CLK 208 320 conv engine problems

Joined
Jul 12, 2012
Messages
34
Location
Great bentley Colchester way
Car
11 ml350 sport, clk320 convertible 51, tvr chimaera, Yamaha 1300xjr
So here we go, Im fairly good with spanners etc and have OBD reader etc
Not had time to do lots of diagnostic/logic to this and hoping someone will save me lots of time and point me to most likely(please god).
51plate 70k 320 in very good condition FSH etc.
Cant use reader as no interface, convertor cable doesnt work so sure codes are in there but no access. No known merc specialists in reasonable Colchester area.
Have strange misfire problems that are getting worse.
Latest is complete cylinder failure and engine check light on.
Start of journey all fine, typically early in journey floor throttle, loss of power and check light, engine sound/feel suggests loss of a cylinder. All else fine in car.
Get car home, leave overnight, starts fine on all cylinders, engine light still on, no malfunction displayed. 2 cycles later, engine light goes out.
Guessing fault happens, resets, 3 cycles later ECU decides no engine fault.
This has now happened twice over period of a week
Car always has slight tappet sound at early startup but goes in seconds.
It has always been a bit lumpy at idle but pulls fine in all ways.
Replaced plugs, cleaned MAF(big difference!), air filter new, oil and filter just replaced(mobil1).
Thought of coil pack, if so, how do they go? slight miss might be 1 plug on cylinder going and then when hot? second breaking down to a no fire to cylinder situation? Last time this happened was when coming out of works car park so running for around 3 mins only(hot?)
Thought also tappet not actuating valve properly to extent of non combustion but repumps on restart?
All other forum reads might say MAF but why just 1 cylinder?
Help, where would you start?
 

jaymanek

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Lots of Mercedes!
I would also say you need to replace the MAF with a decent brand one...

However there is no substitute for paying a few £ to someone with a star machine to properly diagnose.

Not much else goes wrong with that engine.
 
OP
OP
A
Joined
Jul 12, 2012
Messages
34
Location
Great bentley Colchester way
Car
11 ml350 sport, clk320 convertible 51, tvr chimaera, Yamaha 1300xjr
Good quality MAF replaced and car feels much smoother but still has rough tickover.
Ive bought a Carsoft MB kit for diags but software instal causing problems.
Error codes in German! Ebay special!
 
OP
OP
A
Joined
Jul 12, 2012
Messages
34
Location
Great bentley Colchester way
Car
11 ml350 sport, clk320 convertible 51, tvr chimaera, Yamaha 1300xjr
Carsoft all now looking good. A great piece of diagnostic software certainly for my 208 320. Told me a misfire on cylinder 5.
Already replaced plugs, replaced the plug leads(used from ebay) and swapped coil packs between 4 and 5 at same time. Gave everything a blast of wd40 and car now running perfectly. Reset codes using Carsoft. Been good for a couple of days of use.
Found along the way that early coil packs 73003 although looking physically identical dont fit my 51 plate car 78003 as the engine harness connectors have different pins. Now got 2 spare used 73003 coil packs!
 
OP
OP
A
Joined
Jul 12, 2012
Messages
34
Location
Great bentley Colchester way
Car
11 ml350 sport, clk320 convertible 51, tvr chimaera, Yamaha 1300xjr
Spoke to soon
Floored throttle on way home
Was getting code on cylinder 5
Now getting p2052 misfire on 2 or 5 kat harmful p0302 which seems to have moved to cylinder 2
Engine check light on
As before maf replaced. Plugs replaced
Seemed when it happened one cylinder shut down as car down on power and rough
Switched off and on when home and engine back to normal

Help any clues where to next
 

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