Replaced ficm...truck wont start!

poprocks315 · 11-21-2012, 08:05 AM

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!!

**jc1843** · 11-21-2012, 09:06 AM

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.

rebpdt · 11-21-2012, 09:15 AM

did you reprime the fuel system?

poprocks315 · 11-21-2012, 11:14 AM

I have a 02 LB7...I did prime and cracked the bleeder the fuel was foamy almost looked like soda fizz

rebpdt · 11-21-2012, 12:48 PM

is the bulb staying firm after you go to start it?

poprocks315 · 11-21-2012, 01:07 PM

What bulb are you talking about?

**jc1843** · 11-21-2012, 02:38 PM

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.

poprocks315 · 11-21-2012, 03:06 PM

^^^^ 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

**jc1843** · 11-21-2012, 04:29 PM

Moving to LB7-- truck runs

11-21-2012, 08:05 AM	eBay Motors #1 (permalink)
poprocks315 Join Date: Nov 2012 Location: 93035 CA Posts: 4	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!!

11-21-2012, 09:06 AM	eBay Motors #2 (permalink)
jc1843 Super Moderator Join Date: Jun 2008 Location: So. Cal Posts: 9,179	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. __________________ Chevy 04.5 LLY, 2X, shell, XDR, MikeL 6spd, TransGo, deep pan, blocked, fingered, de-badged, PCV, 65 Gallon replacement Aero tank, PPE on 2, LBZ-mp, 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.

11-21-2012, 09:15 AM	eBay Motors #3 (permalink)
rebpdt DuramaxForum Enthusiast Join Date: Nov 2010 Location: across the street Posts: 3,606	did you reprime the fuel system? __________________ CCSB LB7 4x4

11-21-2012, 12:48 PM	eBay Motors #5 (permalink)
rebpdt DuramaxForum Enthusiast Join Date: Nov 2010 Location: across the street Posts: 3,606	is the bulb staying firm after you go to start it? __________________ CCSB LB7 4x4

11-21-2012, 02:38 PM	eBay Motors #7 (permalink)
jc1843 Super Moderator Join Date: Jun 2008 Location: So. Cal Posts: 9,179	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. __________________ Chevy 04.5 LLY, 2X, shell, XDR, MikeL 6spd, TransGo, deep pan, blocked, fingered, de-badged, PCV, 65 Gallon replacement Aero tank, PPE on 2, LBZ-mp, 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.

11-21-2012, 11:14 AM	eBay Motors #4 (permalink)
poprocks315 Join Date: Nov 2012 Location: 93035 CA Posts: 4	I have a 02 LB7...I did prime and cracked the bleeder the fuel was foamy almost looked like soda fizz

11-21-2012, 01:07 PM	eBay Motors #6 (permalink)
poprocks315 Join Date: Nov 2012 Location: 93035 CA Posts: 4	What bulb are you talking about?

11-21-2012, 03:06 PM	eBay Motors #8 (permalink)
poprocks315 Join Date: Nov 2012 Location: 93035 CA Posts: 4	^^^^ 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

11-21-2012, 04:29 PM	eBay Motors #9 (permalink)
jc1843 Super Moderator Join Date: Jun 2008 Location: So. Cal Posts: 9,179	Moving to LB7-- truck runs __________________ Chevy 04.5 LLY, 2X, shell, XDR, MikeL 6spd, TransGo, deep pan, blocked, fingered, de-badged, PCV, 65 Gallon replacement Aero tank, PPE on 2, LBZ-mp, 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.

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