Question about Watts Onan Portable Generator - 4000 , Model# 5500

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I have a Onan 4000 that turns over, but is not firing. I've replaced the coil, condensor, ignition controller, new spark plugs, new spark plug wires, any ideas

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Muntejaya Ginting

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Please check and fix the fuel line for clog up.

Posted on Apr 20, 2011

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My onan 4.0 grenerator motor will not idle and it is back fireing while trying to run is in the valves


If it is backfiring even during idle, there are a couple of possible issues. Check the obvious and least expensive first. Make sure you have correct OEM spark plugs, check ignition wires. Then check the ignition coil and trigger module, there is a procedure for doing that in the Cummins Onan manual. A manual can be obtained from http://www.advanced-power-technologies.com/ or local Onan RV dealer. This will give you the ignition coil resistance and the ignition module resistance. Also has anyone messed around with the carb, or has it sat for long periods, too lean a fuel mixture can cause backfiring. Good Luck ;)

Feb 11, 2015 | Onan CUMMINS 4.0 KYFA/6747 - Cummins...

1 Answer

Onan 4000 generator has no spark


If there is no spark, the ignition module may be bad, or the wiring to it. Have the module ohmed out. Also the magnetic trigger assembley that is on the rotor that sweeps past the ignition module maybe broken. If they check ok, suspect the control board

Mar 23, 2013 | Onan Microquiet 3600 & 4000 Generator

1 Answer

No spark to spark plugs on john deere 2510


do you have a bad wire or a bad wire going from the points to the coil

Jul 28, 2012 | John Deere Step 2510 2520 3010 3020 4000...

2 Answers

05 Ford Escape, coils #3 & #4 not firing. We've replaced the battery, spark plugs, alternator, coil packs, & pcm. Had pcm reflashed. Garage said it had to be coil packs, but just replaced coil packs 3


Check engine light on ? Code's ? What engine ? 2.3 l 4cylinder or 3.ol v-6 This vehicle has coil on plug ignition system , not coil packs ! a coil per cylinder . If new coils an still has no spark , has no B+ voltage to the coil or the PCM isn't controlling them . Without testing i'd only be guessing as to the problem .If the repair shop you had it to can only say it had to be the coils , I'd find another shop to take it to !
Autolite Coil on Plug Ignition troubleshooting

Jun 22, 2017 | Cars & Trucks

1 Answer

Onan generator service codes


Check the spark plug and the ignition coil for good sparking.

Get the spark plug out, or with another spark plug connected to high voltage cable, outside the motor, the outer part of the plug connected to motor ground and see if spark is present at cranking.

Jun 30, 2010 | Watts Onan Portable Generator - 4000 ,...

1 Answer

I have a 1976 Triumph Bonnievelle 750 motorcycle, I get no spark. I have replaced the coils, condensors, spark plugs, plug wires, points & wiring. I have installed electronic ignition still no spark....


Check your connections, recheck them, start from the battery go all the way through in your testing. Personally it soulds like an issue at the coil not getting fire.

Oct 22, 2009 | Triumph Bonneville Motorcycles

1 Answer

I need the diagram to put the spark plug cables


2003 Chevrolet Malibu 3.1L SFI OHV 6cyl
Spark Plug Wires - Removal & Installation

3.5L Engine
  1. Before servicing the vehicle, refer to the Precautions Section.
    NOTE Twist the spark plug boot one-half turn in order to release the boot. Pull on the spark plug boot only. Do not pull on the spark plug wire or the wire could be damaged.
  2. Remove the intake manifold cover, if required.
  3. Disconnect the left side spark plug wires from the spark plugs.
  4. Disconnect the left side spark plug wires from the ignition coil.
  5. Remove the spark plug wire clips from the Manifold Absolute Pressure (MAP) sensor bracket and the heater inlet and outlet pipe tab.
  6. Remove the spark plug wire assembly.
  7. If replacing only one plug wire, open the retaining clips and remove the appropriate spark plug wire.
  8. Disconnect the right side spark plug wires from the spark plugs.
  9. Disconnect the right side spark plugs from the ignition coils.
  10. Remove the spark plug wire assembly.
  11. If replacing only one plug wire, open the retaining clip and remove the appropriate spark plug wire.
To install:
  1. Install the spark plug wire assembly.
  2. Connect the right side spark plugs to the ignition coils.
  3. Connect the right side spark plug wires to the spark plugs.
  4. If replacing only one plug wire, open the retaining clip and install the appropriate spark plug wire.
  5. Install the spark plug wire assembly.
  6. Connect the left side spark plug wires to the spark plugs.
  7. Connect the left side spark plug wires to the ignition coil.
  8. Install the spark plug wire clips to the MAP sensor bracket and the heater inlet and outlet pipe tab.
  9. If replacing only one plug wire, open the retaining clips and install the appropriate spark plug wire.
  10. Install the intake manifold cover, if required.

Fig. 2.2L Engine Firing Order: 1-3-4-2 Distributorless ignition system
74d742b.jpg


Fig. 3.1L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system
306b531.jpg


Fig. 3.5L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system
9313fa7.jpg


Fig. 2.4L Engine Firing order: 1-3-4-2 Distributorless ignition system
2c9af72.jpg


Fig. 3.1L Engine Firing order: 1-2-3-4-5-6 Distributorless ignition system
d929c16.jpg


Fig. 2.2L Engine Firing Order: 1-3-4-2 Distributorless ignition system
f357cd3.jpg

Fig. 3.5L & 3.9L Engines Firing order: 1-2-3-4-5-6 Distributorless ignition system
09e9db9.jpg

I really hope help you with this (remember rated this help) Good luck.

Sep 23, 2009 | 2003 Chevrolet Malibu

2 Answers

No spark, just put in a new coil, distrbutor isnt dirty or wet, sombody told to check out the littl box's on the fender well, what are these to box's and what is there purpose? Mike 77 cj-5 304 3spd I...


I had the same problem with my 85 cj7 this week, I relpaced the ignition control module, plugs, wires, cap, rotor and the the coil; still had no fire to plugs. the problem turned out to be my distributor, replaced it today and she fired right up. Most likely it was the pick up module in the distributor that went bad.

Nov 30, 2008 | 1983 Jeep CJ7

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