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My E450 Ford super duty starts but only runs at about 200…

My E450 Ford super...

My E450 Ford super duty starts but only runs at about 200 rpm. this is a V-10 on a motorhome. You can push on the gas but no response. after a while I am able to get it to rev up.

Mechanic's Assistant: Has the vehicle turned into a gas hog? And how does it start -- same as usual?

No

Mechanic's Assistant: Are you fixing your E150 yourself? What have you tried so far?

I am not fixing it myself. We just bought this motorhome and everything worked fine when we drove it home. after sitting in the drive for a few days I went to start it and it would not fire up right away. I just wanted to see if anyone out there ran into this problem and what they needed to do to fix.

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Answered in 6 hours by:
5/30/2018
Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 53,439
Experience: 16 years experience
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What year model?

Any warning lights on while running?

Does this low rpm occur on every start cold and hot?

How long must it run to run well?

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Customer reply replied 2 months ago
2006 Ford E450. No warning lights. When it starts it is barely running, This goes on for 3 or 4 times before it seems to warm up enough to rev up to normal. This happens on cold starts only. It runs fine after this.

I feel like in your case the MAF and throttle need to be cleaned as a first attempt in addressing this concern. If that does not help next we need to monitor the fuel pressure on a cold start. Can you do those?

You now will see a rating scale a row of yellow stars from bad to excellent, because I have posted my 1st full/partial answer. When you rate I get a portion of the deposit you made, no rating means you still paid, but I earn nothing. My goal is understanding your question, and addressing it in full detail. In return, receiving a 5-star rating. Rating does not close the post or stop the conversation. Please keep in contact and reply as much as needed. Thanks, Chris

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Customer reply replied 2 months ago
If the MAF and throttle need to be cleaned wouldn't the engine not function properly after it's warmed up as well? Same as for fuel pressure. I guess my question is whether or not this is a common problem with this type of V-10 engine?

This is not a common issue. Once running things can change from heat, vibration, and parts moving.

Chris (aka- Moose)
Chris (aka- Moose), Technician
Category: Ford
Satisfied Customers: 53,439
Experience: 16 years experience
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