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Old 03-27-2003, 08:46 PM
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Default F-250 7.3 PS Question

I have a 1999 F-250 with the 7.3 Powerstroke in it and am having a slight problem. I took it to a trusted mechanic who "kinda" works on diesels and he ran a test on it. The code it sent back was
"P0470-Exhaust Back Pressure Sensor Problem". At this point he wasn't really sure what that ment and advised me to take it to the dealer. I called them and gave them the code and they said that it could one of a few things. I guess what I am asking is has anyone else ever had this code come up and what was the problem? Any info would be greatly appreciated!
RAG-TAG

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Old 03-27-2003, 09:09 PM
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Default F-250 7.3 PS Question

try your question here:DieselStop Forum

28' Maxcat w/twin Honda 225's
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Old 03-27-2003, 09:40 PM
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Default F-250 7.3 PS Question

You could be under Engine Warranty. The warranty is 100,000 miles or 5 years. The exhaust back pressure regulator and sensor are specificly covered. Theres a $100 deductible.
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Old 03-28-2003, 05:41 AM
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Default F-250 7.3 PS Question

The code aside, what is the truck doing that got you to take it to a mechanic in the first place?

On the codes, here is a site (part of the Dieselstop page)that has them all http://www.thedieselstop.com/faq/949.../00diesel.php3 but more to the point. Go ahead and clear the code and see if it comes back. I noticed that when my CPS went bad (Early '99 7.3) it was throwing all sorts of codes, but when I cleared them only the ones that pointed at the real problem kept reappearing. Some codes never reappeared and had I paid attention to them in the first place I would have found myself replacing lots of expensive parts that were actually perfectly fine. By the way, might as well get yourself a spare CPS (Cam Positon Sensor) now so you'll have it when your's drops dead on you - which it will do.

Thom

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Old 03-28-2003, 12:17 PM
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Default F-250 7.3 PS Question

Kglinz,
I wish! It has 126K on it.

When I am driving along at around 40 and it eventually shifts into OD after a small hill etc and I am using very little throttle to maintain speed it starts "bucking" slightly. It acts like a gas with a bad plug wire. When you give it more throttle it stops bucking. It has gotten gradually worse over the past 2 months and is now doing it it drive and not always only when little throttle is necessary.

Also, yesterday I noticed my miles to empty guage is reading 0 even with ample fuel in it. I have had this in the past when I have driven through a tank and not shut the truck off when refueling and continued on. It reads 0 but after a couple of starts it will read again.

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Old 03-28-2003, 12:51 PM
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Default F-250 7.3 PS Question

I would definitly go to the Dieselstop page with that one. Those guys, at least some of them, are simply astounding at their ability to diagnose problems with these trucks, and haveing the code in hand will really help you out on this one plus the excellent description you are able to give of the problem. Also, and this has nothing to do with this page, you will see that an absolutly amazing number of people read posts on that board and respond - a good number of who are diesel mechanics and a good number of others who are owners of diesel speciality shops. Some of the information you get there is a bit on the technical side but for the most part it is more than simply excellent.

Thom

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Old 03-28-2003, 01:52 PM
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Default F-250 7.3 PS Question

Rag-Tag, also try

PSD webpage

click on the powerstroke diesel forum

post your problem there, they can probably help you.
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