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Old 02-20-2012, 06:36 PM
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Rough start, bad mpg

Earlier this fall i had new glow plugs/block heater installed. Now that its winter if cranks for almost 30 seconds before it starts, and that's with it plugged in. It cranks for a minute or two, sometimes longer, when not plugged in. I've also never got very good mpg with it either. When i bought it, it had an 8 in lift with 38's on it...but i didn't like it so i sold the lift and tires for a leveling kit and 32 in tires, and still didn't get any better mileage. I also deleted the muffler, cat, and did a complete egr delete and can't seem to get over 12 mpg... is this all related?
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Old 02-20-2012, 07:30 PM
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Does it idle rough on start-up? Any smoke?
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Old 02-20-2012, 08:44 PM
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Yes at first start up it idles rough and i get some white smoke... but as soon as it starts up everything smooths out and the exhaust clears up
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Old 02-21-2012, 06:26 AM
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What's your FICM voltage? Under 46V at any time and it needs to be replaced.
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Old 02-21-2012, 06:45 AM
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Originally Posted by Fishermedic View Post
What's your FICM voltage? Under 46V at any time and it needs to be replaced.
I bet your FICM is toast
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Old 02-21-2012, 06:48 AM
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+3 on the FICM
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Old 02-21-2012, 10:12 AM
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When it runs it usually stays around 47.5 and during start up never drops below 46... atleast thats what my edge evolution insight shows
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Old 02-21-2012, 10:44 AM
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Mine never drops below 48V.
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Old 02-21-2012, 12:21 PM
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Originally Posted by ZachMyers View Post
When it runs it usually stays around 47.5 and during start up never drops below 46... atleast thats what my edge evolution insight shows
Mine did the same thing, until one cold day, it was at 36v. I had blueish smoke during warmup, and some rough idles at times. You need to check it at the FICM, during cranking. I have the Edge Insight, and it just doesn't read fast enough to catch it during the short starting procedure
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Old 02-21-2012, 11:43 PM
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Ok I plan on doing a load test on my batteries tomorrow, and then doing a voltage test on the ficm...if it does need repaired is it worth it to do 58v upgraded ficm... ficmrepair.com says its a bad idea because a normal ficm gets hot enough just being under the hood...and adding extra volts means for extra stress
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