gp49
San Francisco Bay Area
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Just got back from a short trip to Yosemite Valley. The weather was good. Nights in the low 30's days in the mid 40's. It was a good trip (My six year old made it to the base of Nevada Falls, the 3 year old made it to the base of Vernal Falls !! - both made it back under own power !) accept for the generator hickup.
I have a Generac Impact-36 plus II (model 941-3) about 55 hrs total, oil changed about 8 hrs ago. The generator started before the trip without any problems and run great. Fast forward to first evening took about 5 tries to get the generator running. The first four times the generator would start and run for a few seconds then die. It finaly started and stayed on.
Second evening same thing. The generator would start and run for a few seconds and then die. I gave up after about 10 tries ( did not realy need the extra charge - just wanted to warm up the milk for the kids in the microwave...used cook top instead)
Just got home unloaded the camper and same thing. The generator, start fine but dies after about 4 - 5 seconds...
Control board ? Oil pressure switch (if it has one)?
I have the service manual and the owners manual and will work on it next weekend but may be some of you had similar issues....
Thanks,
Mark
2002 Ford 7.3 cc drw lariat
2004 Lance 1161
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BillS
Mount Pleasant, TX
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It could be several things, but most likely is the oil pressure switch. What viscosity oil did you use when you changed the oil? It could be that the low temperatures in combination with a higher viscosity oil failed to allow the oil pressure come up quickly enough. Having owned several Onan generators that I regularly used SAE 30 oil, I tired the same in my Generac and had a similar problem in cold weather. When I switched to SAE 10W30, I never had the problem again.
Bill
'03 Lance 1121
'03 Dodge 3500 Diesel Dually
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trop-a-cal
Palm Coast Fl
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Sometimes the fuel lines get cracked and the starved generator won't start. Leaking oil pressure sensor another posibity. Sign of leaking oil pressure sensor,is oil around it and on the drip pan. The sensors must be replaced if they leak, as pressure won't happen, the sensor tells fuel to shut off.
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jeeppoor
Michigan
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Joined: 11/16/2009
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We had the same problem.
It wound up being a dirty spark plug. After I cleaned and regaped the spark plug it ran fine.
Now we carry a spare spark plug and tools to change it.
I would check this first before I went and replaced anything.
Hope this helps.
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Admiral
Upstate Ohio
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Joined: 06/08/2003
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See if the gen is getting fuel by disconnecting the fuel line @ the carb to see if the pump is putting out.
Check your oil level. Low level will cause the gen to shut down. High level may cause oil frothing with bubbles. When the bubbles reach the pump the pressure drops.
Some gens shut down when the regulator does not detect voltage output.
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sleepy
Oak Ridge,Tennessee
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Joined: 04/07/2003
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Admiral wrote:See if the gen is getting fuel by disconnecting the fuel line @ the carb to see if the pump is putting out.
Check your oil level. Low level will cause the gen to shut down. High level may cause oil frothing with bubbles. When the bubbles reach the pump the pressure drops.
Some gens shut down when the regulator does not detect voltage output.
he has a built in propane generator... where is the pump... the carb?
2003 Lance 1161,/slideout/AGM batteries/255W Solar/propane generator/Sat dish/2 Fantastic Fans model 6150/AC/winter package
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sleepy
Oak Ridge,Tennessee
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Check the air filter first... I have cleaned wasp nests and mud daubber mud out of the filters.
DO NOT try to adjust anything... they are set up at the factory and you won't have what it takes to return it to the proper settings after you've done the screwdriver trick.
PM me with a phone number and I'll walk you through it.
Sleepy
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cord812
Covington, Georgia
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Joined: 09/14/2003
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the year after I bought my 1161 my generac impact started acting up.. not running shutting off.. it went to a generac service center and back re-installed and the same problem.
finally I removed the cover on the left side (drivers side of gen.) where the plug wire goes into and looking around to see if I could find something lose.
I did download the free shop manual...it is very helpful
there are a number of connectors under there.. I found one that had pushed the wire out of the connector ...a very small wire.. when I plugged it back in that eliminated my gen. problems... but I was also told by a gen. tech. at a r.v. dealer to re-torque the head and adjust valves afterward.. that turned out to be good advice.
the head bolts were loose.. I wanted to pass that on to everyone with the impact.
It looks like that gen is no longer being made...other than being loud it does the job if you can keep it running
I currently have 240 hours ( knock on wood )
emmitt kelly
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gp49
San Francisco Bay Area
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Thanks for all the replies !!! So far no one has mentioned the circuit control board $$$$$ I will check into the problem this Saturday
Mark
ps oil used is 10-30
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sleepy
Oak Ridge,Tennessee
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Joined: 04/07/2003
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We have over 1000 hours... on our generac...
this year we had the generator removed from the camper by a certified generac technicion at Johnny Walkwer RV in Las vegas.
They repaced the starter,
adjusted the valves
and adjusted our propane regulator (at the bottles) to the correct pressure.
The tech said.... never try to adjust the fuel mix.
sleepy
BTW... one of the major problems is a kink in the hose that doesn't show... it's the lining on the inside of the hose that kinks... There is enough propane leaking through to start... but not enough to run.
Another can be the little "L" shaped tube just under the air filter is knocked off on one end... it really screws up the fuel/air mix. It has a neat V shape on the end... squeeze it slightly... makes it go back over the tube easily.
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