Fuel Rail Electrical/Fuel Determination - Mercury 150 EFI Service Manual

Fuel Rail Electrical/Fuel Determination

No RPM change on cylinder(s),
indicating problem in cylinder(s).
Perform Fuel Injector load test.
Results
Fuel Injector has audible click.
Injector is functioning properly
Perform Ignition Coil load test.
Results
Weak or no ignition spark
Replace defective coil, spark plug
or wiring
90-883728 JULY 2001
Perform all preliminary checks page 3B-11.
Adequate fuel pressure (41 to 45 psi; 283 to
310 kPa) follow Low/High Fuel Route Flow
Charts.
Run engine @ idle and with DDT, perform
cylinder load test.
Results
Fuel Injector does not have audible click.
Defective injector or broken cir-
Perform Induction Manifold
Disassembly and inspection.
Results
Low or no compression on cylinder.
Inspect cylinder bore. Refer to
Section 4 for disassembly.
NOTE: Injector filters must be
inspected prior to reassembly.
RPM decreases (on each cylinder).
Results
cuit to injector.
Results
Ignition spark OK
Perform compression check on
problem cylinder.
FUEL INJECTION
Results
Fuel delivery OK.
Results
Compression OK.
Check:
1) Damaged reeds
2) End cap seals
3) Crankcase split line leak
4) Crankshaft sealing rings
Page 3B-19