Hi All,

First, thanks for all the help, so far, you all have been a big help.

I'm still having issues with this truck, though, and it has become an obsession with me. My wife is getting impatient.(I still love you, honey, promise, it's just this new girl needs a lot of attention.)

So, after a lot of work on it, I now have EBP issues.
I replaced the EBP with a new one due to P0470 codes, those went away after the replacement... for a while. Then, they started coming back sporadically. I would still get a P0470 but I'd clear it, drive on. It was driving sooooo good, even on the interstate, 70 - 80 mph. Mileage was great.

On the way back home from the Clemson game Sat nite at about 70mph on I-85 headed north (bad omen, I know), it had a big miss/bump/stall right around the hwy 291 exit, then the turbo started farting big time. It would cycle back and forth VGT going from 85 to around 50, fart big time each cycle, EBP got stuck at 36psi. Smokin' like I was spraying for mosquitoes.

I got off the interstate, white knuckle drive back home, slowly. Got home, checked codes, I had P0299, not surprised there with the turbo acting the way it did, P0470 and P0472, both EBP related. Also have a #3 glow plug code(P0673 I think?) , that's either a ghost code or I need to check the wiring or plug itself. Not related to this issue, though.

Baro was constant, 14.4 in my area, MAP depended on boost, matched baro+boost. EBP was hosed.

I thought maybe it was just a bad EBP connection so I put the new pigtail on that came with the new EBP sensor. It didn't help. EBP still steady at 36psi, no matter cold, hot, whatever.

I had already thrown away the old EBP so I can't put it back in to see how it reads. (bad Jim, you know better than that, heck, I've kept everything else)

So, I'm thinking:
1. Bad new EBP sensor.
2. Something really stopping up exhaust.
3. Wiring issue past the point where I put in new pigtail.

I did take off the cat a few days ago, I had bought a test pipe but couldn't get it in, just a *hair* too big. Looking through the cat it looked clear. I suppose things could change, though and soot, or whatever could stop it up. Jeez, that was hard, old man was sore after that.

I suppose I'll just get another EBP sensor AND take the cat back off. Go from there.

Don't know how much more I can stand. (of course I always say that)

Your thoughts gents? They are appreciated.

 

KOEO. Read MAP BARO EBP

should be same
Post results

 

Thanks Blade,

KOEO:
BARO = 14.4
MAP = 14 (no decimal place on the scanner)
EBP = 36

EBP 36, constant, no matter what temp, rpm, whatever.

 

Are you using OEM or Chinese EBP. I know they are cheaper but ya know why.

 

Have you cleaned the tube feeding the sensor?
It needs a new sensor or the wire is shorted. Have a digital meter to read the plug? Have you checked the vref reading?

 

Exactly! I learned the hard way on ebay that just because they say OEM doesn't mean it is. The OEM EBP sensors have Made in Mexico on the plastic part. China is buying the OEM plastic part and the base then they put their cheap crap electronic part inside. These are then sold in bulk to the USA. I have seen them listed as true OEM part without the original packaging. Without original packaging is the dead giveaway. Only buy parts from ebay if they are in their original OEM packaging, whether it be Motorcraft or International. I ended up finding an International EBP sensor in its original package on ebay for around $15. It's been working just fine for over 6 months... the crap one lasted a week and a half.

 

Good question, don't know. Got it off fleabay. Probably Chinese. I'll find a motorcraft.

Funny thing, when I search for one for '05 it shows the one with the flare fitting on the EBP, mine has the NPT threads and the bracket that mounts on the thermostat cover.

 

Tube is clear, I checked that first.
I have a digital meter, not sure what you mean by vref reading, though.

 

I'll search for one of those... thanks for the input.

 

Bunch of them on ebay. 03 -04 navstar VT 365. Mine's a '05 but has the 1/8" pipe threads on the sensor instead of the flare fitting, I guess could be a early '05. Everything for an '05 has the flare fitting directly on the sensor.

Would the sensors for 03 - 04 have the same specs as an '05?

 

Oh, btw, after a lot of searching, I think it's called turbo "sneeze". Anyway, it's not a pleasant experience at highway speeds.

Signing off until in the morning. I'm knackered. Thank you all, input is great.

 

WatsonR was stating on Vref = voltage reference. You need something to read data to get that. ScanGage2, Toque Pro, ForScan, DashBoss. If you're going to do your own stuff or get an education you need one of these. I'm showing Vref on EBP at 0.91 KOEO. Not sure if that's correct, it's on a truck I'm working on now. WatsonR (Randy) is a pretty sharp individual that gets into the fine detail. Will save you a lot of wasted time and money.

 

Thanks for this. I have a Edge CTS on it, but I don't think EBP Vref is one of the PIDs, I'll look again.

I do have Torque Pro, a splitter and a bluetooth connnector so I can keep the CTS hooked up and run Torque Pro at the same time. I just haven't downloaded the definitions yet, will do so after work today.

I did go out before work this morning and disconnected the EBP, then KOEO:
BARO = 14.4
MAP = 14
EBP = 36

Could be wiring harness related? PCM? I did put a new pigtail/connector on it, but the problem could be elsewhere in the harness. Hope it isn't the PCM.

I don't think anything is wrong with the vgt or turbo, it seems to be responding to whatever signal it gets. Something has just finally failed big.

Is 36 PSI a default value sent by PCM if no EBP sensor is detected?

I'm still searching the web for EBP info.

 

First off,using anything other than Motorcraft parts on these trucks is a waste of time ,(except with proven mods). i always say "Cheap is cheap" There is a reason Aftermarket parts are less expensive than OEM,they work like new. I don't know about you but I hate to do a job twice,plus it can cause other issues with your truck and drive you really crazy trying to fix it.

 

The 03' had inferred EBP, yours should use the sensor. So EBP, BARO, MAP all should be 14.7 at KOEO. IF not, either the readings not programmed right or the sensors broken or the wires shorted.
KOEO:
BARO = 14.4
MAP = 14 (no decimal place on the scanner)
EBP = 36
EBP 36, constant, no matter what temp, rpm, whatever.

Tideman wrote; I'm showing Vref on EBP at 0.91 KOEO.

Check the EBP sensor against one of those other sensors with a digital meter and then find the short before spending any more money on sensors you don't need.

The turbo uses MAP and EBP to determine boost.... why your getting farts and P0299, the EBP is messed up and until you correct that, the turbo won't operate correctly.

There are sensors that take three wires, one wire is vref 5.0 volts, one ground and one that sends the corresponding feedback signal, like Tideman reported .91v represents 14.7psi when KOEO. In your case, its sending 36psi or +2.0v back... shorted.

In your case the wire should read 36psi = 2.229v or each volt is equal to 16.15 psi for the 5.0 volt reference.