ctfortner
Cadet
- Joined
- Feb 26, 2018
- Messages
- 13
My (new to me) 5.8 EFI Volvo is idling high, around 1500 rpm, even after it is up to temp. I was thinking the IAC valve may be bad or previous owner may have adjusted the TB idle screw. It idles good, although high, and ran great on the water. Shifted slightly hard in and out of gear because of idle.
Today I ran it to temp and then disconnected the IAC, it stuttered briefly and died. Would not crank with it disconnected. Plug it back in and it is right back to idling 1500 rpm. Should it idle (even poorly) with IAC disconnected? I am wondering if someone before me adjusted that idle screw, or should I just get a new IAC vave and swap out and try that first?
I have not disconnected the throttle cable yet to see if that could be the issue, but this may sound dumb, but If the boat is in neutral, I have tried pushing on the throttle itself to see if it would idle down...but the throttle cable will not move forward or backwards when trying to do so at the TB by hand., while boat is sitting in neutral.
I made a video of it running and then dying, see if this link will work
https://photos.app.goo.gl/ewfrZQMDkfJDx4502
Today I ran it to temp and then disconnected the IAC, it stuttered briefly and died. Would not crank with it disconnected. Plug it back in and it is right back to idling 1500 rpm. Should it idle (even poorly) with IAC disconnected? I am wondering if someone before me adjusted that idle screw, or should I just get a new IAC vave and swap out and try that first?
I have not disconnected the throttle cable yet to see if that could be the issue, but this may sound dumb, but If the boat is in neutral, I have tried pushing on the throttle itself to see if it would idle down...but the throttle cable will not move forward or backwards when trying to do so at the TB by hand., while boat is sitting in neutral.
I made a video of it running and then dying, see if this link will work
https://photos.app.goo.gl/ewfrZQMDkfJDx4502