put in is more poorly suppressed
> than what was installed originally by Chrysler? Has anyone had better
> luck with different brands of plugs or wire sets? I'm just looking
> for a little input before I discuss the issue with my dealer.
>
> Thanks,
>
> Ender
>
> "The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

Take it back to them, you have a broken spark plug insulator or an
open gap in the ignition wire. You should be able to hear it on your AM
radio reception.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ender wrote:
>
> Hi,
>
> My trusty '99 Cherokee Sport 4.0 liter just went in for a 50k checkup.
> The dealer put in a new set of plugs, a new distributor cap/rotor, and
> a new sparkplug wire set as part of the normal maintenance. The
> vehicle runs great, but I now have impulse ignition noise in my FM 2
> way equipment (220 mhz) that I did not have before. The new plugs are
> Champion RC12ECC (resistor suppressor) and the new ingition wiring is
> Mopar (Ignition suppressor wires) so I am puzzled. I never had any
> ignition noise issues with the OEM stuff for the first 50k miles, but
> now, even with portable equipment 10 feet away from the vehicle, I can
> hear fairly strong impulse noise.
>
> I checked all the wiring to assure that everything was seated
> correctly and nothing looks out of place.
>
> Does anyone know if the stuff they put in is more poorly suppressed
> than what was installed originally by Chrysler? Has anyone had better
> luck with different brands of plugs or wire sets? I'm just looking
> for a little input before I discuss the issue with my dealer.
>
> Thanks,
>
> Ender
>
> "The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

Take it back to them, you have a broken spark plug insulator or an
open gap in the ignition wire. You should be able to hear it on your AM
radio reception.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

Ender wrote:
>
> Hi,
>
> My trusty '99 Cherokee Sport 4.0 liter just went in for a 50k checkup.
> The dealer put in a new set of plugs, a new distributor cap/rotor, and
> a new sparkplug wire set as part of the normal maintenance. The
> vehicle runs great, but I now have impulse ignition noise in my FM 2
> way equipment (220 mhz) that I did not have before. The new plugs are
> Champion RC12ECC (resistor suppressor) and the new ingition wiring is
> Mopar (Ignition suppressor wires) so I am puzzled. I never had any
> ignition noise issues with the OEM stuff for the first 50k miles, but
> now, even with portable equipment 10 feet away from the vehicle, I can
> hear fairly strong impulse noise.
>
> I checked all the wiring to assure that everything was seated
> correctly and nothing looks out of place.
>
> Does anyone know if the stuff they put in is more poorly suppressed
> than what was installed originally by Chrysler? Has anyone had better
> luck with different brands of plugs or wire sets? I'm just looking
> for a little input before I discuss the issue with my dealer.
>
> Thanks,
>
> Ender
>
> "The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

On Wed, 10 Dec 2003 17:48:25 -0800, L.W.(ßill) ------ III
<----------@cox.net> wrote:

> Take it back to them, you have a broken spark plug insulator or an
>open gap in the ignition wire. You should be able to hear it on your AM
>radio reception.
> God Bless America, ßill O|||||||O
>mailto:-------------------- http://www.----------.com/
>

Thank you for your response.

That is another oddity about this problem, which I failed to mention.
There is no ignition pulse noise on the AM radio, even in the absence
of a signal or with a distant station. Broadcast FM is not a problem
either. The problem is very pronounced, however, above 150 mhz, and
is easily detected from 10 feet away with a 220 mzh HT, as well as
with the onboard 220mhz equipment. This is a real mystery to me as I
would have suspected that the cowl mount antenna right by the engine
compartment as well as the lower frequency of the broadcast band (and
the nature of the AM detector) would have been most susceptible.

Regards,

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

On Wed, 10 Dec 2003 17:48:25 -0800, L.W.(ßill) ------ III
<----------@cox.net> wrote:

> Take it back to them, you have a broken spark plug insulator or an
>open gap in the ignition wire. You should be able to hear it on your AM
>radio reception.
> God Bless America, ßill O|||||||O
>mailto:-------------------- http://www.----------.com/
>

Thank you for your response.

That is another oddity about this problem, which I failed to mention.
There is no ignition pulse noise on the AM radio, even in the absence
of a signal or with a distant station. Broadcast FM is not a problem
either. The problem is very pronounced, however, above 150 mhz, and
is easily detected from 10 feet away with a 220 mzh HT, as well as
with the onboard 220mhz equipment. This is a real mystery to me as I
would have suspected that the cowl mount antenna right by the engine
compartment as well as the lower frequency of the broadcast band (and
the nature of the AM detector) would have been most susceptible.

Regards,

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

On Wed, 10 Dec 2003 17:48:25 -0800, L.W.(ßill) ------ III
<----------@cox.net> wrote:

> Take it back to them, you have a broken spark plug insulator or an
>open gap in the ignition wire. You should be able to hear it on your AM
>radio reception.
> God Bless America, ßill O|||||||O
>mailto:-------------------- http://www.----------.com/
>

Thank you for your response.

That is another oddity about this problem, which I failed to mention.
There is no ignition pulse noise on the AM radio, even in the absence
of a signal or with a distant station. Broadcast FM is not a problem
either. The problem is very pronounced, however, above 150 mhz, and
is easily detected from 10 feet away with a 220 mzh HT, as well as
with the onboard 220mhz equipment. This is a real mystery to me as I
would have suspected that the cowl mount antenna right by the engine
compartment as well as the lower frequency of the broadcast band (and
the nature of the AM detector) would have been most susceptible.

Regards,

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

On Wed, 10 Dec 2003 19:56:05 -0500, Ender
<enderwiggin3rd@SBhotmail.com> wrote:

>Hi,
>
>My trusty '99 Cherokee Sport 4.0 liter just went in for a 50k checkup.
>The dealer put in a new set of plugs, a new distributor cap/rotor, and
>a new sparkplug wire set as part of the normal maintenance. The
>vehicle runs great, but I now have impulse ignition noise in my FM 2
>way equipment (220 mhz) that I did not have before. The new plugs are
>Champion RC12ECC (resistor suppressor) and the new ingition wiring is
>Mopar (Ignition suppressor wires) so I am puzzled. I never had any
>ignition noise issues with the OEM stuff for the first 50k miles, but
>now, even with portable equipment 10 feet away from the vehicle, I can
>hear fairly strong impulse noise.
>
>I checked all the wiring to assure that everything was seated
>correctly and nothing looks out of place.
>
>Does anyone know if the stuff they put in is more poorly suppressed
>than what was installed originally by Chrysler? Has anyone had better
>luck with different brands of plugs or wire sets? I'm just looking
>for a little input before I discuss the issue with my dealer.
>
>Thanks,
>
>Ender
>
>"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Just in case anyone else runs into this problem, I did finally find
the solution to the massive ignition noise problem on my 220 mhz radio
equipment.

After replacing the Champion plugs with Autolite Resistor plugs, and
the Mopar ignition wiring with Autolite Professional Suppression wires
and getting no improvement, I moved on to the distributor cap and
rotor.

It turned out to be the replacement distributor cap and rotor that my
dealer installed during my tune up. It had all aluminum fittings and
used a carbon button to transfer spark from the ignition coil to the
rotor inside the cap. While this caused absolutely no noise on the
AM/FM broadcast bands, it absolutely ripped up the vhf/uhf bands on my
ham gear with spark noise. There was nothing wrong with the
replacement cap and rotor, no cracks or loose hardware, and the engine
ran perfectly with these "noisy" tune up parts. I replaced the cap
and rotor installed by my 5 star dealer with "Standard" brand brass
fitted replacements (from Acme Auto) and the problem was instantly
resolved. The "quiet" distributor cap has the brass spring-loaded
button that makes contact with the rotor, which is also brass. It is
absolutely silent on the vhf/uhf bands.

Hope this helps anyone who runs into this issue.

Regards,

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

On Wed, 10 Dec 2003 19:56:05 -0500, Ender
<enderwiggin3rd@SBhotmail.com> wrote:

>Hi,
>
>My trusty '99 Cherokee Sport 4.0 liter just went in for a 50k checkup.
>The dealer put in a new set of plugs, a new distributor cap/rotor, and
>a new sparkplug wire set as part of the normal maintenance. The
>vehicle runs great, but I now have impulse ignition noise in my FM 2
>way equipment (220 mhz) that I did not have before. The new plugs are
>Champion RC12ECC (resistor suppressor) and the new ingition wiring is
>Mopar (Ignition suppressor wires) so I am puzzled. I never had any
>ignition noise issues with the OEM stuff for the first 50k miles, but
>now, even with portable equipment 10 feet away from the vehicle, I can
>hear fairly strong impulse noise.
>
>I checked all the wiring to assure that everything was seated
>correctly and nothing looks out of place.
>
>Does anyone know if the stuff they put in is more poorly suppressed
>than what was installed originally by Chrysler? Has anyone had better
>luck with different brands of plugs or wire sets? I'm just looking
>for a little input before I discuss the issue with my dealer.
>
>Thanks,
>
>Ender
>
>"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Just in case anyone else runs into this problem, I did finally find
the solution to the massive ignition noise problem on my 220 mhz radio
equipment.

After replacing the Champion plugs with Autolite Resistor plugs, and
the Mopar ignition wiring with Autolite Professional Suppression wires
and getting no improvement, I moved on to the distributor cap and
rotor.

It turned out to be the replacement distributor cap and rotor that my
dealer installed during my tune up. It had all aluminum fittings and
used a carbon button to transfer spark from the ignition coil to the
rotor inside the cap. While this caused absolutely no noise on the
AM/FM broadcast bands, it absolutely ripped up the vhf/uhf bands on my
ham gear with spark noise. There was nothing wrong with the
replacement cap and rotor, no cracks or loose hardware, and the engine
ran perfectly with these "noisy" tune up parts. I replaced the cap
and rotor installed by my 5 star dealer with "Standard" brand brass
fitted replacements (from Acme Auto) and the problem was instantly
resolved. The "quiet" distributor cap has the brass spring-loaded
button that makes contact with the rotor, which is also brass. It is
absolutely silent on the vhf/uhf bands.

Hope this helps anyone who runs into this issue.

Regards,

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Re: 99 Cherokee Sport 4.0 Liter Ignition Suppression Question
 

On Wed, 10 Dec 2003 19:56:05 -0500, Ender
<enderwiggin3rd@SBhotmail.com> wrote:

>Hi,
>
>My trusty '99 Cherokee Sport 4.0 liter just went in for a 50k checkup.
>The dealer put in a new set of plugs, a new distributor cap/rotor, and
>a new sparkplug wire set as part of the normal maintenance. The
>vehicle runs great, but I now have impulse ignition noise in my FM 2
>way equipment (220 mhz) that I did not have before. The new plugs are
>Champion RC12ECC (resistor suppressor) and the new ingition wiring is
>Mopar (Ignition suppressor wires) so I am puzzled. I never had any
>ignition noise issues with the OEM stuff for the first 50k miles, but
>now, even with portable equipment 10 feet away from the vehicle, I can
>hear fairly strong impulse noise.
>
>I checked all the wiring to assure that everything was seated
>correctly and nothing looks out of place.
>
>Does anyone know if the stuff they put in is more poorly suppressed
>than what was installed originally by Chrysler? Has anyone had better
>luck with different brands of plugs or wire sets? I'm just looking
>for a little input before I discuss the issue with my dealer.
>
>Thanks,
>
>Ender
>
>"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke

Just in case anyone else runs into this problem, I did finally find
the solution to the massive ignition noise problem on my 220 mhz radio
equipment.

After replacing the Champion plugs with Autolite Resistor plugs, and
the Mopar ignition wiring with Autolite Professional Suppression wires
and getting no improvement, I moved on to the distributor cap and
rotor.

It turned out to be the replacement distributor cap and rotor that my
dealer installed during my tune up. It had all aluminum fittings and
used a carbon button to transfer spark from the ignition coil to the
rotor inside the cap. While this caused absolutely no noise on the
AM/FM broadcast bands, it absolutely ripped up the vhf/uhf bands on my
ham gear with spark noise. There was nothing wrong with the
replacement cap and rotor, no cracks or loose hardware, and the engine
ran perfectly with these "noisy" tune up parts. I replaced the cap
and rotor installed by my 5 star dealer with "Standard" brand brass
fitted replacements (from Acme Auto) and the problem was instantly
resolved. The "quiet" distributor cap has the brass spring-loaded
button that makes contact with the rotor, which is also brass. It is
absolutely silent on the vhf/uhf bands.

Hope this helps anyone who runs into this issue.

Regards,

Ender

"The only thing necessary for the triumph of evil is for good men to do nothing." Edmund Burke