When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
You’re just asking for trouble using that set. Fcp euro has a lifetime warranty on everything they sell.
The plugs are an unknown brand, you don’t know the electrode composition, or life, im sure they are not platinum-iridium that last 130000. They might fail at 15000.
The heat range, operating temperature of the plug is exact within a narrow range, it is unique to each motor. The improper plug temperature could foul the plugs fast or melt them . Even known brands can have build issues. Those could , and will probably be a nightmare.
The coils, could be the wrong voltage output, but nobody is going to test them, they play not give voltage needed for proper combustion.
PASS , you don’t want to experiment! Labor is a big part of this job. I think it will cost you double using them.
The coils that MB built into your GLK will outlast the car, and work as well 20 years from now as they do today. The ones you're looking at? Who knows? But I've seen an awful lot of people end up building "new and exciting problems" into their cars with aftermarket coils.
And the plugs? High-quality plugs are cheap. Gas is expensive. Go NGK or Bosch or other "serious plug". Save the money you were going to spend on lesser coils and spend it on a transmission fluid swap and really do the car a favor. ;-)
Habby, I must disagree about the MB / Beru factory coils. I had one fail catastrophically, literally burst, arc out and disable an entire cylinder bank. Shortly after I sorted that mess out a second factory coil failed in less dramatic fashion. I do agree that the spark plug job is Very laborious and "tricky" due to space concerns. If I had proactively changed out the coils when I did the plugs(Bosch) I would have avoided the subsequent coil failure episodes. I switched to the upgraded Bosch units, not costly, from FCP Euro.
I also agree absolutely stay away from obscure off brands. Its not money you save its money you don't spend today...
Last edited by PACIFICMAN; Mar 14, 2024 at 04:11 AM.
You do need to replace Plug Boots ! At 70000 I didn’t , I just did plugs . I was running on 4 cilinders until I replaced them all !! You really can’t drive on 4 cylinders !
read the condition of your plugs ( research it) I had one burning cold so I replaced that coil hoping it had only weak spark . If plugs are not burning light brown and clean , try a new coil for that plug. And use a name brand like Bosch, not China Shiney
What made you change boots? My car has slight rough idle with brakes on. When shifted into neutral it goes away. Otherwise runs smooth. Plugs were changed at 70k miles.
I changed plugs, my mechanic said I should change the boots . I said no, not knowing how they age and don’t like being removed replaced. After he did the plugs I drove home on 3-4 cylinders. I barely made it home. I was running perfectly before I changed the plugs . New boots fixed it. I did also change one coil where the plug, one plug, was darker , indicating it was running cooler. Don’t ever use Chinese parts on your car, they- auto zonesss are selling junk that costs mechanics and customers countless costs in agony. It’s Chinas secret war. Once I went through 7 starters , then changed brands. The mechanic did it free, but he lost, and I lost 8 days ! FCP euro guarantees everything, you can actually return used oil and brakes !! Buy genuine parts from a real supplier. When I was buying plug Autozone ordered the wrong ones , to really know your plug you must use the VIN and for anything you order . There are to many variations today
If you used quality plugs before you might not need plugs. They last 100000+. It could be a boot , one coil , an injector, or something else. A bad ring or Valve or carbon in the intake !! Locate the one cilinder and check that plug and a few others and read their condition. If you put in that Chinese Surprise, you likely would have a mess.
A good local mechanic with a good scan tool should find the cause. most any auto store runs codes for free ( to sell parts) maybe they could find it , for a few $. It could be easy 6 different things , or more .
first try injector cleaner , Alcohol in the gas like Heat, several cans , and highway driving .
And a different brand of gas! With bad or real old gas I’ve needed a gallon of alcohol !
2014 GLK350 base model (active) ; 2001 E320 base (retired); 2001 Wrangler soft-top
I'm sure you're convinced by now that the highly questionable "complete kit" is a bad decision, both financially and longevity-wise.
Very lengthy discussions in various motorcycle groups about spark plugs have a general consensus:
Beware of buying NGK plugs, except from a reputable parts store. IOW, don't buy from eBay or some Amazon hosted store, because NGK fakes are notoriously sold as the real thing. There's even a website about identifying fake NGKs - and there are many YouTube video on the subject.
So, if you do decide to go NGK, only buy from a local nationwide parts shop. (like AutoZone, NAPA, OReilly, etc).
The only place I'd buy from, online-wise, would be FCPEuro. And as far plugs go, I'd only use Bosch.
I read about the ngk fraud and how to spot them on YouTube, I got fed up with Autozone and being worried just went to MB. Yes the right plugs of proper heat range and construction are critical . A cheap Chinese might even break and ruin a motor !
I read about the ngk fraud and how to spot them on YouTube, I got fed up with Autozone and being worried just went to MB. Yes the right plugs of proper heat range and construction are critical . A cheap Chinese might even break and ruin a motor !
Anyone try Autolite Iridium Ultra Laser spark plugs AI 5702 , is a fit for GLK350
Last edited by m00nd0gy; Mar 14, 2024 at 06:00 PM.
2014 GLK350 base model (active) ; 2001 E320 base (retired); 2001 Wrangler soft-top
Originally Posted by m00nd0gy
Anyone try Autolite Iridium Ultra Laser spark plugs AI 5702 , is a fit for GLK350
What's the attraction with the Autolite?? Cost?
I looked up our 2014 GLK350 Base, and Bosch at the local auto parts are 13.50 USD each. I'd consider that minimal cost (bargain?), considering the mileage one gets out of these plugs.
The only other plug they have that fits our GLK, are Champion for 10 USD each. The price difference doesn't entice me to *not* use Bosch.
I looked up our 2014 GLK350 Base, and Bosch at the local auto parts are 13.50 USD each. I'd consider that minimal cost (bargain?), considering the mileage one gets out of these plugs.
The only other plug they have that fits our GLK, are Champion for 10 USD each. The price difference doesn't entice me to *not* use Bosch.
I’m in general agreement with the consensus here that Bosch or NGK spark plugs are the default choices. Mercedes uses one or the other at the factory.
But I also believe the Autolite double platinum plugs would be suitable. I’ve used them in other applications. You probably have the M272 engine in a 2011 GLK350. In a later GLK with M276 engine I would not use anything but the factory plug in an MB box because of specific design match to the engine. The M272 is not so picky.
The coils “should” last longer than the 70k miles, but the truck is 13 years old, so maybe not. To check them takes an oscilloscope, which is unreasonable for most DIYers. I like the comment about looking for plugs that are not running light tan to find weak coils. I recommend the Bosch coils because a number of people have had the factory Beru coils blow out.
Now - the plug boots. Change them all. They can be purchased separately from the coils. Time and heat are the enemy of plug boots. Over time and heat soaked in the head, they lose their dielectric properties. They can look fine and be electrically leaky.
I’m in general agreement with the consensus here that Bosch or NGK spark plugs are the default choices. Mercedes uses one or the other at the factory.
But I also believe the Autolite double platinum plugs would be suitable. I’ve used them in other applications. You probably have the M272 engine in a 2011 GLK350. In a later GLK with M276 engine I would not use anything but the factory plug in an MB box because of specific design match to the engine. The M272 is not so picky.
The coils “should” last longer than the 70k miles, but the truck is 13 years old, so maybe not. To check them takes an oscilloscope, which is unreasonable for most DIYers. I like the comment about looking for plugs that are not running light tan to find weak coils. I recommend the Bosch coils because a number of people have had the factory Beru coils blow out.
Now - the plug boots. Change them all. They can be purchased separately from the coils. Time and heat are the enemy of plug boots. Over time and heat soaked in the head, they lose their dielectric properties. They can look fine and be electrically leaky.
My 2 bits. Good luck with it.
Thank you. I purchased new plug boots plus the Autolite Iridium laser plugs on sale for under $10 each, the packaging says made in Mexico. That is my concern. I used NGK at about 70k miles, seem ok, now they're $17 each.
I found this on ebay, they sell bosch also. I don't like their shipFrom origin. Box says made in germany. Difficult to trust anyone these days. https://www.ebay.com/itm/33501859840...3Avlp_homepage
Here is Popular Science spark plug review article. Then I sourced local availability and price. Something to do during retirement, I have too much free time ... https://www.popsci.com/gear/best-spark-plugs/
Ship from origin does seem like a bit of a red flag. Maybe Bosch has them made in China these days but that wouldn't make me too happy either. That's not to bash China. They produce junk and some very high quality stuff and everything in between but at times it seems a lottery.
Originally Posted by m00nd0gy
Thank you. I purchased new plug boots plus the Autolite Iridium laser plugs on sale for under $10 each, the packaging says made in Mexico. That is my concern. I used NGK at about 70k miles, seem ok, now they're $17 each.
I found this on ebay, they sell bosch also. I don't like their shipFrom origin. Box says made in germany. Difficult to trust anyone these days. https://www.ebay.com/itm/33501859840...3Avlp_homepage
Ship from origin, only the Chinese use poor English . Counterfeit are known in spark plugs . Stop trying to save and expose yourself. If it’s to cheap there is a reason. Also Iridium are the proper plug metal, not other metals . I use Fcp euro for everything, I’m seeing to much crap Chinese stuff mess up mechanics and customers . And I’m not in the business
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
