Today I did something new: set the injection pump timing on my E300 using the millivolt method. My goal is to improve fuel consumption.
The glow-plugs will produce a very small voltage when heated, due to the dissimilar metals used to make them. Measuring this voltage (~12 to 13 millivolts in my case) provides a clue as to the heat of combustion in the pre-chamber. Previously I'd set the IP timing using the locking tool, which I consider to be a rather imprecise way of setting the timing. I made a harness to tie the glow plug wires together at the connector for the pre-glow relay, so I was combining all the voltages. This produced a very steady signal, measured with my Fluke DMM. I found that by retarding the timing, not only did the idle speed increase, but so did the heat of combustion. The voltage peaked after three complete clock-wise wrench revolutions , but if I continued retarding the timing, the idle speed continued to increase. Going for a test drive shortly. Will know if the fuel consumption has improved after a few hundred miles or so. Thanks, /s/ Max Dillon Charleston SC _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
