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Old 02-05-2006, 01:30 PM
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Join Date: Jan 2005
Location: Jacksonville, FL
Posts: 73
Smile 92 300E Fuel Injectors Troubleshooting

Own a 1992 300E(125,000 miles) w/M103 SOHC engine. Recently replaced all six fuel injectors along with new injector seals. Engine starts up rough after a day or so without starting and smooths out after a few seconds. Runs smooth during normal driving and after restarts throughout the day. Suspect that one or more of the new injectors is not quite closing off at shutdown and a slow leakdown is taking place overnight or over a few days when car is not started/driven. Is there a simple/easy way to check the injectors individually to see which injector/injectors are leaking down without taking the injectors out and having them tested? THANKS!!!!!
Gilles Kay

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Old 02-05-2006, 01:50 PM
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Join Date: Feb 2003
Location: Ontario, Canada
Posts: 3,160
Normally the first test ( if injector leak-down is suspected ), is to install a pressure gauge at the fuelrail, note the pressure upon shut-down & then look at it before starting the engine the next morning.
Once leak-down has been established for sure, then is the time to isolate the offending injector.
2007 C 230 Sport.
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Old 02-05-2006, 02:05 PM
dkveuro's Avatar
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Join Date: Jun 2003
Location: Here an' there.
Posts: 2,548
Some injectors have been sitting on the shelf for many years and have hardened anti-rust wax in/on them...may take a few more miles to wash this out of the tips. Try running a bottle of Techron in the tank.

Failing that, you'll need to have them bench tested.

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"A liberal is someone who feels they owe a great debt to their fellow man, which debt he proposes to pay off with your money."
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Old 02-05-2006, 02:22 PM
Join Date: Mar 2000
Location: Gainesville FL
Posts: 6,844
An experienced view of the firing line on a scope pattern will ID the missing cylinder. Maybe an infrared gun on the exhaust manifold would reveal it if it happens long enough. Start the car, shut it down when the misfire goes away, measure.

Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician
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