Finally my missfire is done and dusted

Miffy

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CLK 320 CAB Elegance C208
Well, I had some fun and games :( car was reporting a missfire on Cyl 1, swapping coilpacks with number 4 moved the fault, so without checking any further I went down the road of getting a new coil, after all it cant be both HT leads can it?

MB wanted £140, rang around and got sent a part from Europarts, cost £65 and was delivered next day.

When I went to fit it, the LT plug wouldnt insert all the way, so I took the coil back off, and tried to remove the HT leads, guess what, they wouldnt come out, no amount of tugging moved them, I ended up pulling so hard that the copper ends snapped off and remained stuck inside. The coil has been returned for a refund.

Lynall from mbclub kindly offered to give me two HT leads but as I was now desperate to get my ride on the road, I bought new leads from MB, @ £25 each. And thats all it was all along, two broken HT leads that were most likely damaged when I had the plugs done in its last service (non MB)

well, thanks guys for the assistance, and thanks again Lynall
 

television

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2002 SL500, 216 CL500, all fully loaded
Pleased it fixed :D:D
 

busby20

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SLK's 2, CLK320 Cabriolet.
Well, I had some fun and games :( car was reporting a missfire on Cyl 1, swapping coilpacks with number 4 moved the fault, so without checking any further I went down the road of getting a new coil, after all it cant be both HT leads can it?

MB wanted £140, rang around and got sent a part from Europarts, cost £65 and was delivered next day.

When I went to fit it, the LT plug wouldnt insert all the way, so I took the coil back off, and tried to remove the HT leads, guess what, they wouldnt come out, no amount of tugging moved them, I ended up pulling so hard that the copper ends snapped off and remained stuck inside. The coil has been returned for a refund.

Lynall from mbclub kindly offered to give me two HT leads but as I was now desperate to get my ride on the road, I bought new leads from MB, @ £25 each. And thats all it was all along, two broken HT leads that were most likely damaged when I had the plugs done in its last service (non MB)

well, thanks guys for the assistance, and thanks again Lynall
Had a misfire and lack of power on my CLK320 and on checking the diagnostic programme on my laptop it showed a fault in voltage at coil/s - there are 6 on the 320 -which on e-bay were £65 a piece! I toyed with the idea of getting 1 or maybe 2. but decided in the end to go the cheaper route - £38 for a complete replacement set of HT leads, and although it was a fiddly time consuming job removing and fitting 12 (yes 12!) leads, it completly cured the problem and car is now running faultlessly:lol: so, it pays to start with the cheapest solution and work upwards and maybe get lucky and save a few quid.;)
 
OP
Miffy

Miffy

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CLK 320 CAB Elegance C208
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what diag system was that you used? I used a odbII scanner but that didnt show any coil info and where did u get a full set of HT leads for 38? I paid 25 each lol
 

busby20

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SLK's 2, CLK320 Cabriolet.
what diag system was that you used? I used a odbII scanner but that didnt show any coil info and where did u get a full set of HT leads for 38? I paid 25 each lol
Use Carplan (Asian copy e-bay) and leads from Vehicle Electrics Online - see link.

http://www.vehicle-electrics-online.com/

Quote from invoice:

Qty Name SKU Price Total
1 MERCEDES CLK 320 W208 Series IGNITION LEAD SET - 3200 LEAD1296-RL575 £32.68 £32.68

Subtotal : £32.68
Shipping : £2.89
Tax Total : £4.64
Total: £35.57

Actually cheaper than I remembered.:Oops:
 

Top Cat

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(97) W202 C230 Elegance Estate
And thats all it was all along, two broken HT leads that were most likely damaged when I had the plugs done in its last service (non MB)


We've had this on two seperate cars in the past year or so - the old leads functioned well up until the point they were moved aside to change the spark plugs. I'm guessing that they had become hardened and brittle towards the plug end, and removal caused them to break up internally.
 
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Miffy

Miffy

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they didnt feel hardened, but its very clever how the merc noticed the drop in spark and shut the cylinder down. saves the cat from certain death
 

Hertfordshire Merx

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Unfortunately this is a common fault on Mercedes Vee engines, the leads break down or the metal flash guards on them track out on the cylinder head.
 

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