i recently changed the plugs in the 86 and 84 and i used the copper core autolights. the gas milage has drop dramatic went from 20 mpgs in the 86 to 17 and the 84 got about 17 and is now 15 to 16 mpgs. we both drive just to work and the same route for years now. the plugs i put in last time where the boush platniums. is this possible that my 5.0s dont like autolights and if so what plug do your guys 5.0s like. thanks matt
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1984 mercury grand marquis ls rebuilt 306 flat top pistons with factory cfi and lincoln headers with single glasspack dual snorkle air cleaner. Gloss black paint with slick top coversion.
1986 mercury grand marquis colony park 5.0 sefi dual exhuast thrush turbos with h pipe and turbines -
I'd say something else changed, or you have bad plugs (individually). Copper autolites are the go-to here.
85 4 door 351 Civi Crown Victoria - Summer daily driver, sleeper in the making, and wildly inappropriate autocross machine
160KMs 600cfm holley, shorty headers, 2.5" catted exhaust, 255/295 tires, cop shocks, cop swaybars, underdrive pulley, 2.73L gears.
waiting for install: 3.27's, Poly bushings, boxed rear arms, 2500 stall converter, ported e7's, etc
06 Mazda 3 hatch 2.3L 5AT (winter beater that cost more than my summer car) -
I've never had any luck with autolites personally. I think they are getting junky. I use NGK whenever possible.
'90 LX 5.0 mustang
Big plansComment
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ive always used motorcraft for fords but my parst store didnt have them at the time. however they do still have ac delco r45ts. i know those are awsome plugs in a chevy but never used them in a ford. i do have a set of old champions in there original boxes that i never used that was for another project. its not pressure as i check the tires daily and the ecus anrnt throughing any codes eiather. the 86 with sefi always got good milage around 20 to 22. the 84 with the cfi has always no matter what been at 17. yesterday i installed the lincoln logs headers on the 84 so we will see if that helps any. i noticed the lincoln headers added more depth in exhuast tone and little more grunt on the bottom end. also i noticed that the cats on the 86 where looking pretty bad. even the pre cats. i dont have emissions for these cars and wont in the for seeable future eaither. would it be a good idea be to take the cats out?1984 mercury grand marquis ls rebuilt 306 flat top pistons with factory cfi and lincoln headers with single glasspack dual snorkle air cleaner. Gloss black paint with slick top coversion.
1986 mercury grand marquis colony park 5.0 sefi dual exhuast thrush turbos with h pipe and turbinesComment
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I use the AC Delco R44NTSE in my Ford. (Which is whats called for in the ford). Been using them for years.
Alex.Comment
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I use motorcrafts.
1. because there recommended
2. because there cheaper at my local auto parts store than autolites or NGK'sComment
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autolite plugs
When I changed the plugs in my '81 ltd, I put in autolite platums in. Never had and trouble over the years with these plugs. The plugs I took out were motorcraft,and judging how they looked, were the originals from '81Comment
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Used to use regular Autolites till I got a bad batch. This was just after they moved production to China. I had random misfires and it sucked more fuel than normal. Since then its been Motorcraft. They are Hecho en Mexico.86 Lincoln Town Car (Galactica).
5.0 HO, CompCams XE258,Scorpion 1.72 roller rockers, 3.55 K code rear, tow package, BHPerformance ported E7 heads, Tmoss Explorer intake, 65mm throttle body, Hedman 1 5/8" headers, 2.5" dual exhaust, ASP underdrive pulley
91 Lincoln Mark VII LSC grandpa spec white and cranberry
1984 Lincoln Continental TurboDiesel - rolls coal
Originally posted by phayzer5
I drive a Lincoln. I can't be bothered to shift like the peasants and rabble rousersComment
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I switched to E3's on my 351W to see if they lived up to all the advertising....in my experience they are worth every penny. I used to run autolites before production moved to China...we've noticed all sorts of comebacks at work due to the use of autolites....car runs fine after plugs and halfway back to the shop it'll develop a misfire, replaced plugs and it's fine...we even had an Acura 3.2 that would put up misfire codes but you could never feel 'em...that car just wasn't happy until we put NGK's in it.
If you can't justify the $20-25 for 8 Diamondfire E3's, then I would definitely suggest motorcraft.
Good luck,
Don'85 CV coupe- 351W, T5-Z, FAST Ez-Efi, shorty headers, 2.5" duals with knock off flowmasters, 2.5" Impala tails, seriously worked GT-40 irons, Comp 265DEH cam, 1.7rr's, Mallory HyFire 6A, Taylor ThunderVolt 50 10.4mm wires, 75mm t/b, 3G alt swap, 140mph PI speedo, PI rear sway bar, '00 PI booster/MC, 95-97 front spindles, '99 front hub bearings/brakes, '92-'94 front upper control arms/ball-joints, 3.73's with rebuilt traction-lok, '09 PI rear disc swap, '96 Mustang GT wheels with 235/55R17's.Comment
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I've only ever used Motorcraft plugs, no problems at all. Don't remember the part number.sigpic
- 1990 Ford LTD Crown Victoria P72 - the street boat - 5.0 liter EFI - Ported HO intake/TB, 90 TC shroud/overflow, Aero airbox/zip tube, Cobra camshaft, 19lb injectors, dual exhaust w/ Magnaflows, Cat/Smog & AC delete, 3G alternator, MOOG chassis parts & KYB cop shocks, 215/70r/15s on 95-97 Merc rims
- 2007 Ford Escape XLT - soccer mom lifted station wagon - 3.0 Duratec, auto, rear converter delete w/ Magnaflow dual exhaust
- 2008 Mercury Grand Marquis Ultimate Edition - Daily driver - 4.6 2 valve Mod motor, 4R75E, 2.73s. Bone stockComment
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i run bosch platinums....work good...last a long time...use lots of em....i do suggest a god HOT coil if using platinum plugs however....msd streetfire works great...and a GOOD set of wires...(i like ford racing 8.8mm...in red..matches the msd coil and cap....lol)Comment
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Got the Bosch Plats in my '87 along with OEM Cap, Rotor and Wires. The '95 has Motorcraft plugs along with OEM wires. No problems!
"Hope and dignity are two things NO ONE can take away from you - you have to relinquish them on your own" Miamibob
"NEVER trade your passion for glory"!! Sal "the Bard" (Dear Old Dad!)
"Cars are for driving - PERIOD! I DON'T TEXT, TWEET OR TWERK!!!!"Comment
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Did anybody hear anything plats running hotter than coppers plugs and causing issues???"To Find yourself, you must first lose yourself"
-1973 Volkswagen Bus Westy
-1986 Honda Magna 700cc
-1989 Lincoln Town car Signature Series
-2011 Subaru OutbackComment
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I've always used Bosch iridiums or platinums and no problems. However I put Motorcraft in my lincoln and they are fine as well. Only had bad experiences with auto lite, champion sucks too.
Next time I put plugs in my 85 I'm getting E3's.1985 LTD Crown Victoria - Currently restoring after she caught fire! CFI to SEFI to Carb swap, all custom wiring, Duraspark 2 ignition, Motorcraft 2100 Carb, slicktop, Shorty headers dumped before rear axle, 140 Speedo, 3G alt, And currently building an engine for her.
2000 Lincoln Town Car Signature Series - 165XXX, PI intake swap
, 30 MPG Easy on the Highway
, All options except dual exhaust. Currently looking for 2 front seats: Heated, Memory, and Light Graphite color!!Comment
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Thanks for the input, I had bad luck with the bosch platinum 4's
I was gonna ge this:
and this
(even through the bosch platinums are half the price!)
What do you guys think, Am i oging down a bad path here?"To Find yourself, you must first lose yourself"
-1973 Volkswagen Bus Westy
-1986 Honda Magna 700cc
-1989 Lincoln Town car Signature Series
-2011 Subaru OutbackComment
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