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| High rpm idle https://www.smwebhead.com/phpBB3/viewtopic.php?f=11&t=15090 |
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| Author: | grkrze [ Sat Aug 06, 2016 11:03 pm ] |
| Post subject: | High rpm idle |
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 |
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| Author: | Surface Interval [ Sun Aug 07, 2016 10:07 am ] |
| Post subject: | Re: High rpm idle |
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 |
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| Author: | grkrze [ Sun Aug 07, 2016 7:51 pm ] |
| Post subject: | Re: High rpm idle |
Thanks for the detailed instructions SI. I'll give it a try. |
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| Author: | rpengr [ Mon Aug 08, 2016 10:17 am ] |
| Post subject: | Re: High rpm idle |
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. |
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| Author: | grkrze [ Mon Aug 29, 2016 5:19 am ] |
| Post subject: | Re: High rpm idle |
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! |
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| Author: | GottWhat [ Mon Aug 29, 2016 9:20 am ] |
| Post subject: | Re: High rpm idle |
Good fix, thanks for following up! |
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