BFN backfires at 4600 rpm
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=37226
Printed Date: October-07-2024 at 4:33pm
Topic: BFN backfires at 4600 rpm
Posted By: michiel200
Subject: BFN backfires at 4600 rpm
Date Posted: August-29-2015 at 5:21pm
My '92 Barefoot with 5.8 HO PCM is backfiring at 4600 and will not allow higher rpm. Below 4600 rpm no problems. It starts, idles and accelerates fine. The engine still has the notorious Protec ingition. Coils look oke, no leaks.
Is this the first sign the Protec is shot?
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'92 BFN
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Replies:
Posted By: Jonny Quest
Date Posted: August-30-2015 at 2:16am
Your problem is likely due to either timing or carburetion.
Since ProTech manages the spark/timing, ProTech could be the problem. However, that is not the symptom my ProTech was showing when it failed, but that doesn't mean that yours isn't about to crap-out and is the cause of your back-fire problem.
When was the last time that your carb was re-built?
JQ
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Current
2003 Ski Nautique 206 Limited
Previous
2001 Ski Nautique Open Bow
1994 Ski Nautique Open Bow
Aqua skiing, ergo sum
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Posted By: michiel200
Date Posted: August-30-2015 at 4:52am
I own the boat for six years now, never opened the carb.
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'92 BFN
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Posted By: GottaSki
Date Posted: August-30-2015 at 10:14am
Please explain in detail. Is it trueky back firing out the exhaust, or farting out the carb? People use the term backfiring liberally.
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"There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing."
River Rat to Mole
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Posted By: michiel200
Date Posted: August-31-2015 at 6:09pm
I'll try to explain.
At 4600 rpm, the engine does not climb in revs anymore (WOT was previously 5100 rpm).
It produces a banging noise from the carb. Like it is misfiring. It's not the choking sound of an engine that does not get enough fuel at high revs, Thanks for your help!
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'92 BFN
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Posted By: ultrahots
Date Posted: August-31-2015 at 11:15pm
So it is Popping out the carb or just running out of throttle ? If it is backfiring there could be a number of things wrong. More info will be needed.
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http://www.correctcraftfan.com/diaries/details.asp?ID=6960&sort=&pagenum=2&yrstart=1986&yrend=1990" rel="nofollow - 1980 Show Nautique
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