First post ever...:

Ok here it is... I have an early 99 f-350 I purchased last Feb... Truck has 130k, shortbed, hypermax aftermarket turbo, swamps 6 position tuner, mbrp dual exhaust, new trans... Very clean truck that is what was done before I bought it... I believe injectors are stock I know they are split shot not sure if when previous owner did turbo if they are still stock or not...??? I basically care about keeping running long and strong... Not particular to performance extras...etc

I have kept up on the oil and fuel filter prob over kill but wanted to make sure it was taken care of... This winter I started having battery issues replaced them and the alternator plus pulleys and belt, plus ac fan clutch pulley... I hate squeaks if they are not necessary...

Replaced battery terminals and cable... Had a pretty rough cold winter and some cold no starts draining the battery prior to replacing... Decided to drop truck off at mechanic to do a once over... Prior to dropping off ran AE low ICP and low IPR duty cycle plus exhaust back pressure sensor was no good... Had mechanic replace ICP, IPR and Exhaust Back Pressure Sensor... Replaced EBP tube 6 months ago... Plus a new fuel filter this time around...oil is good only 2k on it...

So went to shop to pick up give a test drive and driveability was terrible... It acted as if it was fuel starved and would bog down when shifting automatic trans... The rpms would drop for a second and would sputter for a second but go back up... It was driving like the EBP was was unplugged... I know what that is like because I unplugged it previously because I was told by a friend I didn't need it with my turbo but I guess I did... Got a new EBP sensor thinking it was a bad new one but no change...I know wastegate is different with hypermax turbo...not sure about EBP...

Ran AE and what was coming up was Exhaust Back Pressure Performance... I have proper voltage, ambient psi around 14psi, however duty cycle underload does not show it is 0, which is strange to me the bad EBP was running 56psi ambient plus showing 0 duty cycle and a fault in AE...

Had a new Cam Shaft Sensor put in I had a grey and a grey was replaced... As well as at this point a Fuel Pressure Regulator...

Went back this evening test drive all sensors look good on live data, EBP still no duty cycle showing...however it is still driving as if the EBP is unplugged which is strange to me because I read voltage and psi....so drive ability is worse than it was without all new sensors... I am leaning toward something still with the EBP sensor giving or not giving right information some how... So I am stumped...

I plan on having chip taken out first to see if it is possibly faulty... I spoke with swamps and they said I could drive without chip/tuner with the hypermax turbo since I have split shot injectors... But I would know immediately when I start it up if it needed the tuner because it would be missing all over the place... Then look at wiring on EBP... Thoughts on this...

Buzz test good, contribution test injector 8 balance fault which could be the fact if stock injectors it would not have the larger/longer injector because I believe they did not start with longer injector for number 8 till 99.5... Next step would be wiring harness on injector then open valve cover to look at injectors...

Kinda stumped at this point, no check engine light ever...drove pretty well with old sensors and better than now... Only other thing in the equation is the possibility of air in oil from IPR change...HPOP reservoir full and good...

Previously the only driveabilty issue I had was between 1200-1500 rpm in overdrive light throttle the truck would kinda sputter... If I slowed down it was fine or if I put my foot in it fine... I would get little spurts of black smoke like it was too much fuel or not enough... Plus fuel economy was never great from first purchase... Average 10-11mpg sometimes worse sometimes better... I do have 35" tires which came on it so I know that is part mpg loss... I have a light foot so I think it is possible the tune is requesting more fuel and I push that out in those small puffs...no other smoking issues, no fuel leaks, strong powerful truck, glow plugs good,... I would be thrilled with 14-15mpg consistently...

So if I left anything out let me know...I would appreciate any incite the experts may... But I am stumped...plus a little less rich from all the new parts...

Thanks,

Blackpool

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Had a thought but not sure if it makes sense... The new hypermax turbo and tuner were on the truck before I bought it... Just not sure which order they were put on...If they had the tuner on before the new turbo that would be a problem because it would be tuned for the stock turbo... Possibly why I have the wastegate code...my thought is that if the tuner was on after the hypermax it would be tuned for the hypermax thus eliminating the code for the wastegate... Also maybe that is why I have an EBP code and driveability issues currently...Or am I way off base with this random thought???

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Code P0476 why would I be getting this code new EBP sensor and new tube... Alternate causes said EPR Exhaust Back Pressure Regulator... Not sure if this is same as EBP... Says EPR could be sticking upon acceleration etc... Thoughts anyone???

 

So before u took it into the shop u had no issues?

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Pretty much... I had the no start dead batteries... And when I ran AE before dropping off... ICP and IPR were low on psi and percentage once I got it running... ICP was only at 300 psi... Plus EBP sensor was bad voltage not reading and psi was 56... New ICP 500-700ish and new EBP sensor 14 at idle...

Only driveability issue was at the 1200-1500rpm in overdrive would get a slight sputter and a couple puffs of smoke holding it there once hitting 1800rpm or pushing foot hard it was fine...which drove me crazy because I felt like I was constantly changing driving to accommodate and stay out of that range either lower or higher was the goal...

So now it's throwing the P0476 with 2 new EBP sensors and new tube... The hydro max turbo doesn't have a wastegate per se... It's built in so I don't know if I have an a standard EPR or not... It drives now like it did when I unplugged the old bad EBP sensor... When I give it steady throttle from first to second it drops rpm for a second minimal rpm drop maybe a 200-300 rpm, but second to third gear substantial rpm drop at least 500 rpm... Those transitions are pretty quick and close so they are noticeable... Almost like it's going to stall for a second... Identical symptoms to what it was like with an unplugged EBP sensor but not as severe... Before with EBP sensor unplugged once I drove about 1/4-1/2miles it would start doing this but I would push lots of black smoke and it would sputter on spoil... However still have a huge amount of power... Best way to describe is it feels a clog and you need to give it more fuel to pass clog... But don't know where would clogged since all is new... Making me think something is sticking...

So it almost feels as though something is sticking when it is supposed to open and close so it is not making that smooth transition...

I really appreciate your comment...

Using two softwares Snap On and AE with Ford bundle to see if one picks up what one does not...

Any thoughts would be great... I am reaching at this point...

I am leaning toward something in EBP circuit or downline of that circuit which is dependent on it...but I am not a mechanic...

 

Ypur fuel filters are good and u have good fuel in it right

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Not even 10 miles New fuel filter... Winter fuel with diesel kleen additive to prevent gelling... 3/4 tank of fuel

 

Id take it right back to the shop

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Yeah it's still at shop not going to take until it's right... That's why I'm trying to get any insight before I take her home...I won't drive it the way it is just do the test drives and the testing when I go up there each time... Do you know much about hypermax turbo? I'm going to call swamps tomorrow since that is where turbo and tuner came from...missed them today... I have a strange feeling previous owner had tuner first tuned for stock turbo then got aftermarket turbo but did not get it retuned for new turbo... Almost like a valve is closing early or late or sticking like it's getting too much fuel or not enough when it shutters as above mentioned... But not sure why p0476 is coming up...

 

Do u have a bost regulator does your check engine light cone on if you get on it hard and I have a t4 setup with a s366 so not to sure about the hyper Max

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Yeah no regulator on it... No check engine light ever... Gonna call swamps Monday they might be able to give some insight but they prob just want reburn tuner... I just wondering on hypermax if there is an external valve or mechanical slide that might be sticking for back pressure regulation... I know no wastegate as traditional turbos have... with hypermax is internal used as a pulse channel to reduce backpressure and egt temps...thus increasing power and supposedly fuel economy...

 

Decided to take off tuner... Swamps said could be a bad tune...so truck is now drive able ...with the tuner it was shifting too fast I'd be in 3rd at 40mph thus causing a stutter lag rpm drop just terrible driveability... So without the tuner the truck drives pretty well...only issue I have currently is every now and the truck shifts hard If I don't have my foot in it in transition with a slight stutter lag... Trans shifts nice and hard and if I have my foot in it real smooth... Just have this slight fall on face if don't foot in it in transition... Not trans not working because the shift is hard...it's as if air in line maybe or fuel is maybe less than grand...when I picked up today topped off with Hess fuel about 15 gallons thinking maybe fuel wasn't great since truck was sitting at shop off and on for about 3 weeks and temps have been pretty rough here in MD...any thoughts on what might be causing this issue... Pretty sure I have splitting shot stock injectors which allows driving without tuner...swamps said I would know right away with an irratic idle if didn't have split shot or after market single shots... Like I said truck runs much better just this slight issue as described above... Been a long month and I might be over analysis in this but also I have never driven truck without tuner... I can def feel the difference with and without tuner... I have just put in pretty much all new sensors, icp, ipr, EBP, EBP tube, fuel pressure regulator, map sensor, fuel filter, oil still has a good 2,000 miles left on it (but might have to do that sooner than later if problem exists), new top turbo belt, new serp, new cam shaft sensor...

So any thoughts would be greatly appreciated...

Thanks,

Blackpool