Date registered: Nov 2003
Vehicle: Mercedes 1979 280ce
Location: Denver, Colorado
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RE: TWEAKING YOUR K JETRONIC
The old K jetronic has been jetting along in my 1978 280e with no real problems for the past 27 years. Recently I became aware that my gas mileage wasn't what it used to be, and I started wondering, is it possible to tweak a Jetronic? Or does this Bosch fuel injection system last forever and ever?
For the recent tune up, I ask the mechanic to check the fuel pressure, and he noted - the operation of the fuel pressure regulator was intermitant / defective. Do these regualtors wear out? If so, is it an easy part to replace? It doesn't cost much for the part. The name fuel regulator implies it's importance shouldn't be ignored.
As far as I know, there has never been much maintenance work done on my Bosch K Jetronic fuel injection system. Do these Jetronic's last forever, or is reasonble to suspect that after 27 years some replacement parts are timely?
After the tune-up, the 110 engine purrs like a kitten although I haven't checked the gas mileage. If it's not too much trouble I was thinking about installing a new fuel pressure regulator. We replaced the fuel pump and main fuel filter a couple of years ago.
I live in Denver at a mile 5,280 feet above sea level, so the air is thinner and presures are reduced at this high altitude, by a factor of 83% (?)and the timing specs change about 11 degrees. Not a computer chip to be found anywhere in a 1978 280e -220,000 miles.