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P700 Hard starting when hot.

BigMac

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Sep 22, 2015
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My 2016 700 starts good when cold or been running for several minutes. After 20 minutes or so or when 2 bars show on display it may not start or is very difficult.

Starter turns over but not firing. May fire after several attempts but need to flutter gas pedal to keep running. Then may stall again when idling when warm.

Honda mechanic now trying to help. Changed plugs twice, cleaned air cleaner, looked at exhaust, fuel tank had no water, seems think filter would not be a problem, cleaned throttle body, checked value clearance- no change needed.

Need helpful suggestions. I am guessing maybe computer or fuel pump?
 
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DG Rider

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Pull the injector to see if it's leaking.(smell oil for gas as well)
Have him test the coolant temp sensor and air intake temp sensor against the specs.
 
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wrhii

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We both replaced them. When I took them out top was clean one one side was dark with carbon and/or oil.
I may have missed some of this thread, sorry. My 2019 1000 acted similar. Almost always a cold start, but no hot start. If it did, it sputter and quit. So, listen for the fuel pump to cycle when ignition is first turned on. Check for fuel pressure at the injector. If you have neither, then find and check for power at the pump. If you have power then replace the pump. Fyi, both 1000 and 700s take the same pump and Honda issued a recall right after I replaced mine:(. One other thing, while I was trying to diagnose my 45 hour old machine, if I cycled the key repeatedly sometimes I could get the pump to run on a hot restart. The machine would continue to operate fine once you got it running.
 
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BigMac

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Sep 22, 2015
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I would see what kinda psi the pump is putting out. Also did the old plugs look dry or wet with fuel?
Thank you.

Not sure I have heard pump in long time. I here something click on and leave key on 10 seconds or more starts then let blinking light extinguish then drive off then if shut off or it may die at idle.
Then may not start at all till cools down. Only shows 2 bars on heat gage.
Also does not cycle the radiator fan as much as before and had some issues with panel locking up saying it was too hot when engine was cool to touch. Happen 3 times and either unlplugged computer or took ground wire off then it started.
 

wrhii

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Thank you.

Not sure I have heard pump in long time. I here something click on and leave key on 10 seconds or more starts then let blinking light extinguish then drive off then if shut off or it may die at idle.
Then may not start at all till cools down. Only shows 2 bars on heat gage.
Also does not cycle the radiator fan as much as before and had some issues with panel locking up saying it was too hot when engine was cool to touch. Happen 3 times and either unlplugged computer or took ground wire off then it started.
Wow seems to be a lot going on then. Get the service manual and follow the diagnostic flow chart. A volt/ ohm meter is about all you'll need for now. Also pull the flash codes(procedure in the manual).
 

HondaTech

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I may have missed some of this thread, sorry. My 2019 1000 acted similar. Almost always a cold start, but no hot start. If it did, it sputter and quit. So, listen for the fuel pump to cycle when ignition is first turned on. Check for fuel pressure at the injector. If you have neither, then find and check for power at the pump. If you have power then replace the pump. Fyi, both 1000 and 700s take the same pump and Honda issued a recall right after I replaced mine:(. One other thing, while I was trying to diagnose my 45 hour old machine, if I cycled the key repeatedly sometimes I could get the pump to run on a hot restart. The machine would continue to operate fine once you got it running.
Honda should reimburse you for this, it's usually mentioned in the customer letter on recalls.
 
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Slackjaw

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wrhii

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Honda should reimburse you for this, it's usually mentioned in the customer letter on recalls.
I appreciate ya being in the group, looking out for us @HondaTech 👍 :cool:. Dealer agreed to "recall original pump" and replaced it . After we verified that the pump I bought outright was in fact the updated unit. I just have a spare pump on the shelf that fits multiple units. No problems with my guys, they r a pretty good bunch of fellas.
 
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BigMac

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I appreciate ya being in the group, looking out for us @HondaTech 👍 :cool:. Dealer agreed to "recall original pump" and replaced it . After we verified that the pump I bought outright was in fact the updated unit. I just have a spare pump on the shelf that fits multiple units. No problems with my guys, they r a pretty good bunch of fellas.
The recall does not apply here. Pioneer 700 SXS700M2 model year 2016. VIN 1HFVE0220G4200696. Engine No. CE01E-8313721. Great suggestions. I plan to pass them on next week to the mechanic Mr. Cook.

It has been a very reliable machine. When extremely cold I think and glue on engine preheater would help it start and definitely needs warmed up for transmission in winter. I have never had to assist to get it unstuck but has been up to rails in crossing ditches on ranch. Also great helper while checking on calving, fencing, hauling feed and sick calves in the trunk or front.
 

wrhii

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View attachment 230781

The recall does not apply here. Pioneer 700 SXS700M2 model year 2016. VIN 1HFVE0220G4200696. Engine No. CE01E-8313721. Great suggestions. I plan to pass them on next week to the mechanic Mr. Cook.

It has been a very reliable machine. When extremely cold I think and glue on engine preheater would help it start and definitely needs warmed up for transmission in winter. I have never had to assist to get it unstuck but has been up to rails in crossing ditches on ranch. Also great helper while checking on calving, fencing, hauling feed and sick calves in the trunk or front.
I agree that the recall doesn't apply but some of the symptoms do. On mine, it seemed as though there was a bad spot in the pump windings. We've got a 15 700 now that the fuel pump won't run at key on, have to cycle the key several times before it'll start. Gotta try and diagnose it next week. In your second post, you gave many more symptoms that lead to wiring issues maybe. The ranch has 5 of these things this forum tries to help me keep running. Ranch life is hard on these machines too. Good luck, and by all means sir, let us know what ya find. 👍 :cool:
 

Slackjaw

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I agree that the recall doesn't apply but some of the symptoms do. On mine, it seemed as though there was a bad spot in the pump windings. We've got a 15 700 now that the fuel pump won't run at key on, have to cycle the key several times before it'll start. Gotta try and diagnose it next week. In your second post, you gave many more symptoms that lead to wiring issues maybe. The ranch has 5 of these things this forum tries to help me keep running. Ranch life is hard on these machines too. Good luck, and by all means sir, let us know what ya find. 👍 :cool:

That describes a faulty fuel pump relay.
Not uncommon on the Rincons.
 
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BigMac

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Sep 22, 2015
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Forwarding suggestions to mechanic today. I also noticed that Idle air control value is noted on hard starting and stalling in trouble shooting sections of the 2014 service manual I saw on Honda SXS site.
 

CID

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I've had a FI motorcycle and my Talon have hard hot starts - both have responded well to WFO throttle when starting. That would imply an overly rich starting map (known on the Talon) flooding on hot starts; when you add in my high altitudes (frequently over 10k feet), you get hot start flooding.
 
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