02' F450 7.3 - Ford Powerstroke Diesel Forum
 
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post #1 of 7 Old 12-12-2011, 02:16 AM Thread Starter
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02' F450 7.3

Hey i've got a 2002 F450 7.3, lately i've noticed a huge drop in mpg, I was getting 14-15 which I always thought was great and has now dropped over the last couple weeks 9-11
The only noticeable sign of it not running perfect would be sometimes the truck seems real rough on the highway or when going from a stop, used to be really smooth and powerful but now it feels like i'm on a bumpy road if that makes any sense.
Also the truck has 180k miles on it.

So far i've checked the basics, air filter, fuel filter, oil change I keep up every 5k. I took it to my mechanic and he asked me the year make model miles and instantly told me my injectors were going out without even looking at the truck.

With it riding rough from start what would be the next place to check or should I go ahead and start looking to buy injectors and not waste anymore time?

Thanks for the help
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post #2 of 7 Old 12-12-2011, 05:06 AM
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Could be any number of things from the cps sensor to a leak some where
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post #3 of 7 Old 12-12-2011, 05:33 AM
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He wouldn't be my mechanic any longer, that's for sure.
Could be a cam pos sensor (CPS.) The UVCHs could be coming loose.
Do some quick searches on those and you'll find what to check.
After that you need to get it scanned for problems unless you wanna keep guessing.


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post #4 of 7 Old 12-12-2011, 07:47 AM
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Winter blend fuel is probably the culprit! Combined with something else

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post #5 of 7 Old 12-12-2011, 10:41 AM Thread Starter
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scanned

Does getting it scanned help even if i'm getting no engine lights?

Also pretty much any mechanic can do this right? or would I be better off going to the dealership.

The truck has had NO stalling out or sputtering or anything like that it seems to drive fairly good other than a rough idle or just overall rough driving and the gas mileage dropping to crap. I do drive easy on it too

I looked up the CPS and that looks like a really cheap easy test as its only like 25 bucks to fix myself so i'll go ahead and replace that even though the symptoms of a CPS arent really matching my problem and take it to get the scan done after that
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post #6 of 7 Old 12-12-2011, 10:42 AM Thread Starter
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fuel

Oh also wanted to mention i dont think its anything to do with the cold as its been going on for about 3-4 weeks and i'm down here in Houston Tx. 3 weeks ago it was actually pretty warm, it has chilled up in the last week or two but started before that.
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post #7 of 7 Old 12-16-2011, 04:36 PM
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[/B]
Quote:
Originally Posted by cclucky04 View Post
Does getting it scanned help even if i'm getting no engine lights?

Also pretty much any mechanic can do this right? or would I be better off going to the dealership. May need to take it to a dealer

The truck has had NO stalling out or sputtering or anything like that it seems to drive fairly good other than a rough idle or just overall rough driving and the gas mileage dropping to crap. I do drive easy on it too

I looked up the CPS and that looks like a really cheap easy test as its only like 25 bucks to fix myself so i'll go ahead and replace that even though the symptoms of a CPS arent really matching my problem and take it to get the scan done after that
Could try unplugging the ICP sensor to see if it runs better if it does that could be your problem
take a look at the red txt
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