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SERVICE INFORMATION
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Exhaust Back Pressure Fitting
115 – 300 HP 60°/90° V4/V6 MODELS
Exhaust Back Pressure Fitting
A blocked exhaust back pressure fitting can result in difficult starting or other run
quality symptoms.
Use the Data Log feature of Evinrude Diagnostic software to monitor the exhaust
back pressure on an engine that is difficult to start, or runs poorly.
Normally, exhaust back pressure readings are erratic. If the data log shows read-
ings which tend to be linear, check the back pressure sensor.
Remove the fitting and inspect for damage or blockage. Replace if damaged.
Clean or replace the exhaust back pressure fitting if it is blocked. Clean it by
soaking in Engine Tuner. After soaking use an appropriate size pick, or drill bit to
open blocked holes.
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