RPM Gauge bouncing around
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=39679
Printed Date: October-07-2024 at 6:28am
Topic: RPM Gauge bouncing around
Posted By: mtguy
Subject: RPM Gauge bouncing around
Date Posted: August-15-2016 at 5:33pm
I noticed while idling back to the house after skiing this morning, that my RPM gauge was bouncing around a bit. Didn't feel or hear any change in motor...
I've searched for a solution to my RPM gauge bouncing around, but can't find one. I had this problem a year or two ago, and the solution was to tighten something... It was a quick easy solution, and apparently my memory is bad! I have GT 40 Pro Boss on '95 SN.
Any help would be appreciated.
Thanks
~Pete
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'95 SN
'53 Hutchuck
'56 Essaness Craft
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Replies:
Posted By: Dreaming
Date Posted: August-15-2016 at 5:47pm
since the tach is electronic, it gets its signal from the distributor and a ground from somewhere, likely under the dash. I would check 2 places, the ground under the dash, and the tach terminal that is at the distributor.
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Posted By: mtguy
Date Posted: August-15-2016 at 9:18pm
Thanks Kris...I'll look...Here's a stupid question, does an EFI engine have a distributor, or are they just on engines with carbs.?
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'95 SN
'53 Hutchuck
'56 Essaness Craft
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Posted By: Dreaming
Date Posted: August-15-2016 at 9:33pm
should be on both, unless you have a Protec ignition. I suspect its the ground that is giving you trouble. there are some grounds on the engine also, it would be worth wire brushing those to make sure everything looks nice and shiny.
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Posted By: mtguy
Date Posted: August-16-2016 at 12:29am
Thanks, I found it...Just couldn't visualize where it was. I also found the wires I tightened before on the back of the motor. They were tight but I will wire brush them tomorrow. All wires under dash were tight as well Had to put in a new blower today...
She's running great, so not too worried about it, but I'd like to find the culpret.
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'95 SN
'53 Hutchuck
'56 Essaness Craft
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Posted By: Gary S
Date Posted: August-16-2016 at 12:40am
Also if your tach has a selector switch on the back to change between 4,6,or 8 cylinders,which many of them do,cycle it thru the different settings several times and return it to the 8 cyl setting. Many times the selector switch corrodes just enough to mess up the reading.
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http://www.correctcraftfan.com/diaries/details.asp?ID=1711&sort=&pagenum=1&yrstart=1966&yrend=1970" rel="nofollow - 69 Mustang HM SS
95 Nautique Super Sport
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Posted By: mtguy
Date Posted: August-16-2016 at 1:34am
Thanks, I'll take another look-see tomorrow and see if I can find the switch...
Hope all is well in the Land of Lincoln.
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'95 SN
'53 Hutchuck
'56 Essaness Craft
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Posted By: Jonny Quest
Date Posted: August-16-2016 at 3:13am
Mine was bouncing around also, so I pulled the dash apart and then exercised (or exorcised) the switch by moving it back-and-forth a couple of times as mentioned above. Worked like a charm.
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: mtguy
Date Posted: August-16-2016 at 10:45am
Thanks Joe...I'm going to do that this evening.. Have to run up north and look at another repeater site for our EMS systems up here.
All of the connections were tight when I looked under the dash earlier, but that was before I knew there was a switch back there...
I'll report back to everyone as to the results!
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'95 SN
'53 Hutchuck
'56 Essaness Craft
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Posted By: Dreaming
Date Posted: August-16-2016 at 1:50pm
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MT, check out this thread for pictures of the dip switches... also, you should probably confirm whether you have protec ignition or not, looks like the OP in this thread was having trouble with his signal from the distributor http://www.correctcraftfan.com/forum/forum_posts.asp?TID=35597&PID=512459&title=vdo-tach-dipswitch-settings-w-protec#512459" rel="nofollow - link
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Posted By: mtguy
Date Posted: August-23-2016 at 2:14am
Hi all that responded. I can't seem to get the tach to replicate the problem, so perhaps there was a loose connection. Definitely doesn't do it under load as we've been skiing every morning. I did see a little bounce one morning while idling back down the river to our house. One thought.. I seem to have to leave the motor cover up after skiing or the motor acts like it has vapor lock the next time we go to start it. I read where it is the low pressure fuel pump, which was on my list to fix this year, but... Could it be that at idle, the low pressure fuel pump is causing the tach to move a bit? Just a thought from a novice motor guy.... Thanks again for your interest and help.
~Pete
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'95 SN
'53 Hutchuck
'56 Essaness Craft
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