Vegas Naturist
Petty Officer 3rd Class
- Joined
- Sep 15, 2011
- Messages
- 81
Okay, this is strange... Background information, we're working on a 1997 3.0 LX serial number 0K179178. My boat was running good but stumbled on hard acceleration. Smooth acceleration was fine. I attributed this to a worn accelerator pump. I had the carb rebuilt by a marine shop here in town, and also asked him to check the tune. The boat sat unused since then (October) after the carb rebuild. It had less than a quarter tank of fuel. Earlier this month, we filled the boat (20ga fresh fuel added to about 8 ga then fresh fuel put in in September. We took the boat to the lake and it was very hard starting, ran very rough, wouldn't idle. I'm in the process of troubleshooting the issue. I have not contacted the marine mechanic who worked on the boat.
First thing I checked was ignition timing. I found the timing set at about 14 BTDC. I jumpered the two white wires to put it in base timing mode, so I could check base timing (spec is 1 BTDC). The timing didn't change. I checked all the wiring per the wiring diagram to be sure nothing was disconnected, corroded, etc. All seems okay. Checked again, timing did not change. This suggested the ignition module is defective. In truth, it is the original module, We're the original owners of the boat. I ordered a new module and pickup coil, module Sierra PN 18-5107-1 (maybe I should have bought OEM, but...) and coil Sierra PN 18-5108 from I-Boats. I installed both and reinstalled the distributor. Same problem! Jumping the two white wires and setting the base timing to 1 BTDC, disconnect the jumpers, timing stays at 1 BTDC. It still does not advance to 10 - 14 BTDC like it's supposed to. What am I missing? While possible, I have a hard time believing that both the old and new module are defective, with the same symptom. Any ideas?
John
First thing I checked was ignition timing. I found the timing set at about 14 BTDC. I jumpered the two white wires to put it in base timing mode, so I could check base timing (spec is 1 BTDC). The timing didn't change. I checked all the wiring per the wiring diagram to be sure nothing was disconnected, corroded, etc. All seems okay. Checked again, timing did not change. This suggested the ignition module is defective. In truth, it is the original module, We're the original owners of the boat. I ordered a new module and pickup coil, module Sierra PN 18-5107-1 (maybe I should have bought OEM, but...) and coil Sierra PN 18-5108 from I-Boats. I installed both and reinstalled the distributor. Same problem! Jumping the two white wires and setting the base timing to 1 BTDC, disconnect the jumpers, timing stays at 1 BTDC. It still does not advance to 10 - 14 BTDC like it's supposed to. What am I missing? While possible, I have a hard time believing that both the old and new module are defective, with the same symptom. Any ideas?
John
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