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| 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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12-07-2012, 08:33 PM
| eBay Motors #1 (permalink) |
| Junior Member Join Date: Oct 2012
Posts: 62
| Lb7 engine cranks but will not start Finally got my "flood damaged" truck ready to see if the engine will run. The engine will crank but will not start. I have a GM service manual that shows the steps for a CRANK-NO START symptom but I am going to have to find a good scan tool to use for some of them and learn the locations of some of the sensors that it mentions. No codes are showing on my BASIC scan tool! If anyone has any basic suggestions, I greatly appreciated them! Here's what Ive gathered so far: “Try priming your filter. You'll have to loosen a black plastic screw sitting on top of the filter housing then press down on the big plunger next to that black screw, keep 'plunging' it until fuel runs out from where the black plastic screw is, then tighten that screw back up. By the way, don't remove that black screw, just loosen it.” Dont know if this will tell me anything other than if the filter is getting fuel? Here's a video: Notice the REDUCED ENGINE POWER light is on.
__________________ 2002 Chevy Duramax-Crew Cab 4x4 SB IT RUNS!! Last edited by Cowansauto; 12-10-2012 at 07:38 PM. |
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12-07-2012, 09:19 PM
| eBay Motors #2 (permalink) |
| DuramaxForum Fanatic  Join Date: Mar 2010 Location: Abingdon Virginia
Posts: 5,795
| all that is really telling you is how to prime your fuel system. Do you think it is electrical ?
__________________ Josh 04 LLY CCSB 4X4 |
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12-07-2012, 10:08 PM
| eBay Motors #3 (permalink) |
| ATPTRUCKS   Join Date: Sep 2009 Location: Boise, ID
Posts: 10,851
| Do a compression check and see if there is compression. Crack a fuel line and see if there is fuel. And make sure no electrical issues considering these trucks are very sensitive. Sent from my iPhone using AutoGuide.com App
__________________ Dustin im 22 and yes i bought my trucks myself Blackout :06 GMC lbz 4x4 Built motor, SDP twins, exergy Injectors, Self built trans White Thing :07 Chevy lbz 4x4 Caged and built to the hilt  Special thanks to: Mike L, Gtrippin, IdahoRob, SDP, ISSPRO, Yukon, and Cam at AP LIKE US ON FACEBOOK! Adrenaline Truck Performance IDAHO ROB 208.685.1000 |
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12-08-2012, 07:02 AM
| eBay Motors #4 (permalink) |
| Junior Member  Join Date: Dec 2011 Location: White House, TN
Posts: 58
| FICM maybe?
__________________ 2002 CCSB stright 4"exhaust, TS performace 100HP box, KYB Shocks, Air dog II 165,Bills custom intake, Nicktane one micron set up. |
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12-10-2012, 07:38 PM
| eBay Motors #5 (permalink) |
| Junior Member Join Date: Oct 2012
Posts: 62
| Ttt
__________________ 2002 Chevy Duramax-Crew Cab 4x4 SB IT RUNS!! |
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12-10-2012, 08:17 PM
| eBay Motors #6 (permalink) |
| DuramaxForum Fanatic Join Date: Mar 2010 Location: Abingdon Virginia
Posts: 5,795
| I know its simple, but you have gone through all the relays, fuses, and ruled that it is actually getting fuel to the cylinders ?
__________________ Josh 04 LLY CCSB 4X4 |
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12-11-2012, 05:19 PM
| eBay Motors #7 (permalink) |
| DuramaxForum Veteran  Join Date: Mar 2011 Location: Huntersville, NC
Posts: 1,235
| Hit the Schrader valve and see if fuel comes out. I know when I had my injectors done last time it took me cranking and my buddy priming the filter to get the truck to fire. Takes a good amount of fuel to fill the filter and rails.
__________________ Justin 2001 LB7 Silverado 2500HD LT CCSB 4x4. EFI Live by Idaho Rob, 298K+ and rolling, Undercover Bed Cover, Vortex spray in bed liner, Westin steps, Bilstein Shocks, Road Master Active Suspension, MBRP 5" Exhaust, Edge Insight CTS, K&N drop in filter, AirDog II 100, Nicktane w/ CAT UHE, Running on LMM Blacked out Wheels & Michelin LTX M/S2 tires. ADRENALINE TRUCK PERFORMANCE APPALACHIAN COAL ROLLERS Merchant Automotive CENTRAL FLORIDA DURAMAX |
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12-11-2012, 07:27 PM
| eBay Motors #8 (permalink) |
| Junior Member Join Date: Apr 2010
Posts: 27
| It could be a thousand things when I had that problem it was the flywheel, some teeth were bad it had to spin to the good teeth to start. |
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12-11-2012, 08:29 PM
| eBay Motors #9 (permalink) |
| Join Date: Nov 2012 Location: Denair Ca
Posts: 9
| Did you check the crank position sensor, and clean the connector |
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12-14-2012, 10:30 PM
| eBay Motors #10 (permalink) |
| Junior Member Join Date: Oct 2012
Posts: 62
| Here's where I'm at now: 1. Showed P1631 Code-Anti Theft Code at cranking. We deleted it and then tried to crank again and it still showed up. Attempted to reprogram the anti-theft system but haven't gotten to use my friends scanner again to see if its cleared yet. I've got to get this cleared because I believe it cuts the fuel to the injectors if this code is showing. **FIXED** 2. Truck is cranking really slow and pulling the voltage gauge down towards 9 when I try to crank the engine. Installed a brand new pass batery and rebuilt starter today from O'Riellys and it helped a little bit but not much. The old starter was showing some age! **FIXED**
__________________ 2002 Chevy Duramax-Crew Cab 4x4 SB IT RUNS!! Last edited by Cowansauto; 12-23-2012 at 06:40 PM. |
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