Towing Problem

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Sep 3, 2015 | 09:24 PM

Russcarter32

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Towing Problem

I bought a 2006 F-350 4WD Lariat SRW with a little over 200,000 miles on it. The truck seems to run perfectly, except when pulling a load (9,000-10,000 lbs) down the interstate/highway. Sometimes, when pulling above 65-70 mph for an extended period of time (45 minutes to an hour) the truck will all of a sudden idle down and won't get above 2300-2500 RPMs (even if you put it in neutral and floor it). It's not enough to shut it down, but it won't let the truck accelerate as fast as normal. Killing the truck and cranking it back makes it go back to running normal for a little while, but the periods of it acting up get shorter after each killing and restarting. I took it to the Ford place while it was acting up, and they thought it was a turbo problem. They cleaned the turbo and said everything looked fine, but the same problem arose after leaving the shop. They've been stumped at 3 different Ford shops, but one said there's a 95% chance a new turbo would fix the problem. Any ideas what might be wrong?

Sep 3, 2015 | 09:39 PM

KIDkiser

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Joined: Jun 2011

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From: Kentucky

Is the wrench light coming on in the dash.sounds like it's going in limp mode

Sep 3, 2015 | 09:42 PM

Russcarter32

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No lights or messages come on. The guy I bought it from told me the truck was 'bone stock', but that turned out to be a lie because it had the egr delete.

Sep 4, 2015 | 06:26 AM

white Buffalo

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From: Sioux Falls, SD

What were your Engine Coolant and oil temps when she starts to limp?

Sep 4, 2015 | 07:29 AM

Russcarter32

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Everything on the dash showed normal.

Sep 4, 2015 | 10:08 AM

mhoefer

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From: BC Canada

You need some form of digital gauges. Water and oil temp delta? FICMS voltages, true battery voltage, it does sound like limp mode. High temps, delta of the oil and coolant will force limp mode. You may not have a warning light but there has to be codes that will point you in the correct direction.