Re: Replacing spark plugs
 

Looks like it, the Mopar part number is
Mopar SP000ZFR5N Resistor Copper Plug

The only mention I can find of platinums is for the HO 4.7

Ask your mechanic if he has a smog license and wants to keep it.
Some states are more hostile than others regarding smog scams.


billy ray proclaimed:

> That engine came from the factory with copper Champions as your 'mechanic'
> well knows.
>
> If you have had no drivability problems with the Platinums (I haven't in 3
> Jeeps) you can continue with them but be advised Bosch Platinums RETAIL for
> less than $2.50 each.
>
>
>
> "tinman" <tintinrao@gmail.com> wrote in message
> news:1175811236.341976.127850@d57g2000hsg.googlegr oups.com...
>
>>Hi,
>>
>>I have my '99GC 4.0L 6cyl in the shop for a 90K maintenance. The
>>mechanic
>>just called me and says that he found platinum plugs in there and so
>>he must
>>replace them with platinum plugs. He insists that he cannot replace
>>platinum
>>plugs with regular plugs (which are included in the maintenace charge)
>>and
>>wants to charge me $12 extra per plug. Is this true? I do not intend
>>to keep
>>the car long enough to justify the benefit of platinum plugs, so I'm
>>inclined
>>to go with regular plugs. Is there any downside to this or am I just
>>getting
>>scammed?
>>
>>thanks.
>>
>>-Tin
>>
>
>
>

Re: Replacing spark plugs
 

Looks like it, the Mopar part number is
Mopar SP000ZFR5N Resistor Copper Plug

The only mention I can find of platinums is for the HO 4.7

Ask your mechanic if he has a smog license and wants to keep it.
Some states are more hostile than others regarding smog scams.


billy ray proclaimed:

> That engine came from the factory with copper Champions as your 'mechanic'
> well knows.
>
> If you have had no drivability problems with the Platinums (I haven't in 3
> Jeeps) you can continue with them but be advised Bosch Platinums RETAIL for
> less than $2.50 each.
>
>
>
> "tinman" <tintinrao@gmail.com> wrote in message
> news:1175811236.341976.127850@d57g2000hsg.googlegr oups.com...
>
>>Hi,
>>
>>I have my '99GC 4.0L 6cyl in the shop for a 90K maintenance. The
>>mechanic
>>just called me and says that he found platinum plugs in there and so
>>he must
>>replace them with platinum plugs. He insists that he cannot replace
>>platinum
>>plugs with regular plugs (which are included in the maintenace charge)
>>and
>>wants to charge me $12 extra per plug. Is this true? I do not intend
>>to keep
>>the car long enough to justify the benefit of platinum plugs, so I'm
>>inclined
>>to go with regular plugs. Is there any downside to this or am I just
>>getting
>>scammed?
>>
>>thanks.
>>
>>-Tin
>>
>
>
>

Re: Replacing spark plugs
 

I would wonder if your GAP was off.
Someone can correct me...but when your GAP is too big, if you draw the
curve of how much current is at the plug when it sparks, you'll see
that this takes longer to achieve then when it's GAP'd properly.
So, you lose some power.
Putting in different "types" of plugs with different metal contacts
probably means your timing will change too (this is on the matter of
milliseconds though!
The different materials are to reduce oxidation from the sparking and
to allow for hotter applications (more current).

If you go with hotter plugs, you might want to upgrade your plug wires
too (drawing more current, wires heat up some).

Anyhow, just replaced mine with OEM plugs and runs great! If you
change plugs and things run better...odds are the gap was off or the
plugs were dirty!
I hadn't changed plugs until 100,000km and the GAP was HUGE (twice the
suggest gap of 35thou).

Plugs cost me $20canadian.

cheers

On Apr 5, 8:50 pm, "Jeff Strickland" <c...@verizon.net> wrote:
> "tinman" <tintin...@gmail.com> wrote in message
>
> news:1175811236.341976.127850@d57g2000hsg.googlegr oups.com...
> > I have my '99GC 4.0L 6cyl in the shop for a 90K maintenance. The
> > mechanic
> > just called me and says that he found platinum plugs in there and so
> > he must
> > replace them with platinum plugs. He insists that he cannot replace
> > platinum
> > plugs with regular plugs (which are included in the maintenace charge)
> > and
> > wants to charge me $12 extra per plug. Is this true? I do not intend
> > to keep
> > the car long enough to justify the benefit of platinum plugs, so I'm
> > inclined
> > to go with regular plugs. Is there any downside to this or am I just
> > getting
> > scammed?
>
> > thanks.
>
> > -Tin
>
> It may or may not be a load of crap. It doesn't matter what he found, it
> only matters what the design calls for. I don't know what they designed for
> that motor, but my 258 (4.2L, sotrta) just takes standard plugs. I can't
> imagine your 4.0L requires platinum plugs, I suspect a previous owner put
> them in, or if you are the previous onwer then a shop installed them for you
> for any number of reasons.
>
> What I can say with certainty is that if you need high performance plugs,
> and you get standard plugs, the motor won't run worth a ----.
>
> I once owned a brand spanking new GM car with a High Output (quotes needed
> there) 2.8L V6 that -- I swear to God -- could not get out of its own way.
> Well, by and by I decided to replace the spark plugs because it was time. I
> went to the corner store and they looked up in the catalog, and came back
> with the "right" plugs. I installed them, and went for a test drive on the
> main drag in my town. Not only couldn't I get out of my own way, I became
> serious problem to the general population also using the main drag. I got
> back to my driveway, and checked EVERYTHING. Yes, everything. I had to take
> the car to the local tune up shop, and the guy pulled a plug and reported,
> "here's your trouble." It turns out the plug requirement was for some
> Hot-Snot Copper Core something or other, but all I had was regular snot. I
> took the regular snot and the mechanic's bill to the auto parts store, but
> all I got back was the cost for the crappy plugs.
>
> The moral of the story is, you might need hot-snot spark plugs, in which
> case you should get them. I think you can use the regular snot plugs though,
> and save several dollars.

Re: Replacing spark plugs
 

I would wonder if your GAP was off.
Someone can correct me...but when your GAP is too big, if you draw the
curve of how much current is at the plug when it sparks, you'll see
that this takes longer to achieve then when it's GAP'd properly.
So, you lose some power.
Putting in different "types" of plugs with different metal contacts
probably means your timing will change too (this is on the matter of
milliseconds though!
The different materials are to reduce oxidation from the sparking and
to allow for hotter applications (more current).

If you go with hotter plugs, you might want to upgrade your plug wires
too (drawing more current, wires heat up some).

Anyhow, just replaced mine with OEM plugs and runs great! If you
change plugs and things run better...odds are the gap was off or the
plugs were dirty!
I hadn't changed plugs until 100,000km and the GAP was HUGE (twice the
suggest gap of 35thou).

Plugs cost me $20canadian.

cheers

On Apr 5, 8:50 pm, "Jeff Strickland" <c...@verizon.net> wrote:
> "tinman" <tintin...@gmail.com> wrote in message
>
> news:1175811236.341976.127850@d57g2000hsg.googlegr oups.com...
> > I have my '99GC 4.0L 6cyl in the shop for a 90K maintenance. The
> > mechanic
> > just called me and says that he found platinum plugs in there and so
> > he must
> > replace them with platinum plugs. He insists that he cannot replace
> > platinum
> > plugs with regular plugs (which are included in the maintenace charge)
> > and
> > wants to charge me $12 extra per plug. Is this true? I do not intend
> > to keep
> > the car long enough to justify the benefit of platinum plugs, so I'm
> > inclined
> > to go with regular plugs. Is there any downside to this or am I just
> > getting
> > scammed?
>
> > thanks.
>
> > -Tin
>
> It may or may not be a load of crap. It doesn't matter what he found, it
> only matters what the design calls for. I don't know what they designed for
> that motor, but my 258 (4.2L, sotrta) just takes standard plugs. I can't
> imagine your 4.0L requires platinum plugs, I suspect a previous owner put
> them in, or if you are the previous onwer then a shop installed them for you
> for any number of reasons.
>
> What I can say with certainty is that if you need high performance plugs,
> and you get standard plugs, the motor won't run worth a ----.
>
> I once owned a brand spanking new GM car with a High Output (quotes needed
> there) 2.8L V6 that -- I swear to God -- could not get out of its own way.
> Well, by and by I decided to replace the spark plugs because it was time. I
> went to the corner store and they looked up in the catalog, and came back
> with the "right" plugs. I installed them, and went for a test drive on the
> main drag in my town. Not only couldn't I get out of my own way, I became
> serious problem to the general population also using the main drag. I got
> back to my driveway, and checked EVERYTHING. Yes, everything. I had to take
> the car to the local tune up shop, and the guy pulled a plug and reported,
> "here's your trouble." It turns out the plug requirement was for some
> Hot-Snot Copper Core something or other, but all I had was regular snot. I
> took the regular snot and the mechanic's bill to the auto parts store, but
> all I got back was the cost for the crappy plugs.
>
> The moral of the story is, you might need hot-snot spark plugs, in which
> case you should get them. I think you can use the regular snot plugs though,
> and save several dollars.

Re: Replacing spark plugs
 

I would wonder if your GAP was off.
Someone can correct me...but when your GAP is too big, if you draw the
curve of how much current is at the plug when it sparks, you'll see
that this takes longer to achieve then when it's GAP'd properly.
So, you lose some power.
Putting in different "types" of plugs with different metal contacts
probably means your timing will change too (this is on the matter of
milliseconds though!
The different materials are to reduce oxidation from the sparking and
to allow for hotter applications (more current).

If you go with hotter plugs, you might want to upgrade your plug wires
too (drawing more current, wires heat up some).

Anyhow, just replaced mine with OEM plugs and runs great! If you
change plugs and things run better...odds are the gap was off or the
plugs were dirty!
I hadn't changed plugs until 100,000km and the GAP was HUGE (twice the
suggest gap of 35thou).

Plugs cost me $20canadian.

cheers

On Apr 5, 8:50 pm, "Jeff Strickland" <c...@verizon.net> wrote:
> "tinman" <tintin...@gmail.com> wrote in message
>
> news:1175811236.341976.127850@d57g2000hsg.googlegr oups.com...
> > I have my '99GC 4.0L 6cyl in the shop for a 90K maintenance. The
> > mechanic
> > just called me and says that he found platinum plugs in there and so
> > he must
> > replace them with platinum plugs. He insists that he cannot replace
> > platinum
> > plugs with regular plugs (which are included in the maintenace charge)
> > and
> > wants to charge me $12 extra per plug. Is this true? I do not intend
> > to keep
> > the car long enough to justify the benefit of platinum plugs, so I'm
> > inclined
> > to go with regular plugs. Is there any downside to this or am I just
> > getting
> > scammed?
>
> > thanks.
>
> > -Tin
>
> It may or may not be a load of crap. It doesn't matter what he found, it
> only matters what the design calls for. I don't know what they designed for
> that motor, but my 258 (4.2L, sotrta) just takes standard plugs. I can't
> imagine your 4.0L requires platinum plugs, I suspect a previous owner put
> them in, or if you are the previous onwer then a shop installed them for you
> for any number of reasons.
>
> What I can say with certainty is that if you need high performance plugs,
> and you get standard plugs, the motor won't run worth a ----.
>
> I once owned a brand spanking new GM car with a High Output (quotes needed
> there) 2.8L V6 that -- I swear to God -- could not get out of its own way.
> Well, by and by I decided to replace the spark plugs because it was time. I
> went to the corner store and they looked up in the catalog, and came back
> with the "right" plugs. I installed them, and went for a test drive on the
> main drag in my town. Not only couldn't I get out of my own way, I became
> serious problem to the general population also using the main drag. I got
> back to my driveway, and checked EVERYTHING. Yes, everything. I had to take
> the car to the local tune up shop, and the guy pulled a plug and reported,
> "here's your trouble." It turns out the plug requirement was for some
> Hot-Snot Copper Core something or other, but all I had was regular snot. I
> took the regular snot and the mechanic's bill to the auto parts store, but
> all I got back was the cost for the crappy plugs.
>
> The moral of the story is, you might need hot-snot spark plugs, in which
> case you should get them. I think you can use the regular snot plugs though,
> and save several dollars.