Help!
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Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
Help!
I don't know how else to put it. I've been trying to figure out why my truck seems weak. Ive been through everything and my last resort were my injectors. So I sent those off and low an behold they said they were ok. At least not bad enough to cause the problems I'm having. So what now? My final symptoms are low power and icp and ipr numbers are off but only with tunes. It doesn't matter what tunes I'm on at wot my icp drops to 1700-1900 range and the ipr maxes out at 97% dc. So the real ? I have is where is the oil going? If my injectors are sealing and not leaking and I'm using a pump with known good numbers on another truck with AD's, what is happening? I'm bout to give up. I'm so discouraged that after all the time and money I've invested I'm no further along than when I first bought the truck except I can change just about anything on a 7.3 but what's that worth if I can't fix my own truck. I've got to be missing something. Please help! I hate to sound desperate but I am! Thanks!!
Posting Guru
Joined: Dec 2009
Posts: 2,265
Likes: 2
From: Garden City, KS
With my 15* pump, IIRC, I saw 2100PSI at 60% DC when I ran my cheap Superchips tunes. Man, I'm thinking O-rings and if that don't do it, then I'm thinking you've got something seriously wrong with your heads... cracked, maybe and bleeding the pressure off, back into the pan? I don't know... might be a stretch, but has anybody got a better idea? Oil's not in your fuel and it ain't getting burned off... where else could it go? It'd have to be slow enough that the HPOP could keep up in stock tunes, but fast enough to kill any performance tunes of any kind... unless your PCM is screwed. Have you got a PCM to try, Dave?
New User
Joined: Mar 2011
Posts: 3
Likes: 0
From: Mingo, OH
Two things come to mind - a bad/faulty IPR that doesn't fully close when the duty cycle is cranked up, and the less likely although possible cause of the internal pump relief check valve blowing open early.
I would first install a new/different IPR as that is the most likely cause. Perhaps a good dissasembly and cleaning of the valve can solve the problems and other times they just plain stick.
I have seen the internal pump relieve valve bing and issue only once - in fact it was even on a fairly famous 15* pump that laid down some rockstar level horsepower numbers a few years ago - that pump was sold to another guy and the exact same symptoms you describe started to happen - it drove many people nutz trying to figure that one out - in the end the spring was shimmed tighter and all was well.
Jason
I would first install a new/different IPR as that is the most likely cause. Perhaps a good dissasembly and cleaning of the valve can solve the problems and other times they just plain stick.
I have seen the internal pump relieve valve bing and issue only once - in fact it was even on a fairly famous 15* pump that laid down some rockstar level horsepower numbers a few years ago - that pump was sold to another guy and the exact same symptoms you describe started to happen - it drove many people nutz trying to figure that one out - in the end the spring was shimmed tighter and all was well.
Jason
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
I can't get my head around why it will hold 2800psi in stock and not 'chipped'... I've always thought my trucks ran GREAT - but I promise there is a DAY and NIGHT difference between my old tunes and my new ones (quieter - ALOT, more power, better MPG's, faster spool-up, less smoke, etc). One notable difference is my ICP never goes over 2800psi now - before I'd see 3200-3400psi in any tune. More ICP is obviously not needed for more power in my case. I know you've visited with Jody about your problem, but I fergot what you said he said. I can't help but remember Bob Riley's kneejerk reaction to your issue...
Feeling your pain bro. I hope WE get this figured out soon!
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Cargo Master
Joined: Jun 2010
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From: Louisiana
Yea I've got a truck to try parts off of but I've already tried the PCM. Me and Joe talked about just getting my injectors back and taking out my dp and run it like that. And I'll try my dp on the other truck and see what the numbers are on it. Man I didn't want to have to spend the money on my same old injectors. I was even going to go with hybrids and a larger turbo but not if I don't even know what the problem is.
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Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
Stock tune is super weak! Ask frank. When he went for a ride in my truck he thought 80econo was stock and when I switched it to stock he thought I threw an anchor out. He honestly told me if it was his truck he'd of sold it! At least he got to drive it and knows I'm not the only one who thinks it's weak. When I bought the truck it was weak and I even put a ford ipr on it and no difference. Jody said ad codes are oil hungry and two pissibilitys for the low icp and high dc, weak pump or faulty injectors!
Post Fiend
Joined: Nov 2007
Posts: 9,549
Likes: 14
From: Payson, AZ
David,
Have you watched while truck is idling with VCs off? Good way to see if one of the oil rail plugs is leaking or if there is oil leaking past the top oil seal on the injector. The oil rail plugs are the small allen head plugs on the inboard side of the heads.
Have you watched while truck is idling with VCs off? Good way to see if one of the oil rail plugs is leaking or if there is oil leaking past the top oil seal on the injector. The oil rail plugs are the small allen head plugs on the inboard side of the heads.
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Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
I just got off the phone with casserly and he's thinking that there might be a problem between the lpop and the hpop so I'm gonna get another gauge to monitor lpop in the res. I just need to figure out how much pressure should be in there and where to tie into it at. At least I have a direction to go. And by the way Ryan said he'd work with me on injector upgrades but for now put the stock ones back in till the issue is resolved. He didn't want to throw another variable in there with changing injectors. In the meantime I'm gonna put my dp on our company truck to boost my spirit and give
Me something to look forward to!!
Me something to look forward to!!
New User
Joined: Mar 2011
Posts: 3
Likes: 0
From: Mingo, OH
I just got off the phone with casserly and he's thinking that there might be a problem between the lpop and the hpop so I'm gonna get another gauge to monitor lpop in the res. I just need to figure out how much pressure should be in there and where to tie into it at. At least I have a direction to go. And by the way Ryan said he'd work with me on injector upgrades but for now put the stock ones back in till the issue is resolved. He didn't want to throw another variable in there with changing injectors. In the meantime I'm gonna put my dp on our company truck to boost my spirit and give
Me something to look forward to!!
Me something to look forward to!!
Hotshot
Joined: Jul 2008
Posts: 12,782
Likes: 2,142
From: N.GA Mountains
Stock tune is super weak! Ask frank. When he went for a ride in my truck he thought 80econo was stock and when I switched it to stock he thought I threw an anchor out. He honestly told me if it was his truck he'd of sold it! At least he got to drive it and knows I'm not the only one who thinks it's weak. When I bought the truck it was weak and I even put a ford ipr on it and no difference. Jody said ad codes are oil hungry and two pissibilitys for the low icp and high dc, weak pump or faulty injectors!
It simply does not make sense to me that it can 'hold' 2800psi with normal DC, but magically cannot even attain that PSI with tunes. I don't think we are looking for an oil leak. Obviously SOMETHING is up for truck to be weak in stock tune - regardless of ICP/DC, etc.
Refresh my memory. What is your max boost and EGT in stock vs 80e? Can you get black smoke in any tune?
Meanwhile, lets list what we (think we) can rule out:
- IPR is good
- HPOP is good
- injectors are good
- PCM is good
EBPV is not partially stuck, right? No other exhaust restrictions? What is BP?
How about fuel pressure? Any idea what its doing?
I can tell you this engine will run FINE with 5psi of fuel pressure - but run out of power FAST with anything below about 20psi when accelerating. This simultaneously results in low/limited boost.
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Cargo Master
Joined: Jun 2010
Posts: 2,771
Likes: 3
From: Louisiana
Alright I'll start with fuel to rule it out. I have a gauge mounted on my coweling and it never drops below55 and normally runs at 60-62. It is tied in before the fuel filter,but I know it's got pressure. Boost in stock runs a consistent 20 lbs and with tunes it can get to 30 but I think it hangs around 28 for the most part. Egt's in stock can get around 1100 wot but mostly stay around 800-900 when crusing. With tunes it can get to 1300-1400 before I know it. Ebpv is deleted! It will smoke in 80 and 120 tunes but seems to clear up once rolling good. Also is straight exaust 4" to 5" under cab. I'm going insane Jason, Jacquie said never again will I get a used truck.