something is not right - Ford Powerstroke Diesel Forum
6.4L Performance Parts Discussion What has or has not worked for you?

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post #1 of 4 Old 12-30-2010, 06:30 PM Thread Starter
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something is not right

My exhaust back pressure is way higher than normal. 310 tune was hitting 58 lbs of boost. Dropped to the 250 tune. Boost was normal but the back pressure was still high. Dropped to the 150 tune. Boost at 50 mph cruising down the road was 20lbs, EBP in the high 60s. Not towing just driving flat roads. Just doesn't feel right. Seems to be struggling. Only 23k on the truck. Mostly driven on the 250. Any ideas?

2008 F-250 6.4 Auto, CC,SB,FX4, 2" lift, 285/65/20, Spartan tuning, Elite studs, Elite egr delete/wastegate, Elite push rods, Spearco Intercooler, cold side pipe,CFM, 4"down pipe,Custom 5" DP back exhuast 543HP/1231 ft-lbs
Everything from Sean at Street diesel performance
http://s601.photobucket.com/albums/t...0Ford%20F-250/
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post #2 of 4 Old 12-30-2010, 08:24 PM
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Sounds like you may have a bad back pressure sensor. Monitor barometric pressure as well as exhaust back pressure. Turn the key over without cranking. Both barometric pressure and exhaust back pressure should be the same. If the EBP reading is higher than barometric, your sensor is probably bad. The tunes that cycle the EGR all the time (150) will have higher boost, but your back pressure should be lower with the valve cycling all the time. I'm almost positive that your EBP sensor is bad.

Jeff Dodd
spartan_jeff12@yahoo.com

2012 Ford F-250 Lariat CC/SB

Mods - Spartan tuned via laptop, 4" AFE stainless exhaust system, 2.5" PMF BMC leveling spacers, 3" PMF lift blocks, Fox Racing 2.0 shocks, Recon smoked mirror & cab lights
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post #3 of 4 Old 12-31-2010, 02:02 PM Thread Starter
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Thanks, will check it out.

2008 F-250 6.4 Auto, CC,SB,FX4, 2" lift, 285/65/20, Spartan tuning, Elite studs, Elite egr delete/wastegate, Elite push rods, Spearco Intercooler, cold side pipe,CFM, 4"down pipe,Custom 5" DP back exhuast 543HP/1231 ft-lbs
Everything from Sean at Street diesel performance
http://s601.photobucket.com/albums/t...0Ford%20F-250/
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post #4 of 4 Old 01-01-2011, 06:18 PM Thread Starter
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baro 14.6 EBP 15 key on not running.

Dropped to the stock delete tune. Same deal. Load the 250 which is the tune I use for most everything. Running perfect, shifting great. Anything above or below runs like crap. Guess I will be leaving this tune in for a while

2008 F-250 6.4 Auto, CC,SB,FX4, 2" lift, 285/65/20, Spartan tuning, Elite studs, Elite egr delete/wastegate, Elite push rods, Spearco Intercooler, cold side pipe,CFM, 4"down pipe,Custom 5" DP back exhuast 543HP/1231 ft-lbs
Everything from Sean at Street diesel performance
http://s601.photobucket.com/albums/t...0Ford%20F-250/
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