95 F350 lacking power - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 20 (permalink) Old 10-13-2012, 11:45 PM Thread Starter
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95 F350 lacking power

Hi, new to the forum but have been following for a while. my 95 F350 starts and runs great and i had no problem with it until i drove my buddies 96 F250. his truck makes way more power in the 50hp setting than mines does in the 120hp. also as you change the chip stage by stage i cant tell a difference between the stages until 100hp + settings.
MY TRUCK - new 6637 intake, 3" mbrp down pipe to 4" to 7" stacks, TS 6 position chip, manual trans, new fuel filter and it has 355k on it.
MY BUDDIES TRUCK - 96 F250, 6637 intake, 3" mbrp down pipe to 5" conventional exhaust, TS 6 position chip, manual trans, and 370k. any ideas, weak injectors?? thanks in advance for the help!!
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post #2 of 20 (permalink) Old 10-13-2012, 11:54 PM
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Re: 95 F350 lacking power

It could be so many different things, a weak fuel pump, weak hpop, could be a difference in truck weight.....

Get a good scanner like ae and scan both trucks

02 f250
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post #3 of 20 (permalink) Old 10-13-2012, 11:58 PM Thread Starter
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Re: 95 F350 lacking power

have you heard of many hpop's getting weak, when i was having problems with my last f250 the local diesel injection shop told me the either work or they dont but he was kind of grumpy.
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post #4 of 20 (permalink) Old 10-14-2012, 12:13 AM Thread Starter
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Re: 95 F350 lacking power

just checked my fuel pressure. gauge said 48 psi at idle??? thought they ran half that on the low side?
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post #5 of 20 (permalink) Old 10-14-2012, 02:06 AM
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Re: 95 F350 lacking power

No 48 psi is actually ok. As far as the hpop goes, they can be weak and still function but you will run out of hpo at wot.

97 F-350 XLT CC DRW 4X4 PSD, 285/75-16 Custom bumpers, Gauges-boost/egt/trans, Swamps IDM, 3.5"dp- 4" exh., 3" Body lift, ES bushings/mounts, Built trans, billet conv, B&M pan, Hayden cooler, Adrenaline, stage 2's, IC, H2E, E-fuel
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post #6 of 20 (permalink) Old 10-14-2012, 02:21 AM
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Re: 95 F350 lacking power

48 is ok at idle but my obs would idle between 60-65psi and psi would only drop to 50 under wot. So at 48psi at idle your fuel psi at wot is prolly around 20-30.

02 f250
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post #7 of 20 (permalink) Old 10-14-2012, 03:25 AM
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Re: 95 F350 lacking power

Im new to this PS game but ive read a lot on Super Duty electric fuel pump mod on our OBS. Try searching that if your fuel delivery/pump is getting tired.

1996 F-250 PSD 4x4 5 sp. 4" TBE, bhaf, beans diesel 6 position chip. Needs injectors and an innercooler so bad. Low end TQ SUCKS! Even with 4:10s
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post #8 of 20 (permalink) Old 10-14-2012, 04:03 AM Thread Starter
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Re: 95 F350 lacking power

ive read a few write ups on the electric pump swap, on the to do list. whats strange is my turbo spools faster than my buddies. at wot it spools and smokes but the speedo is lazy to climb, his truck will lay you back in the seat pretty hard.
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post #9 of 20 (permalink) Old 10-14-2012, 04:33 AM
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Re: 95 F350 lacking power

Sounds to me the truck is defueling. A cause of defuling can be cause by several sensors. Starting with the exhaust back pressure sensor With cold temps, the PCM increases the idle speed, and tells the EBPV to close to put a little load on the engine and increase the exhaust temp. The sensor is there to tell the PCM when the exhaust pressure it asked for has been reached (this is called feedback control), so the PCM can ease the valve open and maintain that pressure. Once the engine oil temp reaches a certain value, indicating that the engine is fully warmed up, the PCM opens the EBPV. If the evp sensor is clogged with soot it will read high and cause the engine to defuel at all temps. The map sensor,baro sensor,and the ebvp sensor should all be reading at 14 psi with koeo on the scanner. If you have an advance scanner you can read these sensors together in a custom setting. Unplug the map sensor and drive it and see if you see an increase in hp. Also do the same with the ebvp sensor. Try both at the same time the computer will go on default mode and use other sensor to compensate. No harm will be done for testing. Hope this helps....
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post #10 of 20 (permalink) Old 10-14-2012, 05:15 AM Thread Starter
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Re: 95 F350 lacking power

just got back from a test drive. unplugged the map and ebvs one at a time then both. made no difference, fuel pressure is 25ish at wot and 38ish at 1300 cruising, boost was the same, 24 psi at 2800 rpm. still can not tell a difference when i hold the accel pedal in the same spot and switch between chip settings until i get to the 120hp setting then it jumps up in power a little bit.
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