SL65MONSTA

i dont seem to understand this thread , people are blowing IGN modules/ Voltage transformers but are replacing them with the same part numbers, wouldn't it just blow again if you did not replace it with the updated part number? also what is the updated part number for this ? I have a 2004 SL65 and recently uploaded a tune to my car, I think it blew my module, if I put the same module back into my car wouldn't it just blow it again? or do I need a module that is updated to handle the new tune ?

abiazis

In 7 years I have had 2 coils blow (left one and right one) 20 K miles apart ( car has 60K on it now) and the ignition module went after one of the coils or vice versa.... with all the information on these threads about this it seems that coils were upgraded back in 2007 and transformer or ignition module ( $ 900.00 - $ 1K) is the same part which doesn't go as often but seems that its failure can effect a coil to also go when it goes.....if this make sense......

SL65MONSTA

How do you know that the IGN module can affect the coils? also how did you diagnose that it was a bad IGN module or coil ?

Welwynnick

Its difficult to diagnose an ignition module fault, as they have the same symptoms as coil pack faults. The common answer seems to be trial and error. If you have misfires on cylinders 1-6, or 7-12, then its PROBABLY a RHS or LHS coil pack fault respectively. If its randomly all cylinders, its PROBABLY the ignition module - as long as you've eliminated other systematic defects like lambda, pressure and temperature sensors etc. Its not a hard and fast rule though, and there are plenty of exceptions.

abiazis

when they first diagnosed iit they missed the ignition module being bad....they replaced plugs, coil and misfire problem came back within a week....replaced ignition module and all okay...then the other coil went after 20k replaced it and all okay....that was the sequence...40 k to 55 k miles...

SL65MONSTA

wow one would think that there would be a way to diagnose such expensive parts without just having to trial and error.

SL65MONSTA

Is there a way to "eliminate" the sensors? it would be much easier and cost less, instead of replacing $5000 worth of electrics just to find out it was something so minor. Initially the errors were on both banks , and then changed codes on different cylinders every time I turned the car of and back on again which pointed to the IGN, but after clearing the codes and driving it , the whole left side bank was on errors P0301-P0306 +P0300 , I have opened one of the coil packs and all seems to be in tact, you mentioned previously its the longitudinal solder that sometimes comes apart, is that on the other side of the board of the components?
Thanks guys for helping with the input and feedback much appreciated, this forum is so valuable in terms of knowledge about these cars

abiazis

I went to Indy first then to dealer....I actually found a dealer in Asheville NC that does great work....I actually can notice my car running smoother after they get done with it....there still is trial and error with electrical stuff unfortunately....car is sorted out now with 2 new updated coils, new plugs, new transformer, etc...can't wait for my next rotor replacements.....)

Welwynnick

Yes, just fit new sensors. They're cheap, and if you didn't to need to fit new ones today, you'd need them next year anyway. They get baked in the heat and fracture easily.

SL65MONSTA

which sensors are we referring to? I know each 02 sensor is about $250 is it even worth throwing out $500 plus, or are we talking about different sensors ?

Welwynnick

No need to go to Mercedes for sensors. They're all the same, and you can get cheap ones for a small fraction of that. They'll be fine. Just make sure to get four wire rather than three wire.

abiazis

good info...Welwynnick...

biker349

great info on the o2 sensors. thanks.

Dr Matt

We need to give welwynnik his own forum called "Just ask W". Lol. You sir (I shall call you W from now on) are full of awesome support for the members of this website. Thank you.

O2 sensors, like you said,area common maintenance item on all OBD2 cars, but clearly a lot of people miss out on this by not keeping their stuff long enough to learn this. I personally appreciate all the wisdom you share here.

SL65MONSTA

I think there still ridiculously expensive over in Australia are they actually an item that does go at a certain milage?

Welwynnick

Why, thank you Matt!

I think I did indulge myself in the threads in my signature.

Nick

Welwynnick

Best way to find those sorts of parts is to look at the manufacturers on-line catalogues, enter your vehicle details, then search for their part numbers.

Try searching Google, Amazon and ebay for:

Bosch 0258006473
http://www.bosch-automotive-catalog....3FautoLoad%3D1

Delphi ES20312-12B1
http://www.delphicat.com/WebForms/fr...#1455631850986

Denso DAX-2007
http://www.denso-am.eu/e-catalogue/

Lambda sensors are quite durable, and usually last a high mileage. When they fail, they degrade gradually and react slowly to the rapidly varying air-fuel ratio.

Pressure sensors are more vulnerable to heat and damage. The sensors used on the V12TT are boost sensors rather than MAP sensors, but they're still common as muck, shared with most modern Mercedes.

Nick

SL65MONSTA

which specific sensors should I replace, my car is still of the road its been 3 months and still no resolution , coil pack replaced but still failing, next thing to do is IGN Module / Transformer , then sensors or ECU. Not sure which sensors to replace "Nick", and where are they located, as well as any part numbers ??

jkm5022

Monsta, do the ignition transformer. I have been following your posts and have the exact same issues as you, including EC tune. it was the transformer, takes 10 minutes and costs 700-900 US depending where you get it. I also mistakenly changed a coil pack with same results

SL65MONSTA

man if i had a dollar for every persons suggestions. Here is what people say to do lol , but Im going with the IGN transformer too thanks

boost pressure control valve
map sensor, voltage regulator
techron injector cleaner , 02 sensors,
injector overhaul, crank position sensor, , carbon build up,air pressure sensors (one on both air boxes and one above the manifold by the intercooler). Also the downstream air intake sensor in the manifold!



* Camshaft position sensor.
* Crankshaft position sensor.
* Change-over valve.
* Intake manifold.
* Left charged air cooler.
* Temperature sensor, charged air line.

SL65MONSTA

i agree to that very much , good one