Longest you’ve seen someone go on a set of spark plugs

blupupher

Site Donor 2021
Messages
6,855
Location
Katy, Republic of Texas
My mom had ~140,000 miles on her Saturn Vue with the Ecotec, plugs looked just fine. I did replace them though.

Brother in law had 156,000 on his '04 F150 with the 5.4L 3v, and they were shot:
full-4879-1433-plug_2.png


Luckily got all 8 out with no broken plugs.
 
Messages
5,646
Location
the canyons
The most neglect I've seen was a T-100 with the 5VZ-FE. At 360k it had the original timing belt, and spark plugs. The FIPG sealing the water pump to the block was weeping, hence why it was in the shop.
 

doublebase

Thread starter
Messages
1,058
Location
Massachusetts
My mom had ~140,000 miles on her Saturn Vue with the Ecotec, plugs looked just fine. I did replace them though.

Brother in law had 156,000 on his '04 F150 with the 5.4L 3v, and they were shot:
full-4879-1433-plug_2.png


Luckily got all 8 out with no broken plugs.
You got all 8 plugs out of a 5.4 with 156,000 miles on it? Good for you sir! Job well done!

Those things are a nightmare.

And that plug had to be misfiring, right?
 
Messages
435
Location
KY, USA
As I said before I think 125K is about as long as I've ever left a set in. In the past spark plugs have been cheap enough I didn't worry about pushing them right up to the last mile they would run. This may change though with some plugs now running $10-20 each. I'd rather change them at my convenience than wait for them to start missing and have to do them right away. I recently changed the plugs in my '02 Ford Escort took less than 30 minutes and replaced them with some platinum plugs I'd bought for $1. each on clearance.
 

doublebase

Thread starter
Messages
1,058
Location
Massachusetts
As I said before I think 125K is about as long as I've ever left a set in. In the past spark plugs have been cheap enough I didn't worry about pushing them right up to the last mile they would run. This may change though with some plugs now running $10-20 each. I'd rather change them at my convenience than wait for them to start missing and have to do them right away. I recently changed the plugs in my '02 Ford Escort took less than 30 minutes and replaced them with some platinum plugs I'd bought for $1. each on clearance.
No I agree, and whenever I’ve owned a car/truck that was relatively easy to perform a plug replacement, I’d do it BEFORE it was required or suggested.

Things like four cylinder engines we have in the family, they’re a piece of cake to change. I’ve had a couple V8’s, that although time consuming, and more expensive, weren’t all that bad to do either (Think the last V8 I had the plugs were $10-$12 dollars a piece).

Now I have this V6 and it requires the intake coming off, gaskets to be replaced, lots of potential of things breaking...and for the first time ever, I may push it further out than I normally would.
 
Messages
435
Location
KY, USA
My Nissan is the same way, intake has to come off, vacuum hoses to remove, electrical connectors to unfasten, etc. Turned an otherwise 15-30 minute job into what I suspect will be a 1-2 hour job.
No I agree, and whenever I’ve owned a car/truck that was relatively easy to perform a plug replacement, I’d do it BEFORE it was required or suggested.

Things like four cylinder engines we have in the family, they’re a piece of cake to change. I’ve had a couple V8’s, that although time consuming, and more expensive, weren’t all that bad to do either (Think the last V8 I had the plugs were $10-$12 dollars a piece).

Now I have this V6 and it requires the intake coming off, gaskets to be replaced, lots of potential of things breaking...and for the first time ever, I may push it further out than I normally would.
 
Messages
10,039
Location
OH
I've gone over 100K on a set of non-iridium plugs on my Corolla, but I usually try to change them out every 75K or so...
 

wdn

Messages
1,641
Location
NH
I have 72,000 miles on the copper plugs on my Gen 1 Tundra with 162,000 miles on it. I bought a new set of the OE (Denso) plugs from the dealership, and will change them in the spring. The truck has only used Toyota plugs.
 
Messages
261
Location
ga
213K '03 Honda Element. I had bought a new set of NGK at around 160K but wound up giving them to the guy I sold it to. It was running perfect and gas milage never changed.
 
Messages
1,509
Location
US
A few years back, a coworker bought a used Odyssey minivan with over 200K on the clock. He changed the plugs, and as best as we could tell they were original/factory plugs.

We spent some time looking at them under a microscope, and they were an interesting sight. A significant amount of the ground electrode had eroded, but running down it and in nearly perfect shape you could see a platinum wire. The gap between the Pt wire and the tip was actually not terribly far out of spec.
 
Messages
24
Location
Northern va
I worked with a guy who had a 03 F250 with a 5.4, went just over 300k miles on the original single platinum plugs. There was literally no electrode left. Wish I had taken pics. I honestly don’t even know how it ran. Started running rough one day and he finally put plugs in it.
 
Messages
706
Location
Indiana
I have a friend with a 400k+ honda civic. The original set of plugs were pulled and inspected around 100k and put back in because they looked great. I think they were were changed around 220k miles or thereabouts. They still looked ok when they were replaced.
 
Messages
5,736
Location
North Texas
On my Tacoma they recommend 30K intervals on copper plugs (denso/Ngk). My first plug change I went 60K. I change them every 30K now. It’s a good time to clean the throttle body and do preventive maintenance.
 
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