pinging under heavy accel

[crazy1469]

so i have been noticing that when i punch it the initial burst will cause my engine to ping...i am using 94 octane so that should eliminate poor fuel, the car is completely stock there should be no reason for it to ping!!!

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[Maverick1975]

Unfortunately these engines are notorious for pinging. I took my ML63 to dealer and they "played around with timing" and fixed it. I occasionally get pinging in all my AMGs but very intermittent.

[WagsC63]

How are you noticing the pinging???
If you can hear hear it audibly over the loud exhaust note, I'd be worried that it must be a heavy knock!!

[DuaneC63]

Very strange since I'm stuck with 91 craptane and am also totally stock, but no pinging at all.

[Harold1898]

Originally Posted by crazy1469

so i have been noticing that when i punch it the initial burst will cause my engine to ping...i am using 94 octane so that should eliminate poor fuel, the car is completely stock there should be no reason for it to ping!!!

Almost certainly fuel/timing related if it is pinging.

[WagsC63]

Bit worried about Maverick with his pinging.
Oz fuel has high RON, so shouldn't ideally ping compared with lower RON fuels in US?

[SonnyakaPig]

Originally Posted by DuaneC63

Very strange since I'm stuck with 91 craptane and am also totally stock, but no pinging at all.

I'm envious. I've had two C63's and both pinged pretty regularly on 91 octane. The inside of the gas door says minimum 93. With higher octane the car runs much better and no pinging. I've heard of other 63's that don't ping on 91 octane so I don't know what the story is with my cars. Anyway, the ECU will protect the motor in quick fashion when it senses knock.

[Merc63]

I have no clue how your engine is pinging off 91 octane... There are knock sensors on the engine that will retard the timing if it senses knock (pinging)... I believe the engine has the ability to protect itself a fair amount.

Realistically, you could put 87oct in these engines and they would just retard the timing to adapt to the fuel.

I believe its something else.

[SonnyakaPig]

Originally Posted by Merc63

I have no clue how your engine is pinging off 91 octane... There are knock sensors on the engine that will retard the timing if it senses knock (pinging)... I believe the engine has the ability to protect itself a fair amount.

Realistically, you could put 87oct in these engines and they would just retard the timing to adapt to the fuel.

I believe its something else.

When 91 octane is used some cars will ping. As soon as you increase the octane the pinging stops. That's why it's odd that OP's car is doing this on 94 octane.

[Merc63]

Originally Posted by SonnyakaPig

When 91 octane is used some cars will ping. As soon as you increase the octane the pinging stops. That's why it's odd that OP's car is doing this on 94 octane.

I find that hard to believe. Perhaps they have a faulty knock sensor than.


Maybe Weistec can tune in on the M156's ability to retard timing and protect itself.

[crazy1469]

I always use 94 octane..I to take the car in next week and have them take a look at it....there is no way that an engine with 40k using 94octane should ever ping

[Pit-Pony]

The fuel, how can you be really be sure what you used is what what advertised at the pump?

Or if the fuel was stale or had some water in it?

Try another source for fuel and check again.

[b16]

Originally Posted by Pit-Pony

The fuel, how can you be really be sure what you used is what what advertised at the pump?

There should be a seal/stamp from the state department of weights and measures that certifies the octane rating at the pump.

[Jons95c36amg]

No pinging with my tuned c63. I use 93oct.

[ezatnova]

Originally Posted by crazy1469

so i have been noticing that when i punch it the initial burst will cause my engine to ping...i am using 94 octane so that should eliminate poor fuel, the car is completely stock there should be no reason for it to ping!!!

Is the noise one to three "pings" immediately after flooring it, and also is it subsequent with the transmission downshifting? I've noticed my car do that (only had it for a month, so I'm still learning the noises, etc), when sometimes I hear a metallic clicking noise, especially in a tunnel or next to high walls, when I mash the gas. In the back of my mind, I've thought it sounds sort of like knock, but I've also written it off as a probable mechanical noise of something else the car is doing. Mainly because I only ever use 93.
I am quite sure I've never heard the noise when manually controlling the gears...only when it's left in auto and has to slam down several gears. Maybe that's a test you could do to get more concrete data, if you haven't already. Have the car in M and floor it at various RPMs in various gears.

[6.2AMG]

PLEAAAAAASE HELP!!!!

HELP!! 11' E63 headers & catless pipes - Pinging

[ZephyrAMG]

Lets say it pings and its more of a headache to look into it and all your guesswork wont fix it. Pinging won't do anything unless its valve related or cam related so I am thinking the engine will run fine, you just have to block out the noise...

[crazy1469]

Originally Posted by ezatnova

Is the noise one to three "pings" immediately after flooring it

that is what is happening with me....but it also does it in manual as well

[crazy1469]

Originally Posted by ZephyrAMG

Lets say it pings and its more of a headache to look into it and all your guesswork wont fix it. Pinging won't do anything unless its valve related or cam related so I am thinking the engine will run fine, you just have to block out the noise...

you have it wrong buddy...pinging will do a lot of damage to your engine, normally an engine that is pinging because of timing or fuel issues....if your are not getting enough fuel to the engine you will run too lean meaning your engine will be running at mad temperatures and you will find your self with a massive empty engine bay when it explodes lol...

[ZephyrAMG]

Originally Posted by crazy1469

you have it wrong buddy...pinging will do a lot of damage to your engine, normally an engine that is pinging because of timing or fuel issues....if your are not getting enough fuel to the engine you will run too lean meaning your engine will be running at mad temperatures and you will find your self with a massive empty engine bay when it explodes lol...

I understand the ramifications of letting a destructive pinging go but I't talking about an owner who has already cancelled out all other reasons, uses 93 and up octane and has NO OTHER reason for the engine to ping. I'm taking about pinging on a car with no other obvious abnormalities. Also the O2 sensor would be lighting up if fuel is too lean. Second you will have over heating first and foremost so coolant and temps would alerting you way ahead of time...

[crazy1469]

[QUOTE=ZephyrAMG;5300484Second you will have over heating first and foremost so coolant and temps would alerting you way ahead of time...[/QUOTE]

coolant temp and internal combustion temp are totally different....your vehicle will be running at normal operating temp and your combustion chamber will be melting

[Merc63]

I believe it is nearly impossible for a stock car to ping. You have something called a knock sensor which will retard timing, even if you put 87 octane in it, I doubt you could get it to ping.

Dont you think the merc engineers thought that someone might get trapped on the highway or something where 91 oct wasn't available?? I doubt they said, ahhh screw it if they cant find 91, lets just let the engine detonate itself apart.

[crazy1469]

Originally Posted by Merc63

I believe it is nearly impossible for a stock car to ping. You have something called a knock sensor which will retard timing, even if you put 87 octane in it, I doubt you could get it to ping.

Dont you think the merc engineers thought that someone might get trapped on the highway or something where 91 oct wasn't available?? I doubt they said, ahhh screw it if they cant find 91, lets just let the engine detonate itself apart.

Ohhh you can get a stock car to ping....specially on 87 octane it will sound like fourth of july under your hood.....and yes the knock sensor is the but it only tells the computer to compensate once it detects knock, so in order for it to de tect "knock" pinging it has to ping and then the. Computer will compensate.....but a stock amg engine should never ping unless there is something wrong with it

[Merc63]

The ECU is adjusting timing 1000s of times a second. I doubt you can hear that quickly.

[SonnyakaPig]

Originally Posted by Merc63

I believe it is nearly impossible for a stock car to ping. You have something called a knock sensor which will retard timing, even if you put 87 octane in it, I doubt you could get it to ping.

Dont you think the merc engineers thought that someone might get trapped on the highway or something where 91 oct wasn't available?? I doubt they said, ahhh screw it if they cant find 91, lets just let the engine detonate itself apart.

Stock cars do ping on 91 octane at times, so your theory doesn't hold up.

You should try 87 octane and see how it works out. Report back.