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Old 01-05-2018, 09:44 AM
Partsman Partsman is offline
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Default 96 random miss with fuel knock

Hello all
I'm new here, was a member of another site that got way too commercial a few year back.
I saw Dave(golfer) here and joined.

Working on a friends 96 that has a weird random miss, most pronounced form 2k to 2200 but I feel it at all rpm's.

What I have done so far: CPS and connector(that got it to run)
Tighten loose IPR nut and Replaced fuel soaked connector.
Swapped IDM and ICP with mine.
Unplugged outer VC connectors 1 at a time and miss is still there.
Changed fuel pump that was starting to leak and all new hoses.
Cleaned fuel filter housing that had 1/2 inch of rust in bottom, FPR screen and new filter.

No codes show up with Superchips programmer and program set to stock.
I have a HP oil gauge tee'ed in right side and it looks like the pressure jumps UP when it misses.
It does it in park or driving. I don't have a way to watch real time data at the moment.
  #2  
Old 01-08-2018, 03:47 PM
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superpsd superpsd is offline
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Do you have anyway of running a buzz test and CCT
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  #3  
Old 01-09-2018, 10:17 AM
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not at the moment, but I'm working on it.
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Old 02-05-2018, 08:31 AM
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I got to get back on this thing. Still have not run any live data but I was thinking yesterday. Has anyone heard of a 7.3 breaking a valve spring? I'm thinking what I thought was a fuel knock is a valve slamming home. That would explain when I unhook the harnesses it still misses.
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Old 02-05-2018, 08:59 AM
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Or bent push rod.
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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.
  #6  
Old 02-12-2018, 01:55 PM
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CPS CPS CPS CPS
Damn BWD cps was doing the same thing as the old one.
Ford CPS fixed it.
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Old 02-12-2018, 07:46 PM
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Its crazy how a bad or failing CPS can sound.
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Old 02-13-2018, 07:45 AM
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Yeah, in the back of my mind I kept thinking the only times I have seen one run goofy it's been the CPS
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