Running rough, at times. - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 6 (permalink) Old 07-25-2017, 04:27 AM Thread Starter
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Running rough, at times.

97 7.3l Powerstroke. Had a fuel leak in the valley. Drove for a while until i was able to fix it. Rebuilt fuel bowl and replaced a leaky fuel pump. Couple of weeks before replacing fuel pump and rebuilding the bowl, it would start missing at times while driving. It progressively got worse. Figured I wasn't getting the fuel pressure I needed, so I decided it was time to work on it. Did the work and the rough running/missing at times issue persists. When it's running rough, my speedo jumps around maybe 3 mph up and down from a central point. I've been having hard shifts since I bought the truck, so before doing the fuel system work, I pulled the psom and reflowed the solder joints. Did a buzz test tonight and they all sound fine. No cel or codes stored at all. What should I look at next?

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1997 F350 7.3 PSD CCLB 4x4 Auto 310,000 miles Bone stock
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post #2 of 6 (permalink) Old 07-25-2017, 04:57 AM Thread Starter
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Re: Running rough, at times.

I've solved the riddle. An admin can make this a sticky if you see fit. My fuel leak was hiding an oil leak. After checking my oil, and adding 1 gallon to the engine, it is still 4 quarts low. The HPOP was starved for oil and causing my rough running issues. Runs like new now. I believe it's my rms that's leaking. You guys can laugh if you like, but it never occurred to me that my fuel leak was hiding something even more serious. It could have cost me an engine.

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post #3 of 6 (permalink) Old 07-25-2017, 12:37 PM
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Re: Running rough, at times.

What's the RMS?

Old Blue, 97' F350, CCLB, 7.3, Auto
Air: SD IC, 3" Plenums
Fuel: E- Fuel, 160/30 Injectors
Turbo: Irate T4, S366
Oil: T500, Melling LPOP
PCM: TW TS, IDM Mod
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post #4 of 6 (permalink) Old 07-25-2017, 04:18 PM
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Re: Running rough, at times.

Rear Main Seal.

1997 CCSB, 7.3/E4OD
KC TP38R, CNC Fab Bellowed Up-Pipes, Full Force Stg 1 injectors, 3" DP, 4" exhaust, CNC Fab HPOP, Mark F E-Fuel, 7.3 Intercooler, 1.0 Exhaust Housing, TS Chip, remote coolant filter, and VB.
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post #5 of 6 (permalink) Old 07-25-2017, 05:33 PM
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Re: Running rough, at times.

As far as oil leaks go, the turbo pedestal o rings will appear as a rear main seal leak ata glance because the engine valley has a drain hole that goes into the bell housing. Just about anything that leaks into the valley can appear like the rear seal. The really strange thing is your oil levels. On a 97, with 1 gallon added and STILL 4 qts low, the injectors shouldn't even fire at all. My 96 dies at a little less than 3 qts down, quits and acts JUST like it's out of fuel. Top off the oil, crank it, and work out the air, it runs great. You might check the pedestal o rings and also the HPO end rail plugs for leakage. Both can really dump a lot of oil in a short period of time if they are bad.........
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post #6 of 6 (permalink) Old 07-29-2017, 03:34 AM Thread Starter
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Re: Running rough, at times.

Quote:
Originally Posted by dragondave View Post
As far as oil leaks go, the turbo pedestal o rings will appear as a rear main seal leak ata glance because the engine valley has a drain hole that goes into the bell housing. Just about anything that leaks into the valley can appear like the rear seal. The really strange thing is your oil levels. On a 97, with 1 gallon added and STILL 4 qts low, the injectors shouldn't even fire at all. My 96 dies at a little less than 3 qts down, quits and acts JUST like it's out of fuel. Top off the oil, crank it, and work out the air, it runs great. You might check the pedestal o rings and also the HPO end rail plugs for leakage. Both can really dump a lot of oil in a short period of time if they are bad.........
Thanks! I know the ebpv shaft has some oil buildup on it, but it looks like a slow leak.

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1997 F350 7.3 PSD CCLB 4x4 Auto 310,000 miles Bone stock
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