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My19 GLC63 had a misfire in Sport + but only in one cylinder. They thought the coil so they moved it and the issue remained in that cylinder. It turns out it was a spark plug issue. Changed the one out and it's perfect. My car only has 57k km on it so low km and the plugs aren't due for another 40k. Cost me $600 all in to diagnose and replace the one plug. They couldn't run it through either warranty (power train and extended) because it's a wearable part.
I’m not trusting Carfax maintenance reports anymore. I went down to the dealership today and looked at the spark plugs they pulled out they were black and look like never been changed. Carfax shows spark plugs were changed at MB dealership 4000 miles ago but there’s no way.
I’m not trusting Carfax maintenance reports anymore. I went down to the dealership today and looked at the spark plugs they pulled out they were black and look like never been changed. Carfax shows spark plugs were changed at MB dealership 4000 miles ago but there’s no way.
or they were replaced and they were getting fouled from other engine issues (air/fuel) - this engine may have had issues ongoing (known or unknown to the previous owner) before you bought it
Last edited by PeterUbers; Oct 23, 2024 at 10:49 PM.
Yea that is a possibility, it doesn’t help that my service advisor went on vacation and I’m stuck with a “floater” that doesn’t seem to have much experience. He called me the second day after having the car there saying “the warranty won’t cover this because it doesn’t kick in until after 30 days of ownership” so I had to correct him and tell him that it starts the same day of purchase. Then yesterday he made another ridiculous comment saying that if the engine ends up needing replacement “the warranty company will just cut you a check for what you paid for the policy and be done with it”.
Originally Posted by PeterUbers
or they were replaced and they were getting fouled from other engine issues (air/fuel) - this engine may have had issues ongoing (known or unknown to the previous owner) before you bought it
Yea that is a possibility, it doesn’t help that my service advisor went on vacation and I’m stuck with a “floater” that doesn’t seem to have much experience. He called me the second day after having the car there saying “the warranty won’t cover this because it doesn’t kick in until after 30 days of ownership” so I had to correct him and tell him that it starts the same day of purchase. Then yesterday he made another ridiculous comment saying that if the engine ends up needing replacement “the warranty company will just cut you a check for what you paid for the policy and be done with it”.
see that previous link with a guy they needed engine replacement with fidelity - he got $32k which was a re man engine, and the cost of the car was $52k at the time of engine replacement. Your policy should cover you for at least the cost of the car according to NADA value.
so I have, like you, have no idea was this interim SA is telling you about cutting a check for what you paid for the policy (~ $5000??) and be done with it, lol. What would be the point of having a warranty if that's all they did and didnt even cover some of it? @Highline-Autos.com has been super helpful sorting through anecdotes of fidelity claims on this forum and I think he sells a great warranty product.
post#4
Last edited by PeterUbers; Oct 24, 2024 at 08:28 AM.
I’m not trusting Carfax maintenance reports anymore. I went down to the dealership today and looked at the spark plugs they pulled out they were black and look like never been changed. Carfax shows spark plugs were changed at MB dealership 4000 miles ago but there’s no way.
I just called and confirmed with the MB dealer that was on the Carfax and they confirmed they replaced all 8 spark plugs 4000 miles ago back in January 2024. For them to be this black already means theres definitely an underlying engine issue.
called what? His plugs were replaced 4000 miles ago (likely the previous owner was sorting through misfires as well) and his head is cracked and/or he may need a new engine.
your issue fortunately was simply a spark plug change, his issue is much bigger it would seem.
You did not have compression issues on your GLC63.
called what? His plugs were replaced 4000 miles ago (likely the previous owner was sorting through misfires as well) and his head is cracked and/or he may need a new engine.
your issue fortunately was simply a spark plug change, his issue is much bigger it would seem.
You did not have compression issues on your GLC63.
I knew as soon as he had misfires it was going to be plug related and not coils. I didn't need to have a compression test completed on my car.
I knew as soon as he had misfires it was going to be plug related and not coils. I didn't need to have a compression test completed on my car.
R.K.
not sure if you saw, his compression test was abnormal. His issue is not plug related. He is misfiring due to a head issue or a block issue. He never mentioned coils. Once again your issue is different than his issue, as it would seem based on his report. His plugs are black perhaps because they are fouled due to the poor air/fuel mix compensating for compression issues, poor detonation etc
again - you're saying all he needs is 8 new plugs and he's good to go?
Last edited by PeterUbers; Oct 24, 2024 at 01:13 PM.
based on this one would be silly to buy a used e63 if he wanted to drive it aggressively, having no idea of the previous driving pattern (which is what everyone buying a used e63 probably does a few hours/days into ownership like the OP)
so you're saying the best you can hope for is gradually take your used e63 and ramp up aggressive driving until it's conditioned to tolerances sufficient to mitigate the stresses of hard launches etc?
LMAO, I'm laughing at every post this swiss guy makes. Must be a child.
Just got a call that cylinders 5 and 6 have low compression, he said tomorrow they will verify 100% if cylinder head needs to be replaced before calling fidelity. It just sucks that this happened after only 3 days of buying it I can’t help but feel like I got screwed but then again I drove it 300 miles with no codes so I don’t necessarily think it was a pre existing issue.
Sorry this happened to you OP at least you have some warranty on this. PPI is always a must on high performance used vehicles, but hindsight is 20/20. Hope they make this right for you, have you tried reaching out to the dealership you bought this from and see if they are willing to do anything as good faith? May also want to look into your state's local laws regarding this.
not sure if you saw, his compression test was abnormal. His issue is not plug related. He is misfiring due to a head issue or a block issue. He never mentioned coils. Once again your issue is different than his issue, as it would seem based on his report. His plugs are black perhaps because they are fouled due to the poor air/fuel mix compensating for compression issues, poor detonation etc
again - you're saying all he needs is 8 new plugs and he's good to go?
The Audi dealership I bought it from are scumbags and refused to do anything all they said was well at least you got extended warranty on it. The GM told me it was a friend of his that traded it in and that the guy maintained it very well. I already filed a complaint with the state office and have an investigator assigned looking into all the paperwork. Now I know for next time to get a PPI including a compression test beforehand.
Originally Posted by raudiace4
Sorry this happened to you OP at least you have some warranty on this. PPI is always a must on high performance used vehicles, but hindsight is 20/20. Hope they make this right for you, have you tried reaching out to the dealership you bought this from and see if they are willing to do anything as good faith? May also want to look into your state's local laws regarding this.
The floater/ fill in service advisor is extremely lazy and has even tried telling me that it won’t be covered because warranty doesn’t kick in until 30 days after purchase lol so I had to correct him and tell him it starts the minute I drive off the lot. And that comment that he made about them just refunding me was the most ridiculous thing I’ve ever heard. Not sure how these guys work at one of the highest selling Mercedes dealerships in Texas.
Originally Posted by PeterUbers
see that previous link with a guy they needed engine replacement with fidelity - he got $32k which was a re man engine, and the cost of the car was $52k at the time of engine replacement. Your policy should cover you for at least the cost of the car according to NADA value.
so I have, like you, have no idea was this interim SA is telling you about cutting a check for what you paid for the policy (~ $5000??) and be done with it, lol. What would be the point of having a warranty if that's all they did and didnt even cover some of it? @Highline-Autos.com has been super helpful sorting through anecdotes of fidelity claims on this forum and I think he sells a great warranty product.
Xentry should log the first time this happened. Are you able to get that type of detail from your tech? If it happened prior to the dealer selling it, you may have some ammo if needed. Was the car sold as-is? Are you in a state that requires a thirty day 3k mile warranty on used vehicles?
The Audi dealership I bought it from are scumbags and refused to do anything all they said was well at least you got extended warranty on it. The GM told me it was a friend of his that traded it in and that the guy maintained it very well. I already filed a complaint with the state office and have an investigator assigned looking into all the paperwork. Now I know for next time to get a PPI including a compression test beforehand.
Kinda shocked to hear an Audi dealership would act like this, but perhaps they really didn't know. Good luck with the state office and complaints.
Guys I finally got the results from the diagnostics! But they make no sense to me. Can someone please tell me if this makes any sense. They told me that the misfire is caused by a bad charge air distributor seal. Ok sounds about right especially since there was air intake leak codes too. But how in the world would that cause cylinders 5 and 6 to have low compression?? I dont think there’s any correlation between the air intake and engine compression. Can someone who in knowledgeable about this please let me know if this sounds like a proper diagnosis or not??
I will ask on Monday, but no it was purchased in Colorado so it was as is no warranty.
Originally Posted by Baltistyle
Xentry should log the first time this happened. Are you able to get that type of detail from your tech? If it happened prior to the dealer selling it, you may have some ammo if needed. Was the car sold as-is? Are you in a state that requires a thirty day 3k mile warranty on used vehicles?
Guys I finally got the results from the diagnostics! But they make no sense to me. Can someone please tell me if this makes any sense. They told me that the misfire is caused by a bad charge air distributor seal. Ok sounds about right especially since there was air intake leak codes too. But how in the world would that cause cylinders 5 and 6 to have low compression?? I dont think there’s any correlation between the air intake and engine compression. Can someone who in knowledgeable about this please let me know if this sounds like a proper diagnosis or not??
As I understand it, a bad charge air distributor seal can lead to premature piston, ring and valve failures. The oil leaking due to the bad seal basically can cause secondary issues. Once the seal is replaced, I'm guessing your engine needs some cleanup and potentially further repairs. Just replacing the seal won't fix the low compression in cylinders 5 and 6. Next question is what caused the seal to fail. Exposure to moisture and contaminants can cause the seal to fail over time. This goes back to my earlier point that one person found laughable, but frequent short distance driving, and the engine oil not reaching at least 212F for long periods causes water and fuel from the combustion to get into the oil and not evaporate as it should, leading to corrosion and lubrication issues.
Last edited by superswiss; Oct 25, 2024 at 07:28 PM.
With that being said if the bad seal actually caused the cylinder failure would fidelity warranty cover that?
Originally Posted by superswiss
As I understand it, a bad charge air distributor seal can lead to premature piston, ring and valve failures. The oil leaking due to the bad seal basically can cause secondary issues. Once the seal is replaced, I'm guessing your engine needs some cleanup and potentially further repairs. Just replacing the seal won't fix the low compression in cylinders 5 and 6. Next question is what caused the seal to fail. Exposure to moisture and contaminants can cause the seal to fail over time. This goes back to my earlier point that one person found laughable, but frequent short distance driving, and the engine oil not reaching at least 212F for long periods causes water and fuel from the combustion to get into the oil and not evaporate as it should, leading to corrosion and lubrication issues.
With that being said if the bad seal actually caused the cylinder failure would fidelity warranty cover that?
That's a good question and it crossed my mind as well, but I don't have the answer. I suppose technically they could argue that the seal failed due to external circumstances such as how the car was driven. On the other hand, AMG sells these things into a market that's notorious for unfavorable driving conditions. I would think that in order to have a leg to stand on and reject the warranty claim, they would have had done a thorough inspection of the car before issuing the warranty and document any pre-existing conditions.
......... This goes back to my earlier point that one person found laughable, but frequent short distance driving, and the engine oil not reaching at least 212F for long periods causes water and fuel from the combustion to get into the oil and not evaporate as it should, leading to corrosion and lubrication issues.
I agree with this point 100% I hope it wasn't a post of mine that sounded like it contradicted this point. My belief is that his problems are 100% based on what happened prior to him buying the car! This dealer probably also knew about it.
Guys I finally got the results from the diagnostics! But they make no sense to me. Can someone please tell me if this makes any sense. They told me that the misfire is caused by a bad charge air distributor seal. Ok sounds about right especially since there was air intake leak codes too. But how in the world would that cause cylinders 5 and 6 to have low compression?? I dont think there’s any correlation between the air intake and engine compression. Can someone who in knowledgeable about this please let me know if this sounds like a proper diagnosis or not??
You should call the owner of the dealership directly. Tell hime this happened on the 3rd day of ownership. Most reputable dealerships have some type of customer satisfaction policy, usually 7-30 days, some offer as much as 60 days. This is ridiculous!!
Received a final verdict from MB service today! Turns out the engine compression is fine and within spec, they told me that cylinders 5 and 6 had lower compression than other cylinders when they were checked most likely due to the air/fuel ratio because there is an air intake leak. This was their recommendation: Remove charge air coolers and replace boot between throttle body and intake manifold, as well as replace spark plugs. Does anyone know if this boot will be covered under fidelity warranty? Will be checking on it tomorrow. If not I’ll most likely take it to get it replaced somewhere else because the price they quoted is insane. I’ll update once repairs are done.
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