1992 Nautique Electrical issue

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Engine goes to limp mode after 20,000 RPM. Runs fine prior to that. I have disconnected several sensors. this helped but keeps popping up. How many sensors can I disconnect?

Are there any other sensors I can disconnect and still have gages work. Guessing coil pacs may be bad.

email text any suggestions. 

Still on the water all day today.

Kevin 513-602-6000  Kevin@DuffyRealtor.com

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Kevinduffy Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Newbie Joined: September-02-2013 Location: Cincinnati Status: Offline Points: 7	Post Options Post Reply Quote Kevinduffy Report Post Thanks(0) Quote Reply Topic: 1992 Nautique Electrical issue Posted: September-07-2013 at 11:01am
	Engine goes to limp mode after 20,000 RPM. Runs fine prior to that. I have disconnected several sensors. this helped but keeps popping up. How many sensors can I disconnect? Are there any other sensors I can disconnect and still have gages work. Guessing coil pacs may be bad. email text any suggestions. Still on the water all day today. Kevin 513-602-6000 Kevin@DuffyRealtor.com

phatsat67 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6157	Post Options Post Reply Quote phatsat67 Report Post Thanks(0) Quote Reply Posted: September-07-2013 at 11:31am
	Limp mode? Which engine is this?

Kevinduffy Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Newbie Joined: September-02-2013 Location: Cincinnati Status: Offline Points: 7	Post Options Post Reply Quote Kevinduffy Report Post Thanks(0) Quote Reply Posted: September-07-2013 at 12:31pm
	Ford 351 Winchester 220 hp with protec

Bri892001 Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4947	Post Options Post Reply Quote Bri892001 Report Post Thanks(0) Quote Reply Posted: September-07-2013 at 1:25pm
	I believe the only two sensors (well, they are actually switches) that affect limp mode are the oil pressure and the temp. Keep in mind, that there are a separate set of oil and temp for the gauges. The gauge ones are actually sensors.

89Martinique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: September-05-2011 Location: Binghamton Status: Offline Points: 457	Post Options Post Reply Quote 89Martinique Report Post Thanks(0) Quote Reply Posted: September-08-2013 at 11:15am
	Disconnect the two switches and see if that helps. Is this the powerplus or HO Pro Boss motor? Because its either 240hp for Power Plus, or 285HP for HO Pro Boss
	Current Boats: 1992 Supra Comp-TS6M PCM 351w HO Pro Boss Pro-Tec Ignition - Full Composite (no wood stingers!) 1989 (3rd Gen) Correct Craft Martinique B/R PCM 351w Power Plus 1984 E-Scow Keuka Lake,

Kevinduffy Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Newbie Joined: September-02-2013 Location: Cincinnati Status: Offline Points: 7	Post Options Post Reply Quote Kevinduffy Report Post Thanks(0) Quote Reply Posted: September-08-2013 at 2:40pm
	240 HP Do you mean the 2 red switches / buttons behind the coil pacs?

89Martinique Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: September-05-2011 Location: Binghamton Status: Offline Points: 457	Post Options Post Reply Quote 89Martinique Report Post Thanks(0) Quote Reply Posted: September-08-2013 at 6:21pm
	no! Take pics of your motor. There are 2 temp units on the intake manifold and two oil unit above the oil filter. Take a few pics and we can tell you exactly where they are...
	Current Boats: 1992 Supra Comp-TS6M PCM 351w HO Pro Boss Pro-Tec Ignition - Full Composite (no wood stingers!) 1989 (3rd Gen) Correct Craft Martinique B/R PCM 351w Power Plus 1984 E-Scow Keuka Lake,

TRBenj Members Profile Send Private Message Find Members Posts Add to Buddy List Grand Poobah Joined: June-29-2005 Location: NWCT Status: Online Points: 21172	Post Options Post Reply Quote TRBenj Report Post Thanks(0) Quote Reply Posted: September-09-2013 at 10:53am
	There is also a knock sensor, in addition to the temp and oil pressure switches. None of them are connected to the gauges.

desertskier Members Profile Send Private Message Find Members Posts Add to Buddy List Platinum Member Joined: December-19-2006 Location: Az Status: Offline Points: 1115	Post Options Post Reply Quote desertskier Report Post Thanks(0) Quote Reply Posted: September-10-2013 at 3:38pm
	On page 51 of the PCM engine manual in the reference section of this site is the "Engine Wiring Diagram for the 351 Ford Pro-Tec". It is easy to find the switches from this illustration. If disconnecting the switches doesn't cure the problem then there is one other thing you can try before swapping pro-tec parts. If you understand how to use a volt meter then measure the voltage at the 12.5V breaker at the rear of the engine. It is one of the red buttons that you mentioned. Turn your ignition key on but you don't have to start the engine. You should read very close to 12Vdc. If you don't then you are dropping voltage through the dash wiring. There are some pretty simple wiring changes that you could try if this is the case.

1992 Nautique Electrical issue

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