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OT, 186,000 miles, is it time for new plugs?
Posted by: moomba32 ()
Date: February 23, 2018 08:30AM

I was wondering, the jeep liberty just turned over 186,000 and still has factory plugs, actually runs good and gas mileage is a bit better than it was when it was younger. What you think?

Don Marlowe
66 Monza 2Dr 140/pg
64 Spyder convertible now, 110/pg
Eutawville SC

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: cnicol ()
Date: February 23, 2018 08:34AM

The plugs are firing but it's almost certain the spark plug gaps are much larger than spec. Larger gaps stress the high-voltage system, leading to spark coil or conductor failures. If you change the plugs before HV failure you preclude that problem. 100k is a good time for that PM.

Craig N. Coeur d'Alene ID.
66 Black Monza 4dr, 4.2L V8 49k
61 Seamist Jade Rampside 140 PG
60 Monza coupe (sold, sniff sniff)
66 Sprint Corsa convt - First car! Re-purchased 43 years later
2+2 gnatsuM 5691

+17 Tons of parts

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: irfgt ()
Date: February 23, 2018 08:55AM

Depends on the type and brand of plugs. Some iridium plugs will last the life of the vehicle.

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: azdave ()
Date: February 23, 2018 09:10AM

Just hope they don't cross-thread or break off when you change them if they've been in that long. You'll be kicking yourself for messing with something that was working fine if they get buggered up. sad smiley


Dave W. / Gilbert Arizona
66 Corsa 140 4-speed w/factory A/C
66 Corsa 140 4-speed
65 Corsa 140 4-speed
66 Corsa 455 Toro V8
65 Monza 455 Toro V8
65 Monza 110 Convertible
65 Monza 4DR 140 PG w/factory A/C
65 Monza 4DR EJ20T w/5-speed




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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: jjohnsonjo ()
Date: February 23, 2018 10:40AM

I have the long life plugs in my motorhome. Once the coating burns off they will deteriorate quickly and you will have a miss. I have to replace them on the road. The problem is as mentioned, when they are in there that long they can get stuck. You didn't mention how old the liberty is, but its a combination of age and miles.

J.O.

65 Corsa Turbo Vert
79 Honda XL 500S
69 Honda CL 160 D
2010 BMW F 650 GS
2003 Bounder 36D
2013 KIA Optima SX turbo-AKA ZIPPY (wife,s car)
69 Newport Holiday Sailboat
Baja 150 dune buggy cart
Coleman HS 500 UTV
2016 KIA Sorento SXL Turbo

Bethlehem,Pa

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: 66Monza140 ()
Date: February 23, 2018 01:23PM

I recently changed the OEM plugs in my 2004 Dakota 3.9L. (Bought it used). Had to replace a rocker arm that snuck out from underneath the camshaft due to a sticky follower in -10 weather. Plugs were still firing, but the gap was over 90K! Mileage went up, and runs smoother. I'd do it, or at least pull one out and see where you're at..

"Give'r hell 'til you see God, then back'er down a notch"

'66 Monza 140 4 sp w/A/C...
Western VT

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: moomba32 ()
Date: February 23, 2018 02:52PM

I will change them if an opportunity comes up, I haven't run out of something to do in 40 years, jobs tend to get done when they work their way up on the list, stuff that's not causing problems has a hard time climbing that list. I have a 2002 Tahoe that has 140,000 miles, it has new plugs on one side because I had to change the air conditioner compressor so swapped plugs while I was there, still have four more waiting for the other side.
I fully understand the voltage issue, compelling argument.

Don Marlowe
66 Monza 2Dr 140/pg
64 Spyder convertible now, 110/pg
Eutawville SC

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: VairKing ()
Date: February 23, 2018 05:06PM

I recently had a misfire on my recently purchased 2005 2500 Suburban 8.1 L. 180,000 miles. Rough idle, fine at cruise and under load. Thought maybe a coil was on the way out. Spark plugs were original. Had a heck of a time getting them out, luckily they all eventually came out in one piece. The electrodes were almost gone! It's hard to believe it would even run! New plugs and it runs like new. I thought I took a picture bug of course can't find it. Change them! Nobody does preventive maintenance any more.

_________________________________________
Ryan Counterman (Moderator)
1965 Corsa Kelmark V8 400 HP ///1965 Monza Sedan 110/PG /// Ultimate Corvair Hauler/// Don Eichstaedt's 1965 Corsa Racecar
West Michigan Corvair Club /// New Build! 1966 Corsa GTP Convertible Mid Engine 3.8L Supercharged!

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: joelsplace ()
Date: February 23, 2018 05:55PM

I would pull one out and look at it. I've seen some factory plugs that still looked almost new at over 120K and the gaps were fine.

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: isucorvair ()
Date: February 23, 2018 06:52PM

Factory plugs on my 2012 Flex with 165k, and 2011 Jetta, with 152k.... Both run like a Swiss watch.
I sold my 05 Passat with 197k, and factory plugs.



Eric P
DeWitt, IA

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: krfjkm ()
Date: February 23, 2018 08:04PM

How do you like your Liberty? Buying one for my daughter--- anything I should know or check?

KRFJKM
Charlotte NC
1965 Corvair Corsa

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Re: OT, 186,000 miles, is it time for new plugs?
Posted by: moomba32 ()
Date: February 24, 2018 05:12AM

krfjkm Wrote:
-------------------------------------------------------
> How do you like your Liberty? Buying one for my
> daughter--- anything I should know or check?

Mine is 2004, 2wd, it was my wife's until she spun on the interstate and didn't want to drive it anymore. It drives fine on dry roads, it's so short and light that it's a hand full when it's rainy heavily. Mechanically it has done excellent, I give it very little maintenance, and it's closing in on 200,000, gets about 22mpg. The lower ball joints don't have grease fittings, they'll start creaking, that's a sign that they need to be replaced, I had one pop out and it broke the wheel off but they are cheap and easy to change. Other than a few sensors and calipers it's needed nothing and always cranks and goes.

Don Marlowe
66 Monza 2Dr 140/pg
64 Spyder convertible now, 110/pg
Eutawville SC

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