Check all your vacuum lines. if there is a vacuum leak, the truck will crank, but not start. if you need a vacuum diagram, go to www.autozone.com create a profile it's free, add vehicle. put in the info of your dodge ram. then from the main screen, where it says select a category, select vehicle repair guide. on the next screen select emission controls. on the next screen where it says select a chapter, select vacuum diagrams. as you scroll down just click on the diagram for your engine. hope it helps. good luck.
SOURCE: belt diagram 2004 5.7 liter engine dodge ram 1500 1/2 ton 4x4
click on this link, and scroll down to 5.7L
http://www.autozone.com/shopping/repairGuide.htm?pageId=0900c152800ba71e
SOURCE: 1999 ram 1500
the part numbers are totally different between the 2 yrs....its almostn imposible to determine....you may contact a wrecking yard they may have another way to determine if they interchange
SOURCE: 1999 Dodge Ram 1500 Pickup error code p0171
This code means that system to lean, bank 1.
some of the possible causes to make this code set are
1. intake or exhaust leak,
2. problem with the air system.
3. MAF (Mass Air Flow sensor)VAF sensor (Volume air flow sensor)
4. fuel pressure/pump
5. injector(s)
6. HO2S (Oxygen sensor)
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check all your vacuum lines. if there is a vacuum leak, the truck will crank, but not start. if you need a vacuum diagram, go to www.autozone.com create a profile it's free, add vehicle. put in the info of your dodge ram. then from the main screen, where it says select a category, select vehicle repair guide. on the next screen select emission controls. on the next screen where it says select a chapter, select vacuum diagrams. as you scroll down just click on the diagram for your engine. hope it helps. good luck.
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