tecanic1 Posted March 5, 2008 Share Posted March 5, 2008 2004 f550 4x2 with a plow. crank no start after cold soak. no ficm sync, pcm sync, pulse width and cmp fault reading yes. tried new crank sensor,new cam sensor, new ficm, load tested all wiring to and from sensors. good battery power and vref. good icp and fuel psi. good ficm m power never goes below 48 volts appears to have good rpm signal but does bounce between 113rpm to 170rpms while cranking. seems very unstable. heres my question.. fse states poss magnetized crank causing interference with crank signal. in the process of checking this tomorrow in a m with oscilloscope to verify signal. but has anyone heard of this?????????? thanks for any advice......... Quote Link to comment Share on other sites More sharing options...
Shlep Posted March 6, 2008 Share Posted March 6, 2008 Judging by the fact your rpm pid is bouncing makes me wonder if you have a tooth wheel on the crank thats come loose. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted March 6, 2008 Share Posted March 6, 2008 Quote: fse states poss magnetized crank causing interference with crank signal And combined with the reverse polarity of the flux capacitors and the inverted inverse compression injectors the engine couldn't possibly start! Magnetized crankshaft? What the fuck kind of Star Trek bullshit is that? Whats next? Negative amperage induced at the glow plugs from the magnetic crank rotation?You DID slap your FSE didn't you? /forums/images/%%GRAEMLIN_URL%%/boink3.gif Quote Link to comment Share on other sites More sharing options...
Shlep Posted March 6, 2008 Share Posted March 6, 2008 And combined with the reverse polarity of the flux capacitors and the inverted inverse compression injectors the engine couldn't possibly start! Magnetized crankshaft? What the fuck kind of Star Trek bullshit is that? Whats next? Negative amperage induced at the glow plugs from the magnetic crank rotation? You DID slap your FSE didn't you? /forums/images/%%GRAEMLIN_URL%%/boink3.gif /forums/images/%%GRAEMLIN_URL%%/rofl.gif Thats the best reply I've ever seen /forums/images/%%GRAEMLIN_URL%%/cheers.gif Quote Link to comment Share on other sites More sharing options...
slim Posted March 6, 2008 Share Posted March 6, 2008 Oh yeah, I have a whole pile of magnetized cranks laying in the corner. Just kidding. That is the stupidest thing I have heard today. I can't believe these are the experts we are supposed to call when we have trouble. I would start by scoping the crank signal and see what it looks like and if looks bad try to check the crank wheel by eye. I use a boroscope to look into the hole while cranking the engine over. Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted March 6, 2008 Share Posted March 6, 2008 Good suggestion to scope the signal from the sensor. I think the IDS help files have some examples that will help you and I believe Bruce has posted some screen shots as well... look in out Photo Post area. Better yet: Read this post ----> Long crank time '03 6.0 Bruce and GregH posted some good scope screen shots of CKP and CMP waveforms. Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted March 6, 2008 Share Posted March 6, 2008 6.0 Idling: 6.0 Cranking: Both 6.0 waveforms were taken at pins 30 and 31 with the ground leads at the battery negative. The pins are labeled + on the schematic, but the CKP wave goes downward on its initial sweep. Pay attention to which pin you use and which direction the wave goes on its initial sweep, if the sensor is wired backwards it will act up. 6.4 is the same, the last time I posted I couldn't find my 6.0 waveforms. I probably could have changed my voltage scale to make the CMP appear a bit larger: As for the "magnetized crank", I have "heard" of it but never experienced it myself. Keith: Is there a way to "turn up" the resolution on a picture? You can't read the voltage and time stamps, which are very important. Good Luck! /forums/images/%%GRAEMLIN_URL%%/grin.gif Quote Link to comment Share on other sites More sharing options...
Bruce Amacker Posted March 6, 2008 Share Posted March 6, 2008 Good suggestion to scope the signal from the sensor. I prefer to take it at the PCM in case there's a harness issue. Hopefully you have a 104 BOB and a 122 adapter. Good Luck! /forums/images/%%GRAEMLIN_URL%%/grin.gif Quote Link to comment Share on other sites More sharing options...
Keith Browning Posted March 6, 2008 Share Posted March 6, 2008 Actually, I was referring to the signal itself. Accessing the sensors and connecting probes directly to them would be insane... but excellent advice as usual Mr. Amacker! /forums/images/%%GRAEMLIN_URL%%/thumbup.gif Quote Link to comment Share on other sites More sharing options...
tecanic1 Posted March 7, 2008 Author Share Posted March 7, 2008 well has suspected does not have a magnetized crank.... did scope both sensors and found cmp to intermittent. found that possible air gap issue at the cmp sensor. it appears to a rotting block issue. surface where the sensor mounts is very uneven. did sand as flat as possible today. will try in a.m thanks for the advice. definitely like the back to the future and star trek reply good one...... Quote Link to comment Share on other sites More sharing options...
Mekanik Posted March 7, 2008 Share Posted March 7, 2008 Quote: fse states poss magnetized crank causing interference with crank signal And combined with the reverse polarity of the flux capacitors and the inverted inverse compression injectors the engine couldn't possibly start! Magnetized crankshaft? What the fuck kind of Star Trek bullshit is that? Whats next? Negative amperage induced at the glow plugs from the magnetic crank rotation? You DID slap your FSE didn't you? /forums/images/%%GRAEMLIN_URL%%/boink3.gif LMAO /forums/images/%%GRAEMLIN_URL%%/rofl.gif. Did you try de-magnetizing the crankshaft? /forums/images/%%GRAEMLIN_URL%%/icon_crazy.gif Or maybe the crankshaft has too much static electricity. Quote Link to comment Share on other sites More sharing options...
DwayneGorniak Posted March 7, 2008 Share Posted March 7, 2008 Gee, next thing you know, they will have us demagnetizing the whole vehicle like they mention in the compass section of the service manual. David, you should have asked the FSE if the compass itself could have caused the signals to get confused on what direction they are supposed to go. /forums/images/%%GRAEMLIN_URL%%/icon_crazy.gif Quote Link to comment Share on other sites More sharing options...
Tony302600 Posted March 7, 2008 Share Posted March 7, 2008 Gee, next thing you know, they will have us demagnetizing the whole vehicle like they mention in the compass section of the service manual. David, you should have asked the FSE if the compass itself could have caused the signals to get confused on what direction they are supposed to go. /forums/images/%%GRAEMLIN_URL%%/icon_crazy.gif /forums/images/%%GRAEMLIN_URL%%/rofl.gif /forums/images/%%GRAEMLIN_URL%%/rofl.gif /forums/images/%%GRAEMLIN_URL%%/rofl.gif Quote Link to comment Share on other sites More sharing options...
snw blue by you Posted March 7, 2008 Share Posted March 7, 2008 Quote: fse states poss magnetized crank causing interference with crank signal And combined with the reverse polarity of the flux capacitors and the inverted inverse compression injectors the engine couldn't possibly start! Magnetized crankshaft? What the fuck kind of Star Trek bullshit is that? Whats next? Negative amperage induced at the glow plugs from the magnetic crank rotation? You DID slap your FSE didn't you? /forums/images/%%GRAEMLIN_URL%%/boink3.gif You suck Keith! I just blew orange juice outta my nose! Good thing my keyboard has a cover on it. BTW, man the life boats and put your chest waders on, the BS is really deep. Quote Link to comment Share on other sites More sharing options...
BrunoWilimek Posted March 7, 2008 Share Posted March 7, 2008 You guys just made my day. Keep the laughs coming. It's hilarious what some of these FSE's come up with. /forums/images/%%GRAEMLIN_URL%%/rofl.gif Quote Link to comment Share on other sites More sharing options...
LARRY BRUDZYNSKI Posted March 8, 2008 Share Posted March 8, 2008 Before long you will have to be wearing white coveralls,booties and surgical gloves, not to mention be grounded to something just to be able to touch them. I think you just had a wool sweater on before you pulled the truck in and charged it. Was your hair standing up with static electricity? As for Keiths reply, and I quote...(Scottie) Captain I'm giving it everything she's got.... Quote Link to comment Share on other sites More sharing options...
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