Like Tree0Likes

Engine Alarm constant over 4500 rpm

Reply
Old 07-13-2008, 10:23 AM
  #11
Rough Seas Lie Ahead
Gold Member
 
Reckless32's Avatar
 
Join Date: Feb 2002
Location: Virginia Beach, VA
Posts: 2,465
Default

Yes.....IAC. You're in a soft alarm. 2 beeps per minute tells you it's a soft non-critial issue. At 4500 it goes into a soft guardian mode reducing your avaialable horsepower down to 90% and the alrm goes constant until you back it down to 1100 rpm where it goes back to the 2 beep deal. Rough idle is another indicator i.e. IDLE air control.

It's located looking aft, on the top rear of the motor near the throttle linkage mount. Kinda looks like a little thermostat. Two allen wrench type screws holds it on and a electrical connector. Simple, somewhat cheap and easy.
Reckless32 is offline  
Reply With Quote
Old 07-13-2008, 01:31 PM
  #12
Registered
Thread Starter
 
Expensive Date's Avatar
 
Join Date: May 2006
Location: West Creek NJ
My Boats: 05 35 Fountain EX
Posts: 4,220
Default

Quote:
Originally Posted by Magicfloat View Post
Just got a call from a friend and tech guy,he said IAC(Idle air control)He said same symptoms on 3 boats recently,IAC solved it.I trust what he tells me.The IAC is not very expensive and easy to change out.
Tell your friend its 4 boats in a row installed a new one this morning and its is now running great.Thanks to everyone for your help Tim
Expensive Date is offline  
Reply With Quote
Old 07-13-2008, 02:50 PM
  #13
Registered
 
cosmic12's Avatar
 
Join Date: Jan 2006
Location: Syracuse N.Y.
My Boats: Dreaming of a 32 AT
Posts: 4,951
Default

Tim, did it set any codes? I would really like to know because we still don't know what was up with the 271
cosmic12 is offline  
Reply With Quote
Old 07-13-2008, 03:34 PM
  #14
Registered
Thread Starter
 
Expensive Date's Avatar
 
Join Date: May 2006
Location: West Creek NJ
My Boats: 05 35 Fountain EX
Posts: 4,220
Default

Quote:
Originally Posted by cosmic12 View Post
Tim, did it set any codes? I would really like to know because we still don't know what was up with the 271
Never used the scan tool,The guy who owns the marina was not around so I just put on a new one.If yours does it again I would just change it
Expensive Date is offline  
Reply With Quote
Old 07-13-2008, 04:50 PM
  #15
Registered
 
cosmic12's Avatar
 
Join Date: Jan 2006
Location: Syracuse N.Y.
My Boats: Dreaming of a 32 AT
Posts: 4,951
Default

Thanks, Never has done it again but we will be look'n for it. Glad it was an easy fix for ya. By the way whatever happened with Micky Ds ?
cosmic12 is offline  
Reply With Quote
Old 07-13-2008, 08:50 PM
  #16
Registered
VIP Member
 
Join Date: Jan 2004
Location: Boca Raton, FL
My Boats: None
Posts: 3,682
Default

If you have a Smartcraft engine, sometimes a bad IAC sounds the beeper, but a code does not always come up. I have also seen bad senders for the sea water pump pressure. The scan tool said it had 62 Lbs. at idle. No way a hose clamp could hold pressure like that or the hose not blowing up like a balloon.
Edward R. Cozzi is offline  
Reply With Quote
Old 09-10-2008, 10:03 PM
  #17
Registered
 
rhsj2006's Avatar
 
Join Date: Oct 2006
Location: San Jose, CA
My Boats: 2003 FasTech 292
Posts: 163
Default

Wish I had seen this thread a week ago. Had the exact same symptoms, and my marina shop chased the gremlin for a couple of hours before swapping the (good) starboard IAC to the (bad) portside. Viola! Problem solved, one new IAC for the portside and I'm back on the water.

Frustrating though, since I've only had about 5 days on the water this summer and was really looking forward to getting out that day. IAC problem hit the moment I splashed that day...
rhsj2006 is offline  
Reply With Quote
Old 09-10-2008, 10:34 PM
  #18
Registered
Thread Starter
 
Expensive Date's Avatar
 
Join Date: May 2006
Location: West Creek NJ
My Boats: 05 35 Fountain EX
Posts: 4,220
Default

Its common for the 6.2s from what I have been told.I actually keep a spare with me.I got a lot of help from OSO and I also goggled the symptoms "engine alarm 6.2" went into a bunch of other boating forms.Which said IAC valve.
Expensive Date is offline  
Reply With Quote
Old 09-11-2008, 11:02 AM
  #19
Registered
 
Dave_N's Avatar
 
Join Date: Jan 2005
Location: Newport Beach,CA
Posts: 573
Default

Quote:
Originally Posted by Expensive Date View Post
Its common for the 6.2s from what I have been told.
It's a real common problem on all the ECM/PCM555 engines. I believe that a lot of failures are caused by a restricted IAC muffler, which cause the IAC to run continuiously at 100% Duty Cycle and overheat.
Dave_N is offline  
Reply With Quote
Old 10-13-2008, 12:37 PM
  #20
Registered
 
rhsj2006's Avatar
 
Join Date: Oct 2006
Location: San Jose, CA
My Boats: 2003 FasTech 292
Posts: 163
Default

Unbelievable. Port side IAC went bad on last trip out (4 weeks ago). Replaced it, all seemed fine until I went to do the 160 mile round trip to San Francisco Bay yesterday morning.

50 miles out the starboard engine started acting up in the same way, guardian mode, 2 beeps every 1 minute, etc. Had to limp home and am really p*ssed at myself for not replacing both IACs at the same time...

I will start carrying a spare on board.
rhsj2006 is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
vandeano
General Q & A
3
08-17-2006 03:01 PM
95caliber
General Q & A
6
07-01-2006 04:57 AM
Dregsz
General Q & A
1
02-02-2006 07:59 AM
Krumbsnatcher
General Q & A
26
07-17-2003 12:43 PM
Cigaretteman
General Q & A
3
11-13-2002 07:08 AM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 01:17 PM.


Copyright 2011 OffShoreOnly. All rights reserved.