Hey everyone,

Has anyone had this problem before, when im in park and Rev the engine to around 2,000 rpm it bogs down with a bunch of white smoke( it smells like diesel ). Also when im cruisng around 60km/h at low rpm, then step on it does the same thing. Loses power for a couple seconds, fluttering and blowing out a bunch of white smoke, then once it opens up, its totally clear.

I just had the injectors done, turbo leak fixed and a new Turbo back pressure Sensor installed to see if any of that would fix the issue because the mechanic had no idea. I had a compression test done and all cylinders are holding at 450 psi with 488,000 kms on the engine.

Anyhow I just unhooked the batteries and hooked them back up. The issue was completely gone! Truck ran like a dream.. for about 10 minutes, then the issue came back.

Please can anyone recommend anything for me to try? View attachment 779007

Codes?

Google Ford superduty diagnostics on the cheap. You'll need to monitor the vital signs. Seems to point at injectors though

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Absolutely no codes or engine light. I'll give the Ford Diagnostics a shot.

I litterally just replaced the injectors and valve cover gaskets with new wiring harnesses for the injectors.

I'm gonna try replacing the CPS sensor and see if that works, I'm leaning towards something electrical

 

The issue was happening before I had the injectors replaced and the UCVH. The UVCH is from Ford.. was hoping the injectors and UVCH would fix it because it wasn't a cheap bill. I've driven the truck for atleast a good 3 hours now so the air should be out of the system.

The only thing that has fixed it was unhooking the batteries and reconnecting them to reset everything. Works for about 10 minutes of driving then goes back to sputtering out white unburnt diesel fuel when I step down on the pedal.

I'm ordering a new CPS sensor to see if that works

 

For those that missed it, this truck has 302,000 miles on it.

White smoke is always "insufficient combustion" which is low compression (your compression is fine), OR lack of fuel supply.

Based on the "no codes", and the list of things that have been done that made no improvement, my hunch are that the in-tank filter / screens are plugged.

EDIT/ADD: A simple diagnostic is to obtain a piece of fuel hose and external container of fuel. Remove the supply line from the pump (inside the frame rail, under the driver's feet) and install your external source. If the condition goes away, drop the tank (or lift the bed) and fix the screens/pick-up foot.

I can not explain why it "improves for 10 minutes" after the battery is disconnected. That doesn't make any sense if it is the screens. But white smoke is still incomplete combustion. Lack of fuel, or lack of heat (low compression or cold engine components).

 

Thank you so much for your Response Dave. Lack of fuel supply is actually the second thing I was going to look into and being as the truck has quite a few miles/kms on it.. most definitely could be the source. Like you said it's very odd as to why the engine is totally fine after reconnecting batteries, which is why I'm leaning towards electrical currently.. if the CPS sensor doesn't fix it then I will definitely start looking into the tank screens and replacing those next.

I've done quite a bit of research on this truck(I've only had it for about 8 months) so I've come down to either a CPS sensor or lack of fuel getting to the engine. Ive listed below as why I think it could be the sensor as I'm experiencing both symptoms.

Other CPS 7.3 Powerstroke symptoms include:

• Sudden loss of your 7.3’s fuel economy/MPG
• A noticeable “hiccup” during acceleration.

 

Suggestion..
I noticed you said autostore cps...
Keep in mind that almost everyone will also tell you this..
When it comes to sensors on these engines use Motorcraft or Navistar International parts only from a reputable source or you will be doing the job again. There are a few exception on the previously mentioned, emphasis on very few...
The tolerances for the other parts and quality just will not cut it.
Also check your connections and up from connections on the tails for wear and cracks under the loom. Problems have been found there as well. Check under the bundle going into the driver side cover for wear as it is also a common problem area.

Stop throwing parts and get FORScan as auto parts store scanners do not cut it. FORScan is just short of taking it to the Stealership.

EDIT....
You can have codes without lights.

 

Check your fuel pressure. You could have plugged filter socks in your tank, or cracks in the pickup assembly.

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