How long should Plugs/Wires last?? - Mercedes-Benz Forum
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post #1 of 15 (permalink) Old 05-07-2019, 07:06 AM Thread Starter
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How long should Plugs/Wires last??

Hey all,

Still researching my slightly rough idle.

Seems that plugs and wires fix this across the boards, but I replaced them right off the bat when I bought the truck about 4 years ago. I used OEM-equivalent parts, no fleabay junk here. Pretty sure BERU wires and BOSCH plugs.

Ive probably got 50K miles on the plugs and wires. What kind of longevity should I expect from them? It seems premature that I need new plugs and wires already!

Or should I move on to the coils themselves, which have never been changed? Thats obviously the more costly item, but traditionally I never mess with coils until they fail because of ease of R&R. They also don't seem to degrade, rather just work or they dont.

What do you guys think?

https://www.fcpeuro.com/products/mer...-m113tunekitv8

https://www.fcpeuro.com/products/mer...il-bosch-00107
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post #2 of 15 (permalink) Old 05-07-2019, 09:36 AM
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How many miles are on that engine? As an engine wears, uneven compression between cylinders and slight misfires eventually roughens the idle.
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post #3 of 15 (permalink) Old 05-07-2019, 11:53 AM
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look for a vacuum leak
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post #4 of 15 (permalink) Old 05-07-2019, 12:17 PM
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Question

Jetpilot:

Good questions !

I'd guess 100k for plugs; wires that or maybe more.

But if plugs over 100k, it's not to much to thrown new wires on 'just in case', right ?

I'm personally, avoiding the plug job as my M113 V-8 runs great so far.

If mpg tanks, or big misfire happens, I'll pull them.

Basically, rig was perfectly clean when I got it at 102k and 3 years ago, and I am going on the assumption plugs were done by the $$$ prior owner.

But at 150k now, I do wonder. Just have a busy life and yanking 16 plugs sounds both unnecessary & distracting.

My idle is slightly lumpy, not bad, and combined with my loud performance exhaust, sounds a bit menacing.

Every once in a while a Charger or Mustang or Vette wants to race. So, there are upsides to a lumpy idle, LOL !

But I digress, amen to checking for a vacuum leak. I'm sure those who know more can give direction.

I know there are molded vacuum hoses that are on top of engine - the ones that must remove if doing valve cover gaskets - are those the ones that are suspected for vacuum leaks ?

On the coils yes they could be contributory. I once had fine cracks in a couple of my coils and when humidity was high (rainy day) I'd get a bad miss on those 1 or 2 cylinders.

Replacing them was they key. Hasn't happened since, and 4 are original.

(This was wifes wagon with M112, but same engine as ML320)

Have you cleaned your MAF Sensor ? Or replaced ?

How many miles on your rig ?

David

PS: Off topic, but what kind of Jets do you pilot, if I may inquire ?
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post #5 of 15 (permalink) Old 05-08-2019, 03:32 AM
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Jet i have just replaced all my HT leads and distributor cap along with the rotor arm and these have been in the car from new for a total of 30 years.And after reftting with new Bosch cap and rotor and Beru ht leads i can see no change at all .So i wish i had left sleeping dogs lie and keept my cash in my wallet .
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post #6 of 15 (permalink) Old 05-08-2019, 05:57 PM
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Plinker,

You're referring to a different MB perhaps, yes ?

I don't believe there is a distributor cap on our M112 / M113 engines, unless its hidden, that is !

But same Principle applies; things often last longer than we expect, lol.

David in East Texas
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post #7 of 15 (permalink) Old 05-08-2019, 06:18 PM
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Quote:
Originally Posted by Jetpilot718 View Post
Ive probably got 50K miles on the plugs and wires. What kind of longevity should I expect from them?
I was expecting 60+k miles from my Bosch Platinum Plus plugs but they started intermittently misfiring from 56k miles.

I put up with the misfires until I renewed the plugs at 64k miles (8 yrs) that solved the problem. Should have binned the old ones after 7 yrs.

Iíve only replaced 3 wires out of 12 so far. The other 9 have 17 years on them.
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post #8 of 15 (permalink) Old 05-08-2019, 07:50 PM
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There are many things that can cause rough idle from plugs, wires to injectors. I would normally expect 80 to 100k out of plugs and wires. I made the mistake of putting Bosch splitfires in mine. Don’t. They just don’t perform well in these engines. One thing to look for if you have a rough idle is the catalytic converters. I removed the secondarys and replaced the primary cats and it made an amazing difference in performance.
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post #9 of 15 (permalink) Old 05-08-2019, 07:57 PM
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+1 with Art

Scan the engine for a misfire. If it doesnít have any go with Arts suggestion. The vacuum lines should be all change throughout the engine bay at the age of the car anyway.


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post #10 of 15 (permalink) Old 05-08-2019, 08:27 PM Thread Starter
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Quote:
Originally Posted by AutohausAZ View Post
How many miles are on that engine? As an engine wears, uneven compression between cylinders and slight misfires eventually roughens the idle.
Hmm good point! This is definitely the highest mile engine I've ever owned at close to 150K miles. The slight roughness is nothing worse than my 350Z did from literally brand new. It always felt like it had a "hiccup" but that was due to the relatively aggressive cams and stiff engine/trans mounts.

Quote:
Originally Posted by art_arev View Post
look for a vacuum leak
All new hoses under there. I haven't smoke checked, but next Cuban I bring home will be a good enough excuse to light one up and head to the garage

Quote:
Originally Posted by 2000 E 320 White Wagon View Post
Jetpilot:

Good questions !

I'd guess 100k for plugs; wires that or maybe more.

But if plugs over 100k, it's not to much to thrown new wires on 'just in case', right ?

I'm personally, avoiding the plug job as my M113 V-8 runs great so far.

If mpg tanks, or big misfire happens, I'll pull them.

Basically, rig was perfectly clean when I got it at 102k and 3 years ago, and I am going on the assumption plugs were done by the $$$ prior owner.

But at 150k now, I do wonder. Just have a busy life and yanking 16 plugs sounds both unnecessary & distracting.

My idle is slightly lumpy, not bad, and combined with my loud performance exhaust, sounds a bit menacing.

Every once in a while a Charger or Mustang or Vette wants to race. So, there are upsides to a lumpy idle, LOL !

But I digress, amen to checking for a vacuum leak. I'm sure those who know more can give direction.

I know there are molded vacuum hoses that are on top of engine - the ones that must remove if doing valve cover gaskets - are those the ones that are suspected for vacuum leaks ?

On the coils yes they could be contributory. I once had fine cracks in a couple of my coils and when humidity was high (rainy day) I'd get a bad miss on those 1 or 2 cylinders.

Replacing them was they key. Hasn't happened since, and 4 are original.

(This was wifes wagon with M112, but same engine as ML320)

Have you cleaned your MAF Sensor ? Or replaced ?

How many miles on your rig ?

David

PS: Off topic, but what kind of Jets do you pilot, if I may inquire ?

Vac hoses appear to be good. Also, coils have no cracking and all appear to be in good shape as well. I haven't cleaned/replaced the MAF because in my experience cleaning them was always no difference or short lived anyways. I could replace, but at $150 I don't think I really have any reason to suspect the MAF as a culprit yet.

I'm just shy of 150K on my 2001. What I did find however was a slight leak on the right bank valve cover which was pooling oil into one of the spark plugs. After cleaning out the oil in the wire with some deox/it, and cleaning the plug tube with some rifle swabs, the rough idle is almost completely gone.

I've got a new set of Vic Reinz' gaskets to throw in to stop the leak. Then I'll remove the spark plugs near the leak and inspect/clean them. I assume MAF cleaner will be OK to cut through whatever film of oil may be causing resistance.

Overall MPG on the highway is just shy of 22, which isn't bad for an 18y/o single cam V8.

Edit: I fly Embraer 190 regional jets for a US based airline. It's a 100 seat jet that looks like a B737.
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