Hi all, i've been lurking around here for a bit. I bought a 99 7.3 from original owner several years ago with 100k on it. Since then I added a chip, that was fine. My next add was a 4" AFE cold intake and this is when the problems started. ON any setting other than stock there was massive turbo cavitation. I added the 4" exhaust, a big head wastegate actuator, an slightly better turbo and none of that fixed the problem. Then I added a monster compressor wheel which fixed most of the problems.

Cavitation is now rare if at all. On stock the thing runs great but it's slow and gets poor full economy. On light tow the truck is drivable, full ecomomy is decent but the truck doesn't sound good at above 2700RPM and the problem is much worse on the full economy setting. On fuel economy setting the truck spools up super good until the RPMs get up then it sounds like its gonna blow up, check engine light comes on, etc. Is this truck not getting enough fuel/air. It sounds like its running out of fuel to me, almost like it's missing or the valves are floating out.

Any thought are appreciated! Truck is not lifted and is running 285's, also freshly rebuilt/built tranny.

 

E99 L99 ? I would suggest getting a ELM or the Good OBD LINK MX something you can Bluetooth to get some data on what your truck is doing. Torque pro is a great app. Forscan is a easy to use free app. But fairly/very limited. I would spend the $6 on TQPRO. The engine light is trying to tell you something this will tell you what the ECM is trying to tell you and guide you whats going on. It very well could be those darn in tank filters. Note the miles on this video. They would limit your top end fuel flow for sure. If I had a "only 1 guess" thats where I would start. And welcome to the 7.3 club and BUG

 

I (likely) know this one - P1211 trouble code. Your HPOP and your tune are in disagreement with each other. Is your tune 80 HP or more?

 

Also Tugly here is a rocket scientist compared to me when it comes to electronics. You can take his advise to the bank on whatever he has to say on the ECM and or Tq Pro.

 

Truck was built in 6/99 so not sure if early or late.

Coverage for 1999 - 2003 F-Series 7.3L Powerstroke
Up to 111.5 horsepower & 205.0 lb-ft of torque at the rear wheels

 

With a stock HPOP and injectors you are very limited in HP. You will actually only see a 60 HP gain, at most, out of that set-up. Who is the Tuner from?

 

https://www.ford-trucks.com/forums/1...-99-7-3-a.html

As it says above look at your axle and trans cooler.

 

Any idea how much boost youre making? It will defuel over 22 lbs

 

I do believe that anything after February '99 or so is late '99 so everything on it should be interchangeable up to 2003 when they quit installing the 7.3.

 

12/6/98 is the date early '99 engine production ended. Late '99 began 12/7/98. Other parts of the truck such as front suspension components didn't change until later.

 

flashpaq 1840 from Superchips.

 

First thing I would do is get a scan tool on there to read the code(s). It will likely point you in the right direction.

It sounds like you were experiencing turbo surge, which is very common with a stock turbo and tuner. The ported compressor housing normally clears this up. Some have had luck eliminating it with the WW, but that is not a guarantee.

 

whats a WW? Wicked wheel? That's what fixed the cavitation. The problem now is the truck runs out of go go in upper RPMS, doesn't shift and just makes nice. The check engine light turns off after i get off the throttle and return to reasonable driving, would there still be a code? This only happens on fuel saving setting which is 80HP setting.

do I take it to a dealership to have this scan done?

 

to me it sounds like there could be over boosting (i think thats what its called??) going on where the truck is (IIRC) defueling its self...or at least the PCM is?? I could be off but thats what comes to my mind when I read your posts about whats going on....also whats the programme that is being used in the video? is that the Forscan (geez that name conjures many odd thoughts)....????

 

Sounds like your running out of fuel, also check for codes, a failing idm can cause lose in power, a sticky ipr, a weak hpop and injector orings can all have an inpact on fuel economy, and driveability.