Car shaking after changing spark plugs

Scott Dorsey Wrote:
> In article <01c6caaa$fc162a80$a492c3d8@race>, * >
> wrote:
> >Shep > wrote in article
> >...
> >> Plat Bosch's in a 97 Lumina 3.1, replaced OE plats at 70k, at 22k
> Bosch's
> >
> >> began misfire under load, pulled em out the center electrode had
> eroded
> >> below the insulator, put oe's in another 70k no problem, field test
> >seemed
> >> to indicate they wouldn't work in this car.
> >
> >So, you're absolutely sure that it was the plug - not the ignition
> system's
> >inability to deal with the resistance of the Bosch Platinum plug???
>
> I have never used the Platinums, but I have been using the usual $2
> Bosch plugs for thirty years and never had a problem. They're a little
> more expensive than Autolite or NGK but they seem reliable.
> --scott
> --
> "C'est un Nagra. C'est suisse, et tres, tres precis."

It's the plats we're harping on...I have no issue with Bosch standard
plugs.


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* wrote:
>
> Mike Romain > wrote in article
> >...
>
> >
> > Don't know what is wrong with the suckers, but if you put them in a Jeep
> > 4.2 carb engine and in most Jeep 4.0 FI engines, they will work for a
> > few miles, then they carbon up and the engine starts running like crap,
> > especially at idle. Pull them out, put some real plugs in like Champion
> > and bingo, the engine runs well again.
> >
> > I have seen this well over a half dozen times in the last few years and
> > the fix is always to toss the plugs out.
> >
>
> These were the actual plugs recommended for the application by Bosch in the
> Bosch catalog?
>
> Or were the plug applications determined by cross-referencing from one plug
> manufacturer to Bosch?
>
> Carboned-up plugs suggest two things to me......
>
> Bad fuel system - which I would feel safe in eliminating since it would
> appear that other plugs did not carbon up in the same application.
>
> OR - wrong heat range for the plug....plugs running too cold for the engine
> application.
>
> Carboning up on a single plug MIGHT suggest one bad plug......
>
> .....but carboning up on ALL plugs suggests fuel system or parts
> application problems.

These plugs came out of the bosch book for the applications.

I mentioned two types of fuel systems and two types of ignition systems
with totally different coils.

The same complaint is posted a fair bit in the Jeep newsgroups. It is
common. Those engines just don't like those plugs or Bosch has no clue
in their North American books what plug a Jeep engine needs.....

Note all the others saying the same thing with other makes of engines.

Maybe Bosch has a defect they aren't aware of?

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Mike Romain Wrote:
> * wrote:
> >
> > Mike Romain > wrote in article
> > >...
> >
> > >
> > > Don't know what is wrong with the suckers, but if you put them in a
> Jeep
> > > 4.2 carb engine and in most Jeep 4.0 FI engines, they will work for
> a
> > > few miles, then they carbon up and the engine starts running like
> crap,
> > > especially at idle. Pull them out, put some real plugs in like
> Champion
> > > and bingo, the engine runs well again.
> > >
> > > I have seen this well over a half dozen times in the last few years
> and
> > > the fix is always to toss the plugs out.
> > >
> >
> > These were the actual plugs recommended for the application by Bosch
> in the
> > Bosch catalog?
> >
> > Or were the plug applications determined by cross-referencing from
> one plug
> > manufacturer to Bosch?
> >
> > Carboned-up plugs suggest two things to me......
> >
> > Bad fuel system - which I would feel safe in eliminating since it
> would
> > appear that other plugs did not carbon up in the same application.
> >
> > OR - wrong heat range for the plug....plugs running too cold for the
> engine
> > application.
> >
> > Carboning up on a single plug MIGHT suggest one bad plug......
> >
> > .....but carboning up on ALL plugs suggests fuel system or parts
> > application problems.
>
> These plugs came out of the bosch book for the applications.
>
> I mentioned two types of fuel systems and two types of ignition systems
> with totally different coils.
>
> The same complaint is posted a fair bit in the Jeep newsgroups. It is
> common. Those engines just don't like those plugs or Bosch has no clue
> in their North American books what plug a Jeep engine needs.....
>
> Note all the others saying the same thing with other makes of engines.
>
> Maybe Bosch has a defect they aren't aware of?
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
> Canadian Off Road Trips Photos: Non members can still view!
> Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
> (More Off Road album links at bottom of the view page)

I don't know...but the symptoms point to a very anemic, thin spark
production...not the fat flamethrowers that American high energy
ignition systems seem to like....after many issues with plugs in
different makes and models, I now always go with what is OEM, AC/Delco
in GM, Autolite or Motorcraft in Fords, Champion in Chrysler products,
Denso or NGK in Jap makes, Bosch in the Europeans that call for
them...saves a lotta hassle..

Some plugs are a proven winner for any app, i.e. I've put NGK's and
Denso's in just about anything at one point or another, with no ill
results....


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http://tinyurl.com/ftavm

Check the order of the wires off the distributor to the plugs. Then,
as most have said, if firing order okay, you likely looking at a bad
wire, bad connect at either the dist. or the plug.


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Knifeblade_03
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Wei Hu wrote:
> Hi,
>
> Today I replaced the six spark plugs of my 94 Ford Taurus.
> However, when I stop for red lights, the car shakes every one or two
> seconds.
> Does anybody know the reason?
> Could it be that I didn't adjust the gap?
>
> Thanks,
> Wei

Have a look inside the spark plug wire connectors, especially
the elbow ones. Make sure you haven't pulled the metal connector
back into the rubber shield when you pulled the connectors off.
I had that happen to my Pontiac. An easy way to check is to press
your thumb on the top of the connector when it's still attached
and see if you feel the top of the spark plug. Check the distributor
connections for the same thing.

Mike Romain > wrote in article
>...
> * wrote:
> >
> > Mike Romain > wrote in article
> > >...
> >
> > >
> > > Don't know what is wrong with the suckers, but if you put them in a
Jeep
> > > 4.2 carb engine and in most Jeep 4.0 FI engines, they will work for a
> > > few miles, then they carbon up and the engine starts running like
crap,
> > > especially at idle. Pull them out, put some real plugs in like
Champion
> > > and bingo, the engine runs well again.
> > >
> > > I have seen this well over a half dozen times in the last few years
and
> > > the fix is always to toss the plugs out.
> > >
> >
> > These were the actual plugs recommended for the application by Bosch in
the
> > Bosch catalog?
> >
> > Or were the plug applications determined by cross-referencing from one
plug
> > manufacturer to Bosch?
> >
> > Carboned-up plugs suggest two things to me......
> >
> > Bad fuel system - which I would feel safe in eliminating since it would
> > appear that other plugs did not carbon up in the same application.
> >
> > OR - wrong heat range for the plug....plugs running too cold for the
engine
> > application.
> >
> > Carboning up on a single plug MIGHT suggest one bad plug......
> >
> > .....but carboning up on ALL plugs suggests fuel system or parts
> > application problems.
>
> These plugs came out of the bosch book for the applications.
>
> I mentioned two types of fuel systems and two types of ignition systems
> with totally different coils.
>
> The same complaint is posted a fair bit in the Jeep newsgroups. It is
> common. Those engines just don't like those plugs or Bosch has no clue
> in their North American books what plug a Jeep engine needs.....
>
> Note all the others saying the same thing with other makes of engines.
>
> Maybe Bosch has a defect they aren't aware of?


Actually, my questions were leading up to the possibility of an incorrect
application listed in the catalog.

Black deposits on all plugs usually indicate a fuel system that is too rich
or a plug that is too cold.

* wrote:
>
> Mike Romain > wrote in article
> >...
> > * wrote:
> > >
> > > Mike Romain > wrote in article
> > > >...
> > >
> > > >
> > > > Don't know what is wrong with the suckers, but if you put them in a
> Jeep
> > > > 4.2 carb engine and in most Jeep 4.0 FI engines, they will work for a
> > > > few miles, then they carbon up and the engine starts running like
> crap,
> > > > especially at idle. Pull them out, put some real plugs in like
> Champion
> > > > and bingo, the engine runs well again.
> > > >
> > > > I have seen this well over a half dozen times in the last few years
> and
> > > > the fix is always to toss the plugs out.
> > > >
> > >
> > > These were the actual plugs recommended for the application by Bosch in
> the
> > > Bosch catalog?
> > >
> > > Or were the plug applications determined by cross-referencing from one
> plug
> > > manufacturer to Bosch?
> > >
> > > Carboned-up plugs suggest two things to me......
> > >
> > > Bad fuel system - which I would feel safe in eliminating since it would
> > > appear that other plugs did not carbon up in the same application.
> > >
> > > OR - wrong heat range for the plug....plugs running too cold for the
> engine
> > > application.
> > >
> > > Carboning up on a single plug MIGHT suggest one bad plug......
> > >
> > > .....but carboning up on ALL plugs suggests fuel system or parts
> > > application problems.
> >
> > These plugs came out of the bosch book for the applications.
> >
> > I mentioned two types of fuel systems and two types of ignition systems
> > with totally different coils.
> >
> > The same complaint is posted a fair bit in the Jeep newsgroups. It is
> > common. Those engines just don't like those plugs or Bosch has no clue
> > in their North American books what plug a Jeep engine needs.....
> >
> > Note all the others saying the same thing with other makes of engines.
> >
> > Maybe Bosch has a defect they aren't aware of?
>
> Actually, my questions were leading up to the possibility of an incorrect
> application listed in the catalog.
>
> Black deposits on all plugs usually indicate a fuel system that is too rich
> or a plug that is too cold.

It happens really fast on some of them and it has been going on for a
few years, since they came out I believe.

The book could just plain be wrong for a bunch or the systems are
designed for a fat spark like someone mentioned and they have a sharp
thin spark.

Meanwhile I get great results with Champion plugs in my CJ7's case
gapped a bit big to match an Accel SuperCoil's hotter output. I am
happy. Get good emissions and good mileage with punch when I need it.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's
Canadian Off Road Trips Photos: Non members can still view!
Jan/06 http://www.imagestation.com/album/pi...?id=2115147590
(More Off Road album links at bottom of the view page)

Wei Hu Wrote:
> Hi,
>
> Today I replaced the six spark plugs of my 94 Ford Taurus.
> However, when I stop for red lights, the car shakes every one or two
> seconds.
> Does anybody know the reason?
> Could it be that I didn't adjust the gap?
>
> Thanks,
> Wei

Hi Wei

According to NGK, you can use the following:

1994 FORD TAURUS LX / V6 / 3.0

SPARK PLUGS
Spark PlugPart No.Stock No.Plug GapNote
G-Power Platinum TR5GP 3186 0.044
Laser PTR5F-11 6579 0.044
Iridium IX TR5IX 7397 0.044

WIRE SETS
NotePart No.Stock No.OHV Eng.
RC-FDZ030 52164

OXYGEN SENSORS
Pre-Cat Left 22500
Pre-Cat Right 22500
Post-Cat Left N/R
Post-Cat Right N/R


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COULD BE: a plug wire could be on wrong cylinder (fire order off), you
have a small vacuum leak (perhaps this happened during the plug
change); others.

Hank


On Thu, 7 Sep 2006 12:03:05 -0700, clubplug
> wrote:

>
>Wei Hu Wrote:
>> Hi,
>>
>> Today I replaced the six spark plugs of my 94 Ford Taurus.
>> However, when I stop for red lights, the car shakes every one or two
>> seconds.
>> Does anybody know the reason?
>> Could it be that I didn't adjust the gap?
>>
>> Thanks,
>> Wei
>
>Hi Wei
>
>According to NGK, you can use the following:
>
>1994 FORD TAURUS LX / V6 / 3.0
>
>SPARK PLUGS
>Spark PlugPart No.Stock No.Plug GapNote
>G-Power Platinum TR5GP 3186 0.044
>Laser PTR5F-11 6579 0.044
>Iridium IX TR5IX 7397 0.044
>
>WIRE SETS
>NotePart No.Stock No.OHV Eng.
>RC-FDZ030 52164
>
>OXYGEN SENSORS
>Pre-Cat Left 22500
>Pre-Cat Right 22500
>Post-Cat Left N/R
>Post-Cat Right N/R