| Author |
Message |
    
Bryan Dolnik
Member
Username: bdolnik
Post Number: 17
Registered: 07-2007
| | Posted on Monday, September 28, 2009 - 01:15 pm: | 
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Just when I thought I was getting things figured out the following happened this weekend. Ran about 20 minutes South to get gas... everything seemed fine, temps ok, boat ran well. Took on 25 gallons in each tank (each tanks holds 125 gallons). After idling back out of marina, powered up for the cruise home and had the port engine drop RPM's just past 2k. Now I've had the RPM limiters kick in before and it affected both engines, and sounded the warning horn and illuminated the check engine lights. This time it only limited the port engine (boat yawed terribly) and did not sound any alarms. Temp showed normal, about the same on both engines.
So I'm completely stumped. Any ideas on what to look at? These are 1996 Crusader 454XL's. I was able to idle home at 1200 RPM on both engines no problem.
It doesn't seem like it would be a fuel problem to me as the cutout was not gradual, it was like a switch going off right past 2000 RPM. |
makomark
Senior Member
Username: makomark
Post Number: 1571
Registered: 09-2008
| | Posted on Monday, September 28, 2009 - 07:22 pm: |
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Did you check the distributor cap for internal arcing?
Do these have ECU's - full computer control or are they the hybrid with the electronic distributor and the carbs? if ECU - scan for codes as sensors are known to fail anytime.
Was it running smooth and just rpm limited or a bit rough? |
Bryan Dolnik
Member
Username: bdolnik
Post Number: 18
Registered: 07-2007
| | Posted on Monday, September 28, 2009 - 08:16 pm: |
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I have not checked the distributor cap, I will once I fix the engine hatch which just decided to stop working 
I believe these are the hybrid, electronic distributor with carbs?
Yes, running very smooth and then just past 2100 RPM an immediate "cut-off" to idle. |
David Denny
Member
Username: dennydl
Post Number: 26
Registered: 03-2008
| | Posted on Tuesday, September 29, 2009 - 11:49 am: |
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Mark,
What scanner do you recommend? Will an automotive scanner do or does it require one specific for Crusader? I have twin 454XLi.
David |
Joe
Member
Username: outriggers
Post Number: 63
Registered: 07-2006
| | Posted on Tuesday, September 29, 2009 - 06:21 pm: |
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Go to the rinda web site.. I think they have what you need. I have the 2007 8.1L and it uses a CAN buss so I had to buy the PC based software which was a lot more.
http://www.rinda.com/marine/marine.htm |
makomark
Senior Member
Username: makomark
Post Number: 1575
Registered: 09-2008
| | Posted on Tuesday, September 29, 2009 - 06:40 pm: |
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David: concur with Joe - RINDA is the leader in this department.
Bryan: the "cut-off to idle" is a bit confusing. Are you saying once your RPM exceeds 2100, something lowers it to idle (+/-)? |
Bryan Dolnik
Member
Username: bdolnik
Post Number: 19
Registered: 07-2007
| | Posted on Tuesday, September 29, 2009 - 07:11 pm: |
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Yes, Mark. Throttle up both engines trying to get on plane and the port engine drops to idle after getting to about 2100RPM. Very similar to a problem I had before when the starboard engine was overheating. Only in that case both engines cut back, and the horn and check engine lights came on. It was also apparent on the temp gauge that something was wrong.
That's what is so confusing about this, no horn or lights, and it's only the port engine that cuts back. Starboard engine continues increasing RPM and boat yaws horribly. Temp gauges are normal on both engines.
I'm at a loss for what to check? |
makomark
Senior Member
Username: makomark
Post Number: 1578
Registered: 09-2008
| | Posted on Tuesday, September 29, 2009 - 08:30 pm: |
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Bryan:
You made me look up some parts....best as I can tell, you have a computer, with the standard suite of sensors but it only controls the spark, not the fuel delivery. That is independent of the computer and done exclusively by the carb.
The previous experience sounds like the computer rev limiter kicked in, as you indicated with the light and the horn. This one is different. I'd start with the basics and concentrate on the non-computer controlled stuff; ie fuel. Could be something as simple as the oil pressure switch controlling the fuel pump is marginal and goes intermittent with the engine vibrations at 2100. I'd hook a test light into that circuit and see what happens at 2100. If that's ok, check fuel pressure at the carb.
Could also be a sensor giving a bad reading, but not far enough off to set a code. The drawing of that ECU leads me to believe it is NOT a MEFI-1 based system, so this maybe a very crusader specific issue. |
Bryan Dolnik
Member
Username: bdolnik
Post Number: 20
Registered: 07-2007
| | Posted on Wednesday, September 30, 2009 - 02:38 pm: |
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Thanks Mark, that gives me some ideas on what to try. Appreciate it. |
