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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

Issue resolved. Mix of bad knock sensor and awful clogged injectors. After cleaning they all flowed 504 statically, before I had one at...

Mar 9, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

Little update: Compression test on all 6 checked out, all even. Replaced knock sensor with a new (used) one, that one seemed to work...

Feb 20, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

I compression tested it and changed the plugs during troubleshooting. Compression was all 100-105 on each cylinder with my cheap china...

Feb 11, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

I don't disagree with you at all, 1 cyl being down doesn't seem like it would cause all of the problem.... but we'll see. As for the...

Feb 11, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

Yessir I believe that is correct. Making "some" headway I think. 1. Checked the knock sensor: AC volts, red lead to sensor wire, black...

Feb 11, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

It's a 1999 3.1L 200hp V200TLRX if that makes any difference. 1- Doesn't limit RPM in neutral (will rev in neutral, and in reverse)...

Feb 10, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

Disconnected the O2 sensor - No change Pulled the injectors and mailed them off this morning to Injector Rehab Re-installed the LP...

Feb 10, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

That's the only thing that makes a lick of sense to me. Exhaust pushing water away from the prop thus decreasing load and allowing it...

Feb 9, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

Less load in reverse than in forward was not something I thought of or considered. Just assumed since the prop was submerged and loaded...

Feb 8, 2026
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rjcamel2355 replied to the thread 99 3.1l ox66 wont rev (what am i not thinking of here).

No sir, I haven't. Im leaning towards a timing/spark issue though. I haven't disconnected the O2, to see if it would rev up (I know...

Feb 8, 2026
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rjcamel2355 posted the thread 99 3.1l ox66 wont rev (what am i not thinking of here) in Yamaha & Suzuki Outboards.

Hey folks, I have a 1999 3.1l 200hp ox66 engine. A little back story, boat ran last year but a little rough, pulled the kids on the tube...

Feb 8, 2026

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