Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 61Get this manual

Mercury Mariner 200, 225 Optimax Outboards Service Manual, 90-855348, Page 61

1997 OFI Troubleshooting Guide (continued) Symptom 4Engine idles fast (RPM 700) or surges Cause 4.1 TPS sensor malfunction See 2.5 Action
4.2 Broken fuel pressure regulator or tracker diaphragm4.3 Fuel leak

Measure fuel pressureRemove and inspect diaphragmsCheck for fuel entering induction manifold or air compressor inletFuel pump diaphragm leakingSee 3.2

5Engine runs rough below 3000 rpm

5.1 Fouled spark plug

5.2 Low air pressure in rail 5.3 Throttles misadjusted

See 1.2 Check throttle cam setup on induction manifoldInspect linkage and rollerIf throttle plate stop screws have been tampered with, contact Mercury Marine Service Department for correct adjustment proceduresSee 2.5 See 3.2

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