A couple of days ago I installed an IP that I pulled from the junkyard. When it finally fired up after lots of priming, the engine idled nicely at a little over 700 RPM. After taking the car on a quick spin the idle bumped up close to 850 and the engine was idling a little rougher, but not bad. At this time there were leaks at all of the injector lines both at the pump and the injectors because the pump was now in a slightly more advance position than before. I loosened the front 3 bolts on the pump and let the pump slip out just a touch so that the injector lines would line up. The timing marks on the pump and head are now lined up as well. All injector lines are leak free except #3 cylinder at the injector.

I now have a really rough idle at 850 RPM. When the car has been sitting for over 6 hours, the engine will fire up strong right off of the first bump, but a cylinder misses several times before everything clears up. Is it possible that there is still air in the pump that hasn't bled out? Could the small leak at injector #3 be the problem? Can I apply heat to #3 injector line and bend it a little to help it line up and eliminate the leak?

Also, there is almost no visible smoke in the headlights of cars behind me when I floor it and the power is a little less but close to what I had with the old IP. Thanks

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'81 300SD

If diesel can leak out, air can leak in.

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Current stable:
1995 E320 149K (Nancy)
1983 500SL 120K (SLoL)

Black Sheep:
1985 524TD 167K (TotalDumpster™)

Gone but not forgotten:
1986 300SDL (RIP)
1991 350SD
1991 560SEL
1990 560SEL
1986 500SEL Euro (Rusted to nothing at 47K!)

Sounds like a dead glow plug.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Yeah, I should get that leak at the injector fixed before looking elsewhere. Is there a method for bending the lines?

When a glow plug goes dead on this engine it takes several cranks to turn over and then runs rough for about 5 seconds, so I've ruled that out.

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'81 300SD