2000 S430, 2003 S430, 2000 S500, 2003 S600 TT, and 2005 E320 CDI
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5,336 Posts
Hi folks,
The S600 TT is a very smooth engine...until I drive it "enthusiastically" a bit and things get warm under the hood. Then, one of the cylinders starts misfiring, and I get a CEL. STAR Diagnostics says it's Cylinder #12. So, I went through all the injectors with the DAS tester, deactivating each one and turning it back on with the engine running. All 12 fuel injectors seem to be working fine.
When the engine cools down, that #12 cylinder starts firing again. As long as I don't drive too "enthusiastically" and thus keep the under-hood temperature somewhat down, that cylinder doesn't start misfiring; engine purrs smoothly like a V-12 should.
My old electronics-tech instincts tell me, "hmm...transistors in the ignition coil pack...lots of heat...recipe for eventual failure."
I will certainly replace the spark plugs, using iridium types, hoping that will solve the problem. But I kinda doubt it in this case because of the apparent temperature effect, so I kinda suspect it'll be the ignition coils.
Should that prove to be the case....
Does anyone have experience with these "rebuilt" or "remanufactured" V-12 ignition coil packs from the likes of V12ICPack, Direct Wholesale FL (the eBay seller), and such? What is your experience on a rebuilt coil pack vs. a brand new one? I have looked in the Encyclopedia (didn't see anything), and on MBWorld (mixed reviews).
Thanks!
The S600 TT is a very smooth engine...until I drive it "enthusiastically" a bit and things get warm under the hood. Then, one of the cylinders starts misfiring, and I get a CEL. STAR Diagnostics says it's Cylinder #12. So, I went through all the injectors with the DAS tester, deactivating each one and turning it back on with the engine running. All 12 fuel injectors seem to be working fine.
When the engine cools down, that #12 cylinder starts firing again. As long as I don't drive too "enthusiastically" and thus keep the under-hood temperature somewhat down, that cylinder doesn't start misfiring; engine purrs smoothly like a V-12 should.
My old electronics-tech instincts tell me, "hmm...transistors in the ignition coil pack...lots of heat...recipe for eventual failure."
I will certainly replace the spark plugs, using iridium types, hoping that will solve the problem. But I kinda doubt it in this case because of the apparent temperature effect, so I kinda suspect it'll be the ignition coils.
Should that prove to be the case....
Does anyone have experience with these "rebuilt" or "remanufactured" V-12 ignition coil packs from the likes of V12ICPack, Direct Wholesale FL (the eBay seller), and such? What is your experience on a rebuilt coil pack vs. a brand new one? I have looked in the Encyclopedia (didn't see anything), and on MBWorld (mixed reviews).
Thanks!