Is my alternater bad or what can b the problam bad fuelpump

Tiny
SHOVEITORLEAVEIT
  • MEMBER
  • 1995 GMC SIERRA
  • 200,000 MILES
Everythings good till I turn something on stereo, lights, or heater. Then it feels like a loss of power. Truck will backfire alittle. I gotta kinda put my foot in it to get it to snap out of it.
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Thursday, September 8th, 2011 AT 2:01 AM

9 Replies

Tiny
SATURNTECH9
  • EXPERT
Have your battery tested make sure your battery cables are clean and tight also have your alternator tested. Let me know what you find.
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Thursday, September 8th, 2011 AT 2:14 AM
Tiny
SHOVEITORLEAVEIT
  • MEMBER
Battery is good just got it. The truck ate the other one. Didnt want to take the alternater off less I had to
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Thursday, September 8th, 2011 AT 2:18 AM
Tiny
SATURNTECH9
  • EXPERT
Have the alternator tested on the truck at the auto parts store. Let me know what you find.
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Thursday, September 8th, 2011 AT 2:25 AM
Tiny
SHOVEITORLEAVEIT
  • MEMBER
With the truck off the meter read 12.3 with the truck at idle it said 14.3, Im really at a loss.
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Saturday, September 10th, 2011 AT 12:41 AM
Tiny
SATURNTECH9
  • EXPERT
Now let the truck idle with the meter on it turn on lights ac etc and see what the voltage reads.
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Saturday, September 10th, 2011 AT 2:59 AM
Tiny
SHOVEITORLEAVEIT
  • MEMBER
Its the same.I just drove the truck it pops in the tbi sounds like im not sure but it does backfire, I have to feather tag gas or put my foot in it to get it to run better. The idle is a little irratic. Could it have jumped time maybe. Or is my fuelpump going out. Thank u for all ur advice in helping me figure this out.
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Saturday, September 10th, 2011 AT 3:38 AM
Tiny
SATURNTECH9
  • EXPERT
So is the truck doing this without turning anything on now?
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Saturday, September 10th, 2011 AT 3:43 PM
Tiny
SHOVEITORLEAVEIT
  • MEMBER
Yes I cant go 2 miles without this happening
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Sunday, September 11th, 2011 AT 12:17 AM
Tiny
SATURNTECH9
  • EXPERT
Your going to have see what the fuel pressure is when it happens. Also have you checked the fuel filter to see if its restricted?See what the ohms reading is from the negative battery cable at the battery post to the engine block?
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Sunday, September 11th, 2011 AT 4:07 AM

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