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Oh Boy, got out the disc to double check my suspicions, and I am all wet, it is a crank position sensor, not a TDC sensor, and it's in the bell housing. Assuming it is a 86 or newer 560SL, sometimes people will put a newer/bigger engine badge on the trunk, so be careful as far as what the car really is. Since he is indicating the sensor is on the bellhousing, I think it's safe to assume it's a 560.
On the coil, the typical problem I've seen is they break down (short out) at high temps, the insulation inside turns to goo and the engine runs like crahp once it's hot under the hood. High or low rpms, runs really poor, need to scope the ignition to see it, but in the past I've always managed to come up with a "test coil" to see if it fixes it or not.
Gilly
PS If I would have been correct about the engine having a TDC sensor running off the harmonic balancer, the reason it would screw up the timing is the same as if the flywheel would have been installed 1 bolt off, the harmonic balancer has a small magnetic "plug" installed in the edge of it, and this is what the tdc sensor senses. If the harmonic balancer had slipped, or the sensor changed position for any reason, the timing is directly affected. The harmonic balancer is on the crankshaft with a woodruff key to index it to the crankshaft. You can actually buy woodruff keys with offsets to change the ignition timing. I think mainly Hans has to decide if he's got a timing problem (or other ignition problem) or a mixture problem. It should be easy to determine if the timing is correct or not. No offense intended.
PPS If Hans has a 560SEC, have him try swapping the coil over to the SL as a test!
Last edited by Gilly; 10-15-2004 at 09:43 AM.
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