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Restoration & Repair Tips Board

Re: IH-454 Gas High Idle

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Mark W.

04-30-2013 07:35:57

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I would pull the main jet and make sure it is clear. Sounds like it's not getting enough fuel.

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04-30-2013 16:43:20

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 Re: IH-454 Gas High Idle in reply to Mark W., 04-30-2013 07:35:57  
next time it does that loosen the gas cap. tank vent could be clogged.

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04-30-2013 14:55:22

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 Re: IH-454 Gas High Idle in reply to Mark W., 04-30-2013 07:35:57  
Thanks. I will definately look into your idea again just in case. With the choke position that seems to make sense.

I did tear the carb apart again earlier this morning (before getting your advice) and nothing caught my eye. Maybe it was re-jetted incorrectly by previous owner as there is no tag or ID on the carb, other than Zenith name. I swagged all the ports and blew them out with cleaner/air....again, nothing caught my eye.

After swapping out the plugs just about an hour ago (which were in questionable shape) the tractor immedietly seems more responsive, even regarding the choke position. However, after a few minutes of mowing, the engine now surges wide but regularly on 2 second intervals. The other ignition parts are so new they aren't even dirty yet, including the points.

The coil isn't getting hot, per other forum posts.

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05-15-2013 05:00:59

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 Re: IH-454 Gas High Idle in reply to Mrfix71, 04-30-2013 14:55:22  
After working with this tractor for a few weeks now, I went back to the local dealer with the carb. The service manager tried to help but told me the carb was not the correct one and that I should have a Marvel, which is odd because the Zenith is clearly shown as an option in the service manual.

After giving up for a while and shopping around for a sub-compact diesel replacement, I checked out the 454 again yesterday. On a whim, I tried and was able to run the engine at high idle with the PTO engaged with a gasoline "IV drip" to one of the carb's other inlet ports, even though the pump appeared to be working. Whenever I choked off the IV drip the engine would appear to starve for fuel but would rev back up when I raised the IV again. I also noticed the ignition coil is now getting so hot that I had to hold it with a wrapped up towel. The coil is making a sloshing noise which I have never experienced with a coil.

So.....gonna try a new fuel pump and coil and share the results so it can help others.

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05-22-2013 12:48:16

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 Re: IH-454 Gas High Idle in reply to Mrfix71, 05-15-2013 05:00:59  
I bought a fuel pump thru Ebay store as I didn't feel like paying $130 at the IH dealership. I ended up getting the wrong pump and lack of sources lead me back to the dealership. The good news is that the tractor ran fine under load. There is a little amount of adjustment left to eliminate surging.

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