www.iFourWinns.com

Dedicated to Current and Future Owners
It is currently Sat Apr 27, 2024 9:54 am

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 6 posts ] 
Author Message
 Post subject: High rpm idle
PostPosted: Sat Aug 06, 2016 11:03 pm 
Offline
Goldfish

Joined: Fri Oct 17, 2014 5:39 am
Posts: 34
I recently noticed my rpm at idle, after cruising for a few minutes, will not drop below 1500 when back in neutral. If I turn off engine and restart, idle drops back down to normal, around 600 or so. Throttle and shift cables were replaced prior to season and there has been no issues until now. 1999 268 with vp gsi. Any thoughts?
Thanks

_________________
1999 Vista 268


Top
 Profile  
 
 Post subject: Re: High rpm idle
PostPosted: Sun Aug 07, 2016 10:07 am 
Offline
email admin your custom rank

Joined: Sun May 20, 2012 4:31 pm
Posts: 873
Location: Minneapolis, MN
You said that the throttle and shift cables were replaced. I'd recommend checking the installation and security of the throttle cable at the shift quadrant and at the engine. Pay particular attention to the secure mounting of the moving cable itself, and also the cable housing on both ends. You may have a cable that was not installed correctly and something has come loose.

The throttle quadrant can be accessed by removing the decorative cover and removing or loosening 4 screws. The cover just snaps into place. move it forward or backward and lift. You should be able to remove the screws and lift the quadrant out. The engine throttle cable is on the outboard side of the quadrant and the shift cable is on the forward side. The 2 "nesting" brackets that hold each cable housing include 3 parts:
1. a (maybe) 3 inch long plastic channel that the cable lays in. This channel has a screw that attaches to the quadrant.
2. a "U" shaped flat plastic piece about 1/ 8th inch thick, about 1/2 inch square, with a slot that fits in a groove in the cable housing. This piece fits in a groove inside item #1 and prevents the cable housing from moving inside item #1.
3. a sheetmetal "U" shaped channel that covers the plastic channel (item #1) and holds everything together.
Hope this helps.

http://s29.photobucket.com/user/garyboc ... sort=3&o=3

_________________
Surface Interval: A scuba diving term for that time between dives to relax and prepare for life's next great adventure.

Current boat: '02 FW 268 Vista
Previous boat: '95 FW 190 Horizon


Top
 Profile  
 
 Post subject: Re: High rpm idle
PostPosted: Sun Aug 07, 2016 7:51 pm 
Offline
Goldfish

Joined: Fri Oct 17, 2014 5:39 am
Posts: 34
Thanks for the detailed instructions SI. I'll give it a try.

_________________
1999 Vista 268


Top
 Profile  
 
 Post subject: Re: High rpm idle
PostPosted: Mon Aug 08, 2016 10:17 am 
Offline
email admin your custom rank

Joined: Sun Jul 22, 2012 5:10 pm
Posts: 2032
Location: West Palm Beach, FL
As SI said, the throttle cable is certainly the first suspect since you said it was changed recently.

Also, an Idle Air Controller valve (IAC) is responsible for controlling the idle speed on a fuel injected engine. A faulty IAC will often lead to a 1200-1500 rpm idle, and can be an intermittent problem.

_________________
Image
"Knot Easy" 2000 Horizon 240 Volvo 5.7GS /SX
tow: 2017 Honda PILOT EXL-AWD
prev. boats:
'87 Chaparral 198CXL 4.3 OMC Cobra
'69 Jetstar 16ft Ski Boat, 115hp Yamaha
'68 Aluminum Jon Boat, 3hp Sears
'64 Water Wings


Top
 Profile  
 
 Post subject: Re: High rpm idle
PostPosted: Mon Aug 29, 2016 5:19 am 
Offline
Goldfish

Joined: Fri Oct 17, 2014 5:39 am
Posts: 34
Update: looks like problem was the IAC valve. I removed it and pushed the piston in to free it. Problem gone after reintsallation. Will be replacing. Thanks for all the help!

_________________
1999 Vista 268


Top
 Profile  
 
 Post subject: Re: High rpm idle
PostPosted: Mon Aug 29, 2016 9:20 am 
Offline
email admin your custom rank

Joined: Mon Jun 02, 2014 7:24 pm
Posts: 618
Location: Lake St. Clair USA
Good fix, thanks for following up!

_________________
NEW - 2000 Cobalt 246 w/454 Magnum 385HP | SOLD - 2000 FW Horizon 180 LS w/5.0Gi 250HP Volvo Penta

Image


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 23 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group