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Autolite plug rebate

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Posted by: ponytail john

Just got back from Wal*Mart where I bought eight Autolite sparkplugs for the Mark. On the package of two there's a $2.00 rebate so eight will get you back $8.00. You're allowed up to $16.00. So if anyone needs Autolite plugs, now is the time so basically the 764's will be a little over a buck for two or the platinums will be a buck a piece after the rebate

Posted by: ponytail john

My math isn't too good on this Sunday morning, the copper plugs would be like almost free after the rebate.

Posted by: MatthewDavid

Are Autolite any good?... I was gonna go with Motorcraft... but I'm not sure... sounds like a fancy deal!

Posted by: Moes8

Quote:

Originally Posted by MatthewDavid

Are Autolite any good?... I was gonna go with Motorcraft... but I'm not sure... sounds like a fancy deal!

most people on here say the autolite 764's are the ONLY plugs to use in these cars

Posted by: 98LSC32V

NGK TR55's are just as good if not a bit better in my opinion.

Posted by: unity

Copper is the best conductor. ANYTHING ELSE will produce less spark. Plain and simple 6th grade physics. The only advantage to anything else is plug life, nothing else - unless you like to be brain washed by marketers.

Posted by: MonsterMark

The 764's are a good plug at a good price. Only problem with them is electrode life. Expect 20,000 - 25,000 miles before the gap gets too big. If you gap them at .050, they'll be almost .060 in 20,000 miles. The 765's (platinum version) will get you more serviceable miles out of each plug change. With how easy it is to change plugs on these motors, the choice is yours.

Personally, I bought 16 plugs about 2 months ago (765's) when the rebate came out.

FYI, and IMHO, so take it for what it's worth. My 2 cents!

Posted by: dRock95MarkVIII

Quote:

Originally Posted by MatthewDavid

Are Autolite any good?... I was gonna go with Motorcraft... but I'm not sure... sounds like a fancy deal!

Autolite is the OEM for Motorcraft spark plugs. I like to use Motorcraft for the name, though

IMO, I'd run at least a single plat plug. Double plat (motorcraft or autolite) even better. Though platinum does not conduct as well as copper, as unity mentioned, it will last a heck of a lot longer. Besides that, the marginal improvement in spark with a copper plug would not be noticed at all in our cars.

-96 Marks w/ waste-spark type EDIS really should use double plats. The gaps will erode faster on these than the 97-98 w/ COPs. Using a double plat will extend the service interval dramatically over copper - do you really feel like squeezing in there to change those plugs every 20k?

Running a double plat, you could easily run WELL past 75k miles on the plugs assuming 'normal' usage (w/ no misfires or odd engine conditions of course)

Remember to torque your plugs to factory spec!

Posted by: unity

Quote:

Originally Posted by dRock95MarkVIII

-96 Marks w/ waste-spark type EDIS really should use double plats. The gaps will erode faster on these than the 97-98 w/ COPs. Using a double plat will extend the service interval dramatically over copper - do you really feel like squeezing in there to change those plugs every 20k?

Running a double plat, you could easily run WELL past 75k miles on the plugs assuming 'normal' usage (w/ no misfires or odd engine conditions of course)

I agree on all you points. And to add that these are aluminum blocks so more changes means more potential wear on the threads of the heads.

But I need to correct you on one point. All Marks use the "wasted spark" system. Even the 97/98s. The COPS are wired in series, so just like all other Marks two spark plugs are fired at once. The coil packs contain the 4 coils per pack with two "wired" as pairs. All the 97/98 COP system introduced was splitting up the coils and locating up on top the spark plugs. In the end, both systems have 4 "trigger" wires to control the system.

Posted by: dRock95MarkVIII

Quote:

Originally Posted by unity

The 97-98 Mark VIIIs w/ COP used individual ground triggers for each COP from the PCM for individual cylinder spark control:

(click fullsize)

(Note that they share a common, fused power source. But the ground is triggered separately by the PCM for each COP.)

This is what allowed the engine torque modulation feature to be added to the traction control, just like they did in 1998 for panther platform cars when they went to COP. With individual cylinder coils, spark output could be controlled at individual cylinders to limit power (as well as fuel injector output)

They are not in series. If they were, you would not be able to get a single cylinder misfire code from a failed COP - as if one failed the other in series would also be disabled. If the COPs were to be wired using a 4 wire trigger system (ie retrofitting COPs using a stock -96 EDIS system) you would want them in parallel that way if one fails the other cylinder using the same ground trigger would not also be disabled.

An additional excerpt from the 97 FSM comparing the coil pack EDIS waste-spark system to the new COP system:

Quote:

Coil Pack

A coil in a coil pack (Figure 55) is turned on (i.e. coil charging) by the PCM, then turned off firing two spark plugs at once. The spark plugs are paired so that as one spark plug fires on the compression stroke, the other spark plug fires on the exhaust stroke. The next time the coil is fired the order is reversed. The next pair of spark plugs fire according to the engine firing order.

The Coil On Plug (Figure 56) works in the same manner as a standard coil pack. Since each cylinder has its own coil, only one spark plug is fired at a time and only on the compression stroke.

Posted by: Moes8

you have convinced me.

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