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Sheron Norsworthy
Is your Mercedes V12 running on less than 12cylinders ? Disgusted with the idea of spending $1,400 for a new coil pack? Finally, a cost effective solution exists to get your V12 back to 100% ! We've all been told theignition control module is a sealed unit, a black box with no serviceable parts inside. I have had my S600 for over ten years and suddenly the car lost power, performance and driveability. I've combined my 25 years of electronic manufacturing experience in Silicon Valley with my dysfunctional Mercedes S600. The result was a cost effective solution that I want to share withthe world !
At V12icpack we can replace the coils andMOSFET transistors controlling a single cylinder for as little as $275 or rebuild your module for as little as $699. No longer do you need to put off getting your V12 Mercedes running like itshould - a 12 cylinder beast !
Our technicians are highly trained electronics professionals. We have the tools, knowledge and equipment to test and repair your ignition coil module. Allmodules will be tested before work begins to ensure which cylinders are misfiring. Unfortunately, no two coil packs ever seem be the same failure mode. From an engineering standpoint, wehave been able to identify critical components within the printed circuit board's circuitry. From this critical standpoint we are able to pinpoint defetive MOSFET transistors, diodes, capacitors andzener diodes that have rendered your coil pack useless. The ability to pinpoint failed components is what sets us apart.
Its a horrible feeling when the check engine light comes on your dash. If you have engine misfires the first code that typically comes up is P0300. This is a generic failure code simplyindicating, at a summary level, that there is a misfire. From there, the reader, for example will indicate P0302 and P0304. The last two digits correspond to the cylinder number, so inthis case, the 02 and 04 correspond to cylinders 2 and 4. When sitting in the car, the left side is the drivers side (except for the UK - where the left side is still the left side but not thedrivers side) and the right side is the passenger side. The passenger or right side of the engine are cylinders 1-6 and the left side, or driver's side are cylinders 7-12. If you don'tknow when the spark plugs were last replaced, change the spark plugs with the direct OEM replacements (see below) and see if the misfires go away. Generally, new plugs will cause 50% of themisfires to go away. The car will still run horribly with just one cylinder misfiring so you're now going to have to deal with the coil pack.
We do not recommend fixing or repairing just one or two cylinders. It won't hurt anything to do a partial repair but the likelyhood of other cylinders misfiring in the very near future isvery high. The cost of double shipping and double labor will prove to be very costly. The exception to this would be physical damage to the pack when it was working perfectly (having acoil break out when pulling out the coil pack, accidently dropping or stepping on it while changing the plugs). If your getting failure codes on all six cylinders from one side it may not beyour coil pack........ the OBD readers/codes cannot tell a coil pack failure from a Voltage Transformer/Ignition Control Unit failure. The voltage transformer/ignition control unit is a multilevel output voltage transformer unit converting 12 volts to 23v and 180v. In simple terms you can think of it as a power supply for the coil packs. The unit is literally built in two exacthalves that make up the whole unit. Each half controls the power output to one coil pack. A defective VT/ICU generally kills an entire pack (cylinders 1-6 or 7-12) and maybe 2% of thetime can effect a single cylinder. The VT/ICU is located on top of the engine, in the middle, towards the front of the car
Because it is nearly impossible to tell a coil pack failure and a VT/ICU failure we offer both of these units as rental/test assemblies. If the rental unit resolves your problem you canleave it in your car and purchase it. If it does not fix your problem, simply return it and pay the very reasonable rental fee. All coil packs used for rental purposes are completelyrebuilt, as new units and carry a one year unlimited miles warranty. The VT/ICU's have all been upgraded with higher temperature rated components and also carry a 1 year unlimited mileswarranty
Watch this video to get an understanding of what's going on out in the market place. I show how the coil packs work as well as define why the packs fail andintroduce our coil that is being produced in our own joint venture captive manufacturing facility.
The ignition coil pack video below shows what's involved in removing the module from an S600. It also goes into some detail about what is inside the module. Hopefully, by seeing what'sinside, you'll be in a position to decide if this is a task your skills will or will not allow you to accomplish. If you're going to send your module in for repairs, please don't try to open upthe cover and risk damaging it. We are unable to get replacements.
This video goes through some scenarios that may help you identify or eliminate potential issues. If you are experiencing specific misfires on less than one entire bank i.e., fewer than sixcylinders, you cannot necessarily rule out a voltage transformer failure but it is highly unlikey. If you don't know when the spark plugs were changed last or it has been more than 30,000 miles,start your diagnosis by replacing all the spark plugs (or at a minimum those cylinders showing a misfire). Normally aspirated V12's call out a double platinum plug (platinum center electrodeand platinum ground electrode) but twin turbo V12's must use iridium plugs. Iridium is a harder element than platinum and holds up better and takes less energy to fire under the higher boostpressure of the TT's. Double platinum plugs with a standard diameter core in a turbo V12 may cause the ignition coils and possibly the voltage transformer to fail. Worn spark plugs, plugs with toolarge of an air gap (center electrode to ground electrode) will cause the ignition coils to fail - the question is whether or not the failure is permanent or not. You can use iridium plugs withall V12's they cost a bit more though. Do your homework on the plugs you want/need. Some plugs are rated with a service life of only 30,000 miles. Others go up to 120,000 miles. After replacing the spark plugs inspect the spark plug boots (see Youtube video below) and reinstall the coil pack. Reset your engine codes, restart the engine and see if your situationhas improved (you'll probably have to drive it to put a load on the engine). If you call your local MBz dealer, or go on line with your VIN you can get your engine model number which willcall out the MBz spark plug part number for your vehicle. From there you'll have to cross from the MBz part number to the OEM. For example, a 2001 S600 that has engine 137.970 uses a MBzspark plug p/n 004-159-07-03 which was made for Mercedes by Beru with their spark plug 14F-7DPURX2. From there you can cross to other manufacturers and see what's available. In this case, itcrosses to a Bosch FR7KPP33U. The twin turbo models from 2003 -2016 all used NGK brand spark plugs as the OEM plugs. They are iridium plugs and the NGK number is 1FR6Q.
When the electrode wear increases, the resistance in the spark gap increases causing the current to go down. Excess voltage cannot develop in this circuit due to the drop in current. Additionally, the voltage transformer is voltage limited, in terms of voltage output. Most coil failures we see are due to a high resistance and not shorting out. In essence, overtime, these coils are subject to heat, electricity and vibration. Any tiny resistance will eventually become a larger resistance. The higher the resistance, the more power the coildissipates in the form of heat (P=I*I*R). this problem cascades until the coil completely burns out (goes open/infinite resistance). When someone replaces their old plugs, more currentflows across the arc gap because there is no longer as much resistance. When that larger current flow goes through an old, worn coil even more heat is dissipated - damaging the coil evenfurther. Same with a performance tune, the increased spark duration (more current run time), which will result in burning up the old coil even faster. Old plugs will make your coils lastlonger, but your performance will suffer - right to the point of spark plug or coil failure. For these reasons, it is not uncommon for a coil pack to experience more cylinders reading a misfireafter changing the spark plugs or after a performance tune is downloaded into the ECU.
As shown in the failed coil video below we are also see a failure in the plastic tube housing. The secondary coil is putting out more than 60,000 volts and the plastic tube (inside the metaltube) is the insulator. We've seen multiple coils develop a small crack in the plastic and of course its arcs/grounds out on the metal tube. This type of failure will definitely trigger amisfire code. The misfire code is the end final result of what has transpired through the ignition cycle. There are lots of variables and possibilities of what can go wrong...... A short toground through the coil can ruin several components on the printed circuit board. The MOSFET transistors on the coil packs act as electronic switches turning the spark plugs on and off. They can handle up to 1,700 volts at 4 amps which is pretty considerable considering their small size. Each spark plug has its on controlling MOSFET. There is a secondary set ofMOSFET's and these act as master switches for both the A and B channels of the ignition circuit and work in pairs on three cylinders (1-3, 4-6, 7-9 and 10-12). These parts can fail by simplybecoming dysfunctional. They can also fail from getting fried as the result of a direct short at the coils which will draw too much power from the VT/ICU. The VT/ICU can generate as muchas 10 amps output which can totally overwhelm the 4 amp capacity of the MOSFET's controlling the ignition coils. Not only can this power surge destroy the MOSFET transistors but will also blow outdiodes and zener diodes that are in the ignition circuit. This is why its so important that the people rebuilding your coil pack clearly understand what's involved in troubleshooting and resolvingall of your pack's potential problems.
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