hey guys...
a little history first. i have been chasing a fluctuating idle. Clay suggested it may be the EBPS. I wish i had AE, but will after tax return time. Anyway started trouble shooting the circuit and reading as much as i could about it. Cleared all codes(unhooked batteries) and still came up with p0470. I was looking into one of those eliminators for the sensor.
yesterday i spoke to Bill at dfuser. as we were talking i was picking his brain about the sensor and he said the sensor actually measures pressure(of course) but that value should be the same or close to the MAP pressure from the intake spider. he has a "bypass" that completely bypasses the tube and the sensor is t-ed into the MAP line. I looked at the pic and thought...i can make that.
last night went out to hardware store and bought a 1/8 npt tee fitting, 2 1/8 npt x 1/4 air hose barbs and a 1/4 npt cap for the manifold. put it all together last night, cleared codes, and still get p0470(with just key on, engine isnt even running) so i think the sensor is bad, either from cleaning or age. drove truck today, ran fine no SES but i dont have any long term data yet or AE data to prove it.
Sorry so winded...what do you guys think? will this work? i should have AE in a month or so so i can give a more "real life" data. but till then, let me know thoughts suggestions or changes.
thanks...
chris

 

Po470 is the sensor on the front of the motor mounted to the tube, replace it or put the painless wiring eliminator on it, Auto Zone can get it. What you rigged up to map sensor tube i never heard of, if you still have the code get the eliminator.

 

KOEO a good EBPS will read 14.7 PSI at sea level same as the MAP when reading absolute manifold pressure.

I personally want a working EBPS. During live tuning the first thing Jody checked for was to see if my EBPS was working. He checks EBP and Boost while tuning. EBP and Boost give a good idea of cylinder pressure.

 

so if thats true... then why cant it be t-ed into the MAP line and remove the tube that gives so many of us fits? i understand the sensor has to work properly, and i have one on order to see if it makes a difference, but if it reads map...y now tap into the line?

 

check this out...this is the one from dfuser...now dieselstorm

94-03 7.3L Powerstroke Exhaust Back-pressure Sensor Eliminator with over-boost controller [EBPSE-3] - $159.99 : DieselStorm Technologies, Parts, and Accessories

maybe the pic will give a better idea

 

The EBP on a stock turbo is almost 2:1 compared to boost levels, so when you're pushing 20psi boost, your EBP is around 40. If you up the a/r on the exhaust side, it lowers the ratio and gets closer to a 1:1, but you loose some low end spool up.

 

that makes sense from what i have read. im going to get a new sensor and run it this way for a little while and report back in a little...

 

The EBP to boost pressure is almost a 2:1 ratio so if you are using boost pressure it isn't going to be the same. Personally that seems like alot of money for a metered boost leak and one more thing in the way on your engine. You can replace the EBPS and tube from Ed for about $110 I think. Doesn't seem like much of a problem if you only have to do I every 8-10 years.

Edit: Trevor beat me to it.

 

It doesn't read MAP. It reads the EBP. With the key on engine off both the EBP sensor and MAP sensor should see the same pressure which should equal the BARO. With engine running they will read differently according to engine load.

 

ok guys...you are the pros. thanks for the imput...maybe ill just get the tube then too

 

What I was trying to explain was a way to test the EBPS by comparing it's reading to MAP sensor reading with engine off.

The tube could be good and only need cleaning.

 

Great idea though! Thinking outside of the box is how things are invented.

 

the tube came off in 2 pieces yesterday...so new tube it is

i was hoping that it would work...i feel i dont contribute as much as most and am just trying to do my fair share. i may keep the parts and when i get AE from clay, do a real test and see. thanks for the input...i dont mine constructive criticism

 

It wasn't my intent to be critical. I didn't read anything to be ctitcal about. Just trying to explain the EBP sensor and a comparaive test.

 

NO!!! i didnt take it as that...i thought i might have had a good idea. i knew posting it would help. you guys are the pros...im still learning these engines. im good at fabricating and working, just not great at the fundamentals of the motor yet. i didnt think you were critical...i was just saying i dont mind having others chime in to either make something better or steer me in the right direction. i appreciate all your help, because i have read many posts you have posted, i have done things that you told others. again...it wasnt ment as an insult or put down. so im out 5 bucks and 45 minutes of time...no biggy. but i did learn a little more about the engines.