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Onan 4000 Backfires when shutting down - Electrical Supplies

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I wouldn't panic about it. I would only be concerned if it was backfiring while it's running.
When the engine is shut off the momentum spins the engine around a couple of times and hot spots in the exhaust ignite the raw fuel.
Cleaning the carbon out of the exhaust may help.

Posted on Jan 13, 2018

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: Oil type for Onan 4000 generator

SAE 15W-40 is what i used to use
synthetic? not sure about that one there may be oil pres switch that could give you a problem.

Posted on Apr 17, 2009

Anonymous

  • 77 Answers

SOURCE: onan 4000 start good runs only ten minutsand shuts down,starts up

First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

Posted on Aug 10, 2009

Anonymous

  • 31 Answers

SOURCE: galant 95 backfires and shuts down at higher rpms

check ur plug wires they might be mismatched ...joe

Posted on Aug 29, 2009

Anonymous

  • 6 Answers

SOURCE: Onan MicroQuiet 4000 Generator

Remove the air cleaner and inside near the throat of the carb is two bolts holding the carb to the intake remove these. Unhook the fuel line and twist the carb to allow the linkages to remove.

Posted on Sep 28, 2009

Terry Corrow

johnny rebel

  • 10875 Answers

SOURCE: JD '86 316 Onan engine shuts down when mowing, then backfires. It will restart but if the hydrostatic lever moves it will shut down again.

the safety switch to the hydro lever is going bad

Posted on Apr 29, 2015

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2 Answers

Onan 4000 Microquiet shuts down after running for 20-30 minutes. If I direct 2 high power (400+ CFM) fans to the underside of it -it will keep running indefinitely.


check the current draw from the machine
being a 4000 watt machine if you are drawing 4000 watts it is overloaded as that is the surge power available not constant power which is around 3500 watts
that would account for the requirement of fans to keep it cool
even if It is not 4000 watt what ever capacity it is it is running in an overload situation

Jul 10, 2016 | Onan Microquiet 3600 & 4000 Generator

1 Answer

By pbarker987 on Jun 02, 2010 " " I have an onan microquiet 4000 KY. It will not start, fault code on red light indicates (35) control card failure. Before I take it to authorized onan repair is their...


Because it wont start does not indicate a control board problem It will start but it will shut down within a few seconds if it was. enail me and i will try to help you with the problem jbogilvie@hotmail.com

Jun 23, 2010 | Watts Onan Portable Generator - 4000 ,...

3 Answers

Onan MicroQuiet 4000 Generator


Remove the air cleaner and inside near the throat of the carb is two bolts holding the carb to the intake remove these. Unhook the fuel line and twist the carb to allow the linkages to remove.

Sep 14, 2009 | Watts Onan Portable Generator - 4000 ,...

1 Answer

Galant 95 backfires and shuts down at higher rpms


check ur plug wires they might be mismatched ...joe

Aug 29, 2009 | 1995 Mitsubishi Galant

1 Answer

Shuts down after about five minutes and wonr


If it runs really rough before shutting down it is most likely a spark plug.

Jun 29, 2009 | Watts Onan Portable Generator - 4000 ,...

2 Answers

Onan 4000 start good runs only ten minutsand shuts down,starts up


First locate the oil pressure switch and see if you can bypass it,then see if it runs. If not check the fuel filter and fuel pump,make sure solonoid for fuel pump is kicking on.

Jun 07, 2009 | Watts Onan Portable Generator - 4000 ,...

2 Answers

ONAN 4000 RUNS FOR ONE HOUR AND DIES--ANY IDEAS WHY?


Try to restart to see what happens. However, make sure to have a volt meter to check output voltage. You may be loosing voltage and therefore it shuts down. Check oil pressure switch, rings, brushes. Replace brushes if they are less than 1/2" short and clean rings with emory cloth until copper is noticable.

Jan 21, 2009 | Watts Onan Portable Generator - 4000 ,...

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