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Car Forum / Driving, Maintenance, Tuning / RVs / October 2007Onan 4.0 Gas Genset
Hi, I have an Onan Microquiet 4000 4KYJ FA26100J. It has about 85 hours on it and is 6 years old. Originally it was surging badly. I took off the carburetor, thinking it needed cleaning. This unit doesn't get much usage, and I thought it was gummed up. Unfortunately, the cleaning didn't help. The local repair shop told me that the carburetor is not cleanable and that I should replace it. I purchased and installed a replacement, but I am now experiencing a different problem. It starts and only runs for about 2 seconds; it then stalls and flashes 3 quick flashes repeatedly. My manual gives me the useful info "Service needed." I am pretty sure I messed up the adjusting screws now, compounding the problems. Are there preliminary screw adjustments that might help? Any suggestions as to how to proceed from here? I have the same Gen. as you have. Id take it in to an Onan Repair Center ; if its just adjustments .. they should be able to do that within 1 hour costing you about $85 . Then youll have a peace of mind. Unfortunately, the local RV dealer wants $450 to give an estimate. This seemed pretty steep to me! If it were $85, I would gladly have paid it. >I have the same Gen. as you have. Id take it in to an Onan Repair > Center ; if its just adjustments .. they should be able to do that > within 1 hour costing you about $85 . Then youll have a peace of mind. 'un, Oct 14, 2007, 1:19pm (CDT-2) From: jalperson@palomar.edu (Jay Alperson) Unfortunately, the local RV dealer wants $450 to give an estimate. This seemed pretty steep to me! If it were $85, I would gladly have paid it.' REPLY: Jay, That is incredibly abusive. How can they justify charging that for a 1 hour max. estimate ? You should go to the Onan website and obtain the nearest Onan Factory Repair Center ; the one by me does an estimate up to one hour for $89. Dave. > Hi, > [quoted text clipped - 13 lines] > Are there preliminary screw adjustments that might help? Any suggestions > as to how to proceed from here? Jay, The 3 flashes are a first-level code. There will be a second-level code which gives you information on what the genset control thinks is wrong. You can access it by pressing 'stop' once while it is giving you the 3 flash code - it will begin giving you the second-level code, which will be two digits. Anyplace that has the service manual can tell you what that code means - which will point you in the direction you need to go. I suspect - given you've changed the carburetor - that the genset is running either too fast or too slow. As far as the adjustment screws go, there are only two - the main jet (which is labeled altitude adjust, and has a cap on it that limits changes to about 1/4 turn), and the idle stop screw (the screw the linkage touches when the throttle is in the closed position). The idle stop screw should NOT touch the linkage when the genset is running - back it out until it will deifinitely be clear, then start the genset and see what happens. If you haven't removed the cap on the main jet, you can't get it far enough out of adjustment to cause an error code. Anything further would require knowing what the second-level code is, to make sure we're heading in the right direction. Alan Thanks for responding! The second level code is 14. The idle stop screw is not touching the linkage. What's next?? >> Hi, >> [quoted text clipped - 37 lines] > > Alan > Thanks for responding! > > The second level code is 14. The idle stop screw is not touching the > linkage. What's next?? Ok, I don't have the manual here at home, so this is from memory - but I believe that 14 is 'frequency too high', which would indicate that it's running too fast. Will check the manual at work tomorrow. You could verify this with a frequency meter (or a voltmeter that also has a frequency function), but it sounds like you either have the throttle linkage bound up so the governor can't close the throttle when up to speed, or you have been adjusting the governor - which shouldn't have been needed just for a new carburetor. The governor holds the throttle wide open when the genset is stopped. When it starts and comes up to speed, the governor should close the throttle once the genset gets to approx 63 hz / 3780 rpm, and from that point open or close the throttle as needed to try to maintain a constant speed - with no load, the throttle should be almost completely closed. If the genset IS closing the throttle once running - but still gives code 14 - then it sounds like the governor adjustment is messed up. If you don't have a frequency meter, your best bet is to find an Onan service location (from what you say in your other post, NOT your local rv center) and have them check and adjust - if nothing is actually broken, shouldn't take more than an hour to get things set properly - probably less. Alan |
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