'05 Ex Starting Issue
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Trailering
Joined: Feb 2013
Posts: 19
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'05 Ex Starting Issue
About a month or so ago I went out to the Ex and went to start it. Cranked and cranked but no start. Left it and went to work and tried again the next day. No start. Temps were low 40's in the morning. About a week after that, the weather warmed a bit, and the Ex started right up. Huh... So I got a code scanner and sure enough, low voltage to all 8 cylinders. Damn I thought, the FICM is going bad. So I researched on here and the powerstroke forum about fixing or diagnosing for sure the problem and how to fix it. Well, since then the truck starts just fine. Cranks a little long but does start. So yesterday, I got a Edge Insight at my local mechanic and installed it. Here's what I got:
On run but no start: FICM voltage is 47.5-48
Battery volts vary as low as 10.6 to 11.2
During start: FICM stays at 47.5-48
Battery volts stay 10.4 - 10.6
Driving: FICM stays as above
Battery volts 12.3 to 12.9
I'm thinking my FICM is OK but I need new batteries? It's warmer now so the truck is starting fine. RIght track?
Other thing, a while back I posted about rear drive line vibration in my Ex. Got a new rear drive line built, transfer case serviced, rear diff fluids changed (found I had 4.56 gears). Also found the truck I bought at a stealer "used" to be lifted but was returned to semi stock height. Turns out the drive line angle to the rear diff was off. Got shimmed, new U-Bolts and no drive line noise. Got lucky on that one I guess.
On run but no start: FICM voltage is 47.5-48
Battery volts vary as low as 10.6 to 11.2
During start: FICM stays at 47.5-48
Battery volts stay 10.4 - 10.6
Driving: FICM stays as above
Battery volts 12.3 to 12.9
I'm thinking my FICM is OK but I need new batteries? It's warmer now so the truck is starting fine. RIght track?
Other thing, a while back I posted about rear drive line vibration in my Ex. Got a new rear drive line built, transfer case serviced, rear diff fluids changed (found I had 4.56 gears). Also found the truck I bought at a stealer "used" to be lifted but was returned to semi stock height. Turns out the drive line angle to the rear diff was off. Got shimmed, new U-Bolts and no drive line noise. Got lucky on that one I guess.
Senior User
Joined: Aug 2006
Posts: 307
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From: Siesta Key, FL
I guess first thing I'd do is get this over on the Powerstroke forum. Some of the guys from here are over there also, plus 10x more 6.0 gurus!
Just at a glance, your FICM numbers look fine. The fact you're not going below 47.5 during start is a good sign. I'd really look at the battery to start with. But at the same time I'd expect a slow-crank. Either way, these trucks are not nice to batteries. The whole inductive-heating b.s., as well as they run for the first 90 seconds off the battery kills them over time. When you say it won't start, does it sound like a healthy crank, or does it try to catch at all? What was the P-code it threw on the low voltage?
Just at a glance, your FICM numbers look fine. The fact you're not going below 47.5 during start is a good sign. I'd really look at the battery to start with. But at the same time I'd expect a slow-crank. Either way, these trucks are not nice to batteries. The whole inductive-heating b.s., as well as they run for the first 90 seconds off the battery kills them over time. When you say it won't start, does it sound like a healthy crank, or does it try to catch at all? What was the P-code it threw on the low voltage?
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Dilligas
1967 - 1972 F-100 & Larger F-Series Trucks
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Feb 4, 2008 07:41 AM
