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Onan no spark when cranking Update

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Steve

04-12-2004 06:21:57

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This is a update to my last post about a Onan P220V that has no spark while cranking buts fires when key is released. Following advice from replies to my question I took the ignition key switch apart noting the terminals for off, on, and start and made my own wiring diagrams. ( have none for this Mtd mower or the Onan engine )Checked operation of switch with ohm meter and it worked and also bypassed the switch by jumping the connector itself to see if it would make a difference. No change. Removed the safety switches all except the park switch so the mower couldn't be started in gear. Checked voltage at coil with key both in run and start position and had 12 volts. Removed flywheel and had so much dust that the stator was hard to see. Cleaned it and reinstalled everthing and the engine fired up. I let it warm up then shut it off to install the deck which took about 20 minutes then went to mow the grass only to find out it wouldn't start again. Flood the engine to get it to start on momentum, once started it runs smooth, mow grass for about two hours and the engine won't idle, keeps surging if the blades aren't engaged or the engine isn't under a load like pulling a hill, even parked with throttle wide open it surges up to the governer. Taking a guess it surges to 3600 rpm , drops to 3000 rpm , back up and so on. Can smell that it is burning rich but there is no adjustments because the jets are fixed. Something in the iginition circuit is going out and with what Onan parts cost who can afford to guess. Any ideals to track this down. This engine is 9 years old and has never acted up before.

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jwh

04-12-2004 18:18:31

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Re: Onan no spark when cranking Update in reply to Steve, 04-12-2004 06:21:57

One thing that can make my p218 onan surge bad is a piece of dirt covering the air bleed in the top of carb. It happens after changing the air filter once in awhile. Try a little carb cleaner down inside around the carb top and a gentle blast of air. Jim

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txblu

04-12-2004 07:44:14

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Re: Onan no spark when cranking Update in reply to Steve, 04-12-2004 06:21:57

Let's take the governor out of the loop. When it starts surging, either hold the governor connection to the carb, or disconnect the connecton. Do something to hold the butterfly in a fixed position so the engine won't attempt to run wide open. (piect of wire would work). I really think the gov is not the problem as it functions correctly when the machine is running properly.

Then determine if it is spark or fuel. An aircleaner removal and can of starting fluid would be next. Do whatever you do to get it to surge (if it will now that the gov is disconnected) and when it drops in rpm's squirt it in the carb. It's reaction is where you head. My guess is that you have a magneto going out as they are notorious (spelling) for quitting when hot. Have had several. Most of my fuel problems (other than non vented fuel tank problems) are constant problems not thermally related..... except for lean mixtures where I had an adjustment screw I could open and richen the mixture.

When you say you smell gas, your magneto (coil) could be intermittently shorting out (or opening up)and doing the dirty deed.

What you might do if you don't get what you want with the spray, is get it to malfunction and immediately remove the mag (coil) and put it in the freezer for 10-20 minutes then quickly reinstall and see if it fires.

txblu

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DPKL

05-17-2006 22:30:26

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Re: Re: Onan no spark when cranking Update in reply to txblu, 04-12-2004 07:44:14

I have a P220G that runs for about 2 minutes then shut down with no spark. Please look at dpkl onan p220g let me know what fixed yours. thanks

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