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Old 09-06-2019, 05:32 PM
trevdalocal trevdalocal is offline
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Default Romping idle, "missing" under acceleration, low boost, poor mileage

Howdy, truck has recently developed a slight romp at idle, doesn't seem to matter if oil is hot or cold, but occasionally it idles smoothly, usually when cold. Engine starts up quickly, about a half second of cranking and it lights, romps moderately for a few seconds, then cleans up to the slight romp.

Truck also feels like it's running on less than 8 cylinder under moderate acceleration, especially noticeable when you lug the engine down a bit. You can feel the "chugging" and hear it in the exhaust. Truck struggles to make 12PSI (according to ForScan) at WOT in 4th gear (ZF5 truck) at 2500-3000 RPM, and that's with the tow tune engaged on my DP F5 (I know, saving up for a PHP). Pretty gutless on stock. Downpipes don't look like they're leaking, firewall looks pretty clean.

Truck has 162k mi, and I believe the injectors are original. The injectors sounds pretty loud and crackly on tow tune, it quiets down a bit on "stock". I don't recall them being that loud before, but I could be imagining things. Fuel filter is less than 2k mi, same for the oil, 15W-40 Motorcraft with a Motorcraft filter. T500 HPOP easily holds 3000 WOT, 500-600 at idle. I am going to clean out the FPR screens this weekend.

All 8 buzz fine on a buzz test, and it passes a contribution test. Any ideas? I believe the Baro sensor is no good, as it shows 9.0PSI on ForScan, but from what I read, it shouldn't be causing these symptoms.
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'96 CCLB, aFe intake, billet wheel, 3" downpipe, 4" Magnaflow, T500 HPOP, DP Tuner
  #2  
Old 09-07-2019, 12:44 PM
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ghohouston ghohouston is offline
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Oil in the i.c.p. sensor connector?
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1997 F350 SRW CCLB 4x4 ZF5 7.3
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  #3  
Old 09-07-2019, 01:43 PM
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Magnum PD Magnum PD is offline
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How old is the CAM sensor?
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96 F-350 RC 4x4 Hypermax Rods, PIS 300/200s G head tunes, Garrett GT4294, Beans IDM, ARP head & main, girdle, half filled block, DI cam, Dual IPRs, ceramic coated bowls, anti-friction skirts, Haldex pump over Honey Badger Jr, Diesel site High volume lpop, Billet intake Plenums, Dual SD pumps, Fluidampner, beehive springs, cosmetic head gaskets, Inconel valves, hardend guides, Ported and polished heads by me, home made RR fuel, 5 speed tranny, with SB 3600 DxD. Snow water meth.
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Old 09-08-2019, 11:59 PM
trevdalocal trevdalocal is offline
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Quote:
Originally Posted by ghohouston View Post
Oil in the i.c.p. sensor connector?
Dry as a whistle!

Quote:
Originally Posted by Magnum PD View Post
How old is the CAM sensor?
Age is unknown. I have a new Ford one, you think it would be worth it to swap it out?

I broke the plastic check valve trying to clean the FPR screen, and my T500 is weeping from the back plate again, so I've decided to bite the bullet and go efuel. Looking at the Strictly Diesel kit, seems to be well regarded here.
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'96 CCLB, aFe intake, billet wheel, 3" downpipe, 4" Magnaflow, T500 HPOP, DP Tuner
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Old 09-10-2019, 05:09 PM
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I would try the ford cps
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96 F-350 RC 4x4 Hypermax Rods, PIS 300/200s G head tunes, Garrett GT4294, Beans IDM, ARP head & main, girdle, half filled block, DI cam, Dual IPRs, ceramic coated bowls, anti-friction skirts, Haldex pump over Honey Badger Jr, Diesel site High volume lpop, Billet intake Plenums, Dual SD pumps, Fluidampner, beehive springs, cosmetic head gaskets, Inconel valves, hardend guides, Ported and polished heads by me, home made RR fuel, 5 speed tranny, with SB 3600 DxD. Snow water meth.
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Old 09-10-2019, 07:30 PM
trevdalocal trevdalocal is offline
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Quote:
Originally Posted by Magnum PD View Post
I would try the ford cps
Gotcha. I'll slap it in while I'm doing the efuel and HPOP rear plate reseal (again) and post up the results!
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'96 CCLB, aFe intake, billet wheel, 3" downpipe, 4" Magnaflow, T500 HPOP, DP Tuner
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