Today I was driving the truck back from work. I took off at a stop sign and noticed it was taking longer to get up to speed than normal. At the next stop sign I revved it up and it wouldn't go past 2000 rpm. It was billowing white smoke at 2000 rpm. I took off and every gear it wouldn't rev past 2000 rpm. I'm thinking it's the injectors but not sure. Any idea what it could be?

 

Check the uvch to make sure none of the connectors are loose.

 

How does it idle?
I'm thinking bad uvch or HPO leak.
Let it sit over night and rev it on a cold start. If it goes past 2k then you have a HPO leak

 

It idles fine. I'll check the uvch in the morning. I've changed them all out 5 months ago. I let the truck sit for a few hours and I took it down the road and ran fine. I turned around and it started acting up again

 

That sounds like HPO leak. When the oil is cold it thicker and can build pressure better. After it warms it thins causing oil to blow pass the injector orings

 

What color is the fuel in the fuel bowl ?

 

And is the fuel filter media tan or black?

 

I started the truck up today and was idling fine. Took it down the road and it ran good. Checked the fuel bowl and the filter is dark. I changed the filter out 6 months ago

 

Injector orings are shot

 

Is there an average life span on them? or a rule to replace every 100k?

 

Not so much an average, but some OE factory installed injectors I have pulled have gone 300+k miles on one set of orings. Alliant had a QC issue back in late 2012 where rings were going within 10k...that has since been resolved and they should last you well past 100 if not 200k. I lost mine at 112k on my truck on the factory set.... It corresponds to quality fuel and oil on proper intervals more than anything IMO...thats just my opinion!

 

I just changed the o rings in September. I've only put 2000 miles on the truck since.

 

Well replace the fuel filter with an OE cap and filter and see if its black within a week or two. A pinched ring will do this fairly quick.

Are you consuming oil? You would have to be consuming/bypassing quite a bit of oil pass the rings into the fuel for it to affect the trucks performance that quick if the HPO will not maintain.

What is your fuel pressure?

I'd check the UVCH as well. considering you did them recently a wire may have been pinched or something finally frayed and shorted out. The white smoke and miss/low power is typical when a UVCH is failing/shorting.


A very easy test to confirm your upper orings are sealed is pull the valve covers off and run the truck till its warm, inspect each injector to see if oil is bypassing the upper ring and spewing over into the top side of the head. This will confirm or eliminate the top rings for being the case, if the fuel filter turns dark quickly, this will confirm the lower rings being bad.... along with quite a bit of oil consumption, and trust me its noticeable....

 

Where did you get the orings ?

 

I ordered the o rings off of rock auto. They're motorcraft brand. I changed the ipr and it didn't change anything. I checked the fuel filter today and was spots of black on it. I changed the filter 3 days ago