Join Date: Feb 2014
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Newb ?'s about up-pipes/boost leak
Quick backstory: I’m still very much a newb when it comes to diesels. I purchased a 100% stock 2003 F-250 in March, and it didn't take but hooking up my 7,000lb boat one time to be extremely underwhelmed by its performance (7 MPG at 65 MPH on the interstate). I know these engines are capable of better performance than that, so I started reading up on and checking the most obvious culprits first (Changed filters, cleaned EBP tube and sensor, etc.). I also took it to a reputable mechanic to look it over, and he told me that my IDM was weak and he also pointed out an obvious boot leak on my driver’s side up pipe at the Y collector. After replacing the IDM, I purchased some bellowed up pipes and a boost gauge and tackled that project this weekend.
I installed the boost gauge Friday afternoon (Tee’d into the MAP line) because I wanted a before and after the up pipes comparison of the boost reading. I maxed out at 12 PSI unloaded before installing the up pipes. After a long and miserable weekend I finally finished up the install. While I was in there, I went ahead and installed some of Riff Raff’s plenum reinforcements, some Riff Raff CAC boots, and the upgraded clamps. Fired the truck up after I was done and everything seemed to be normal; no smoke, no CEL, nothing out of the ordinary. After taking it on a test drive, about 14 PSI is the most I saw on the boost gauge, and I hear a whooshing type air noise while under a load that I don’t recall hearing before. I can’t duplicate it in neutral revving, and I can’t hear anything at Idle. The best way I can describe it is like a BOV type sound but constant while under acceleration. I know these trucks don’t have a BOV, it’s just that type of sound. It is most definitely not the normal EPB sound.
So here are my questions: Beyond the obvious double checking all of the connections and clamps, can anyone offer any thoughts or opinions on other things I should probably check while I’m at it? I know it sounds like it would be air leaking from somewhere, but is it possible I could have bumped something else loose? Also, I've read a lot of conflicting information about what the max stock PSI is on these trucks; can anyone tell me what I should realistically be seeing with the pedal floored climbing a decent sized hill in an unloaded stock truck? Thanks in advance!!!