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| Merc 5.0 alarm / no idle?? https://www.smwebhead.com/phpBB3/viewtopic.php?f=6&t=12068 |
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| Author: | Alan_G_298Vista [ Mon Jul 29, 2013 7:06 am ] |
| Post subject: | Merc 5.0 alarm / no idle?? |
I have a weird one here. Crushing along on plane and I get a two beep alarm, same sound as when you turn the key on at startup. Temp was perfect, oil pressure perfect, motors running perfect. I take it off plane as we were almost at the anchorage anyway. Two minutes later I get another two beep alarm all gauges still show everything is fine so I keep going to set-up. As I get down to idle speed the port engine shuts off and won't restart, just turns over, so I finish setting up with the starboard so I can check everything out. Once I have a chance to go over everything I see, oil levels on port engine is fine, drive oil level fine and I can't see any signs of anything wrong. After playing around I figure out that I can start the engine if I depress the gear override and give it a touch of gas, motor starts and runs perfect, but it won't start in neutral, just turns over and won't catch. Since I could get it going again for the way home yesterday, I started the port engine this way and could quickly snick it into gear and drove home, gauges showed perfect the whole way back, but every 2 minutes the alarm would beep twice. If I go down to idle on the port engine dies! Other then that it seems to run perfect and makes normal power. Anyone have this happen? I'm kind of stumped where to investigate. |
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| Author: | jsimon [ Mon Jul 29, 2013 8:14 am ] |
| Post subject: | Re: Merc 5.0 alarm / no idle?? |
Quote: Anyone have this happen? I'm kind of stumped where to investigate. I have not, but a guy I know had similar symptoms on the starting, he did not have the alarm that Im aware of. He changed the IAC valve and it aolved the issue. hopfully its that easy |
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| Author: | jfair [ Mon Jul 29, 2013 8:37 am ] |
| Post subject: | Re: Merc 5.0 alarm / no idle?? |
My "two beep" problem was eventually solved by replacing the water pressure sensor on the power steering cooler (top and back of engine). About 2011 Mercruiser improved the design of the sensor. Apparently it was installed in the raw water pump area on older models. A malfunction of this sensor would not have any connection with engine problems. |
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| Author: | Alan_G_298Vista [ Mon Jul 29, 2013 8:48 am ] |
| Post subject: | Re: Merc 5.0 alarm / no idle?? |
Jeff, what / where is the IAC valve, not heard of it before. Just wondering its purpose to see if it makes sense with my symptoms, thanks! |
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| Author: | jfair [ Mon Jul 29, 2013 9:14 am ] |
| Post subject: | Re: Merc 5.0 alarm / no idle?? |
This is worth a read: http://www.boatingwinnebago.com/forums/ ... ry-minute/ |
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| Author: | Alan_G_298Vista [ Mon Jul 29, 2013 11:00 am ] |
| Post subject: | Re: Merc 5.0 alarm / no idle?? |
jfair wrote: Wow, thanks as this explains my problem exactly and I'm sure it's the issue. I'll order this and let everyone know how it goes next weekend after I change it out. Looks like a very easy fix, thanks again for the info. |
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| Author: | Winter Sux [ Mon Jul 29, 2013 1:35 pm ] |
| Post subject: | Re: Merc 5.0 alarm / no idle?? |
Make sure the carb cleaner you get is oxygen sensor safe. |
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| Author: | Alan_G_298Vista [ Sat Aug 03, 2013 7:44 am ] |
| Post subject: | Re: Merc 5.0 alarm / no idle?? |
Success!! IAC valve confirmed, changed it out and it started right up, idled perfectly. Very easy to do, took me 20 minutes tops. Thanks for the help to diagnose the problem! Cheers |
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