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I’d like to first start by saying I love this car. There are a few minor things I wished I could change like standard wireless CarPlay or maybe a little better up front compartment space but over all this is a great, roomy, powerful car……….but……….
This morning backing into the garage at 9292.3 miles I started feeling a vibration and looked down and the check engine light was flashing. It took me a minute to realize what was going on and I grabbed my phone to document it but it stopped and the light went off. I guess it lasted about 15-20 seconds. Oh well, here’s to hopefully it never happening again.
I wonder if this is why MB might be cutting back on some of their V8s.
I’d like to first start by saying I love this car. There are a few minor things I wished I could change like standard wireless CarPlay or maybe a little better up front compartment space but over all this is a great, roomy, powerful car……….but……….
This morning backing into the garage at 9292.3 miles I started feeling a vibration and looked down and the check engine light was flashing. It took me a minute to realize what was going on and I grabbed my phone to document it but it stopped and the light went off. I guess it lasted about 15-20 seconds. Oh well, here’s to hopefully it never happening again.
I wonder if this is why MB might be cutting back on some of their V8s.
Is it the same shaking you had on your previous buyback GLE580?
I’d like to first start by saying I love this car. There are a few minor things I wished I could change like standard wireless CarPlay or maybe a little better up front compartment space but over all this is a great, roomy, powerful car……….but……….
This morning backing into the garage at 9292.3 miles I started feeling a vibration and looked down and the check engine light was flashing. It took me a minute to realize what was going on and I grabbed my phone to document it but it stopped and the light went off. I guess it lasted about 15-20 seconds. Oh well, here’s to hopefully it never happening again.
I wonder if this is why MB might be cutting back on some of their V8s.
On a road trip this week, and pulled off the road for a few minutes to tweak my GPS destination. When I did, got the flashing engine problem light. Stopped, turned off the SUV and turned it on again, and it was OK. Have my first service shortly, so will chat with the service advisor then about it. Scared me.
On a road trip this week, and pulled off the road for a few minutes to tweak my GPS destination. When I did, got the flashing engine problem light. Stopped, turned off the SUV and turned it on again, and it was OK. Have my first service shortly, so will chat with the service advisor then about it. Scared me.
Please let us know what happens. I am due for service but cannot get in till the end of the month. I’m going to bring it up too.
Are you both getting engine shaking or vibration with the CEL?
Yes. Yesterday I noticed the car shaking as I was backing in and stopped halfway in the garage to confirm what I was feeling. I looked down and the CEL was flashing. I though for a second, oh crap, then reached for my phone to video it and the light went off and the car was normal again.
If this is something that only happens ever 9k miles, I’ll live with the otherwise great car.
Well I was going through my phone pictures today, cleaning up my phone, and getting some for Christmas when I found a 3 second video I didn’t know I had. It catches the last flash of the CEL before it resets. I just took a screen shot of the video with the light on. Now I have proof for the dealership.
My CEL light flashed for a bit before staying lit. Then went away when I turned the engine off and on again. Will be making my first service appointment when I get home from our current road trip. Will try to provide some feedback here if I get any info from that service.
Uh oh! This is the second time it’s happened.
While driving home tonight on the interstate my wife and I both commented that the car was shaking. I get home and back into the garage again and I have another CEL. I’ll be stopping by the dealership tomorrow. It might be bad………..
Hmmm, no replication on the problem on my GLE at this point. Have had several 'rough engine' episodes, usually at low speeds, but no CEL light.... Just about to the point of needing the first service (10,000 miles) so will have a chance to chat with the service advisor about it.
Yes. It always seemed to be “rough” at low RPM speeds. Like when I was barely on the gas. If I got harder on the gas it smoothed out. But then as soon as I let off and went to coasting it came back rough. It felt like a tire was really out of balance but always smoothed out when I added a little fuel.
I wonder if I should just keep my mouth shut and let the dealership buy it off me since they will probably pay top dollar.
Yes. It always seemed to be “rough” at low RPM speeds. Like when I was barely on the gas. If I got harder on the gas it smoothed out. But then as soon as I let off and went to coasting it came back rough. It felt like a tire was really out of balance but always smoothed out when I added a little fuel.
I wonder if I should just keep my mouth shut and let the dealership buy it off me since they will probably pay top dollar.
Well, as I have a GLE580 not sure I could get something equivalent. Looks like, at this time, only the GLS is a V8 and that is hugely more expensive than my GLE580. Will see what the service advisor says. Still have an 'optimistic' view that MB wants to be the 'best' they advertise, and will want to make us happy... More than willing to believe them, but also willing to start spreading the word that a Mercedes is not really any better than a much less expensive option. Have had several mailings from companies that are asking me to 'rate' my vehicle. Have resisted it so far, but experience will cause me to either validate MB as great, or start talking up their fall from grace... Would hate to have to do that, but.....
Yes. It always seemed to be “rough” at low RPM speeds. Like when I was barely on the gas. If I got harder on the gas it smoothed out. But then as soon as I let off and went to coasting it came back rough. It felt like a tire was really out of balance but always smoothed out when I added a little fuel.
I wonder if I should just keep my mouth shut and let the dealership buy it off me since they will probably pay top dollar.
Getting back to basics...make sure the tech checks the basics...and doesn't just look for a code (that may not be there).
10 Causes Of Car Engine Has Rough Idle (How To Fix It) (mechanicbase.com) The most common cause of rough idle is a vacuum leak or a failed PCV valve. It could also be caused by other air-fuel mixture-related issues like bad fuel injectors, EGR valves, or low compression. In rare cases, it is caused by misfires from a bad spark plug or coil.
Getting back to basics...make sure the tech checks the basics...and doesn't just look for a code (that may not be there).
10 Causes Of Car Engine Has Rough Idle (How To Fix It) (mechanicbase.com) The most common cause of rough idle is a vacuum leak or a failed PCV valve. It could also be caused by other air-fuel mixture-related issues like bad fuel injectors, EGR valves, or low compression. In rare cases, it is caused by misfires from a bad spark plug or coil.
Thanks '91 ('73 here...). Will see if my service advisor has an idea about the CEL light. As it only happened once at this point, am not too concerned about it, but am a bit more worried about the low rpm ragged engine thing... About 400 miles from my 'A' service, so should make that happen next week. Will try to update this thread with anything that might be interesting to the forum.
Well I stopped by the service department this morning and the service manager didn’t have time to talk after he walked out, looked in my direction and then turned around and walked off. I got a feeling this is not going to go well.
I’ll also say this, this is a great SUV but the V8 has a problem that I bet MB knows about.
Well I stopped by the service department this morning and the service manager didn’t have time to talk after he walked out, looked in my direction and then turned around and walked off. I got a feeling this is not going to go well.
I’ll also say this, this is a great SUV but the V8 has a problem that I bet MB knows about.
I’ve wondered that myself. I’m not hearing a lot about it so I wonder what I’m doing to specifically cause it.
It seems to only happens at low to idle speed, stops when there is throttle applied and then seems to happen more when it’s cold. Looking back I think I remember having a lot of heating elements on. I’m confused too but worried about what is going on and more concerned about what is going to happen to correct this problem overall.
Well I stopped by the service department this morning and the service manager didn’t have time to talk after he walked out, looked in my direction and then turned around and walked off. I got a feeling this is not going to go well.
I’ll also say this, this is a great SUV but the V8 has a problem that I bet MB knows about.
yep, I think that problem is called dual LPFP, directly controlled by the ECU itself over the VIP CAN-C.
I read that thread, it deals with the fun of replacing the two interconnected fuel pumps.
The problem that I see is are 3-phase PWM controllers generating EMF noise. It's not filtered, not shielded, not twisted, no kidding!!
Mix that in harnesses and the glitches becomes a reliable source of random chaos.
Same thing up-front with the 100Amp smart PWM radiator fan...
Rugged CAN are supposed to be noise immune and fault tolerant... but within limits.
Circling the drain is the opposite of the best performance. CAN datagrams get impacted by high retransmits that introduce high latency.
When the ECU+TCU timings are unimpacted by delays, the powertrain feels like luxurious velvet with ultra nimble controls : accelerator pedal, steering, brakes.
Last edited by CaliBenzDriver; Dec 21, 2021 at 03:01 PM.
I read that thread, it deals with the fun of replacing the two interconnected fuel pumps.
The problem that I see is are 3-phase PWM controllers generating EMF noise. It's not filtered, not shielded, not twisted, no kidding!!
Mix that in harnesses and the glitches becomes a reliable source of random chaos.
Same thing up-front with the 100Amp smart PWM radiator fan...
Rugged CAN are supposed to be noise immune and fault tolerant... but within limits.
Circling the drain is the opposite of the best performance. CAN datagrams get impacted by high retransmits that introduce high latency.
When the ECU+TCU timings are unimpacted by delays, the powertrain feels like luxurious velvet with ultra nimble controls : accelerator pedal, steering, brakes.
My understanding of CAN BUS is that they have sufficient redundancy, and call-and-answer safeguards, that a fan or fuel pump's virtually insignificant EMF is well below any threshhold of interference. And the back EMF from a PWM motor should be shaped so that it doesn't interfere.
I agree that beyond that threshhold, re-transmission can create latency, but isn't that so far above the design limits, that it's not a factor?
My understanding of CAN BUS is that they have sufficient redundancy, and call-and-answer safeguards, that a fan or fuel pump's virtually insignificant EMF is well below any threshhold of interference. And the back EMF from a PWM motor should be shaped so that it doesn't interfere.
I agree that beyond that threshhold, re-transmission can create latency, but isn't that so far above the design limits, that it's not a factor?
... yes, that plus the fact it's hard to pin glitches with Xentry.
It all works within limits 97% of the time under derated modes. Great performance is in the oposite quadrant of that.
Last edited by CaliBenzDriver; Dec 21, 2021 at 04:04 PM.
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.
