I have a 1984 190d 2.2l 5-spd with 432xxx miles. I've owned it since 386xxx and been running an 80% WVO/20% diesel blend most of the time.

Every year when winter rolls around it's just a little harder to start, even though I make sure GP system stays up to snuff. Engine never excessively smokes and runs very smoothly with adequate power once warmed up and good economy ~35/40mpg.

Last year, I removed injectors, cleaned bodies, matched pop-off pressures, and replaced visibly worn parts with used spares in better condition. All work was done using a homemade tester, so accuracy wasn't 100%, but it allowed me to get pretty close. Despite working on injectors, starting was exactly the same as before repairs. I decided to leave well enough alone, and continued through the winter with hard starts.

This year, I could barely start it on the first day below 40f (10-20sec cranking time)and realized I wouldn't make it through the winter and ran a compression test. Hot, my pressures were 400, 440, 410, 430. After cooling off, I ran the test again cold at 40f and got 340, 410, 400, 410.

While injectors were out, I confirmed all plugs getting red hot and battery/starter sytem up to snuff.

I know my number 1 hole is a little weak, but these results are pretty good, especially given the high mileage on this engine, right?

I know that running a WVO blend may make my car start a little harder than same car running diesel, but this car used to start well!

What's the concensus opinion out there...will a set of new Bosch injectors restore cold starts to a serviceable level?

Thanks for your thoughts!

Best,
Brad