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Old 11-24-2009, 01:44 PM
Join Date: Dec 2008
Location: California
Posts: 111
Question Clean or not clean

92 300SD How do I know if I need to clean/rebuild my injectors. Is there any syntoms on the performance or is just by mileage rutine maintenance.
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Old 11-24-2009, 03:36 PM
C Sean Watts's Avatar
Join Date: Mar 2006
Location: NC
Posts: 1,318
Best test is...

to take them out and pop test them. Be sure to put in new heat shields when you put them back.
1987 300D (230,000 mi on a #14 head-watching the temp gauge and keeping the ghost in the machine)
Raleigh NC - Home of deep fried sushi!
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Old 11-30-2009, 03:38 AM
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Join Date: May 2008
Posts: 95
If you are having a problem with rough idle, more smoke than normal, "missing" at idle (or low speeds) that's a good sign you need some injector work.

I have a vehicle that had every thing rebuilt (Motor, Trans, Differential) before I purchased it but they reused the old injectors (Makes NO sense at all!) Yellow "rebuild" paint on all the fasteners and on the IP (Which was rebuilt) but nothing on the injectors and nothing on the rebuild sheet.

I started having some pretty bad idling problems. Narrowed it down to the #4 injector. Bought some "good" used injectors off e-bay. Replaced #4 and she ran great...for two months.

I've rebuilt two of the injectors and will be finished with rebuilding the other two this weekend.

Pop-Testing is the way to go, although I've heard from some "old timers" that spray pattern is more important than the actual pressure (assuming injectors are in, or close to spec and close to one another)
1982 240
460,000 miles total
140,000 on Rebuild
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