T9ja

Just as the title says. After changing all 16 plugs to NGK iridium, took the car out for a drive, drove good. Next day, i drove the car and the car was not making any power. Could not hear the whin of the s/c. Inspected all wires to the plugs, two of the coil wires were slightly off from the plugs. Pushed them back in and went for another drive, and it was still the same deal. No power..

I have checked all plugs again to make sure they are properly tightened and wires placed correctly, but no lock.

FeelThePower

I would check to make sure the plugs you installed were right ones with the proper gap.

As well if your plug boots were the rubber kind compared to the metal, make sure none of them broke or cracked inside boot. It's easy to break them while removing them from the plugs if they've been on there for years beforehand.

Any check engine light?

T9ja

None of them broke. I just gapped it to 0.8mm, but still the same. What kind of plugs came with the car stock? One of the gasket that goes inside the collector pipe is missing, so there's a gap between one of the runners and the collector pipe about an inch, so I don't know if this could cause the loss of power.

FeelThePower

Check the part number with search.. -

https://mbworld.org/forums/w211-amg/...ne-thread.html

any CEL?

sexyxe

It seems you may be chasing thbe wrong issue.

You wrote that you no longer get your sc whine. Bad plugs won't stop your sc from engaging. See if you knocked off a vacuum hose from somewhere.

uraberg

You also recently (2 weeks ago) changed your pulley, and had issues with flashing a tune (lost internet connection which caused a bad flash????).

You should give this info in your post. Chances are it is related. Misfires will set a CEL. if you don't have it, then it's not your plugs.

T9ja

That, I did. Could not find any hose unhooked.

T9ja

CEL has been on since I put the headers on. The problem of car not starting have been resolved by the dealer. Was told that a wire was loose.

T9ja

I will try to put back the stock plugs tomorrow, and see if there's any change.

Crissus

Never gap any plugs for europe cars. Never! Mercedes is not a 1950s, 1960s, 1970s, whatever US car.
While this is not the solution to your issue, just dont do it. The Plugs are expensive enough to not waste em with re-gapping.

sexyxe

Even if the WIS says otherwise? Or the plugs aren't gapped evenly? Pretty broad statement to make.

Crissus

Show me the WIS document number
My Friend i am living in germany, born and raised here, i usually know what i'm talking about on German/Mercedes cars.
We dont know here about the US stuff like "re-gapping" a plug. It was never needed here (at least during in my last 30 years) and wont ever be needed. The Gap is set by the plug manufacturer and on many of our Bosch and Beru Plugs packages, they even warn that there should be NO attempt to change the gap or a re-gapping. It should have been thoroughly inspected by the manufacturers QC department already.

sexyxe

My question was related to if gaps are required at .8mm or .9, 1.0, .75mm etc, but the spec sheet says otherwise, then what would you choose?

uraberg

If the CEL is on, why not mention it, and post the code(s)? You're assuming that since it has been on, that the only code it gives is related to the exhaust. You can now have multiple codes. (Or you can exclude misfires, by not getting a code for it.)

It is a trend here on this board to ask members for technical support, and only give them half of the information. It is baffling to me how anyone can expect to get issues properly diagnosed.

Keep in mind, we're all amateur mechanics at best, with just about enough tools to be dangerous.

With that being said, it is my amateur's opinion, that going back to stock plugs without first reading the codes, or posting which plug exactly you switched to is not the most efficient way of trouble shooting, but it is your time to waste i guess.

T9ja

So it shouldn't be gapped. Mix messages at times creates more confusion. This is the first time I will hear that.

T9ja

You will not always mention everything that have gone wrong with the car because you might consider it irrelevant. You post a message, people ask questions, you answer, then what you consider irrelevant might be relevant at the time. But I will try to fix the headers, then see if that's the problem. That 1 inch gap around the pipe might have been the problem.

layzie12g

Please post the plug part number you used.

Shiaohoo

Did I read that right, 16 plugs?

T9ja

LFR6AIX-116619

T9ja

Yeah. The w211 E55 uses 2 plugs per cylinder.

Shiaohoo

I had no idea that they used 2 plugs per cylinder.

cnterline

If you still have old plugs put them back in and see if problem goes away ,if they are different numbers then the ones you just put in ,at least that will help isolate a spark plug problem

T9ja

Put the old ones in, problem remains. Pulled these codes though. P0136, P0161, P0412, P0458, P0448, P0135. Any ideas?