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post #1 of 7 Old 09-23-2011, 09:39 AM Thread Starter
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runaway idle

1998 ford E-350 7.3 diesel ambulance.start engine runs normal for about 10 seconds then the idle goes up until its screaming.checked for vacuum leaks
and found none. e-brake off and in park.
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post #2 of 7 Old 09-23-2011, 03:05 PM
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Disconnect the TPS, perhaps it's stuck.

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post #3 of 7 Old 09-23-2011, 03:13 PM
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Quote:
Originally Posted by JSchuricht View Post
Disconnect the TPS, perhaps it's stuck.
Agree. Other then that I'm stumped.

Allen
1999.5 F-350 7.3, six-speeed

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"Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin

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post #4 of 7 Old 10-06-2011, 04:56 PM
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oil leak ?

I had a turbo fail on a off brand not a 7.3l but oil leaking into intake caused the exact problem describing , I have a 01 E450 7.3l not fun for working on, check compressor outlet for oil.

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post #5 of 7 Old 10-09-2011, 03:59 AM Thread Starter
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I have found it to be electrical.amulance pcm requires alt voltage or it raises idle to 3000 rpms. alt dead will replace and see what happens
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post #6 of 7 Old 10-09-2011, 12:03 PM
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Wow, thats weird, I've never heard of that.

Allen
1999.5 F-350 7.3, six-speeed

If Canada was that great, it would be a state...

When seconds count, the police are just minutes away.

"Those who would give up essential liberty to purchase a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin

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post #7 of 7 Old 10-09-2011, 12:15 PM
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Makes sense though. That should have the AIC (auxiliary idle control) and it makes the engine keep certain voltage on demand. It can be changed I'm sure.
Should have dual alternators too.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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