Replaced ficm...truck wont start! - Chevy and GMC Duramax Diesel Forum
01-04.5 LB7 Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission Ect

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Old 11-21-2012, 08:05 AM   eBay Motors  #1 (permalink)
 
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Replaced ficm...truck wont start!

Hey there I replaced my FICM yesterday and when I went to start my truck she ran for about 10 seconds then, she died and still wont start. I put my old FICM back in and still wont start I am highly confused. Any sugestions would be amazing thanks!!

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Old 11-21-2012, 09:06 AM   eBay Motors  #2 (permalink)
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What year do you have-??
If a LLY-- be sure to check this--!----
At the side of the alternator, the FICM harness tied down with a Zip tie. Cut the tie and pull the wires from the harness and inspect for cuts and wear. The sharp corner of the FICM bracket where it is tied down to, cuts into the wires. Repair and insulate the harness with a short piece of heater hose.
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Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
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Old 11-21-2012, 09:15 AM   eBay Motors  #3 (permalink)
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did you reprime the fuel system?
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Old 11-21-2012, 11:14 AM   eBay Motors  #4 (permalink)
 
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I have a 02 LB7...I did prime and cracked the bleeder the fuel was foamy almost looked like soda fizz
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Old 11-21-2012, 12:48 PM   eBay Motors  #5 (permalink)
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is the bulb staying firm after you go to start it?
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Old 11-21-2012, 01:07 PM   eBay Motors  #6 (permalink)
 
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What bulb are you talking about?
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Old 11-21-2012, 02:38 PM   eBay Motors  #7 (permalink)
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The fuel runs through the FICM to cool it. On the fuel filter housing, there is a small can like button-- that is the fuel primer pump. Next to the primer, there is a plastic screw. Open the screw and pump the primer pump until fuel comes out. Close the screw [careful;-plastic] and pump the primer until it gets firm. Crank the engine a couple times, and pump the primer again until firm. it should start not.
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Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
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Old 11-21-2012, 03:06 PM   eBay Motors  #8 (permalink)
 
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^^^^ Thanks I did this before but decided to do it again and the truck fired up it took awhile but she is good to go...thanks guys much appreciated

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Old 11-21-2012, 04:29 PM   eBay Motors  #9 (permalink)
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Moving to LB7-- truck runs
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Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry
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