1998 Chevy Silverado engine bogging

Tiny
MSTELL
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • V8
  • 2WD
  • AUTOMATIC
  • 21,100 MILES
My 98 pickup(350) has started bogging when accelerating at any speed. I can get up to highway speed if I take my time doing so but as to merge into traffic the engine will fall on its face. The fuel pump was replaced six weeks ago along with a new fuel filter. I installed a pressure gauge on the fuel line and ran it along the windshield while I was driving. I had a consistant 52 psi even when it started to bogg when I accelerated hard.
Wednesday, November 12th, 2008 AT 9:47 PM

9 Replies

Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
When was the last time you had a tune up
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Thursday, November 13th, 2008 AT 9:29 AM
Tiny
MSTELL
  • MEMBER
  • 4 POSTS
It has about ten thousand miles since the last tune up
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Thursday, November 13th, 2008 AT 10:50 AM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Disconnect your maf sensor and test drive it and see if it makes a difference
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Thursday, November 13th, 2008 AT 10:56 AM
Tiny
MSTELL
  • MEMBER
  • 4 POSTS
Tried that, we had a 97 next to mine and exchanged the sensors but the problem was still on my truck.
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Thursday, November 13th, 2008 AT 11:39 AM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
What engine do you have
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Thursday, November 13th, 2008 AT 11:42 AM
Tiny
MSTELL
  • MEMBER
  • 4 POSTS
5.7L Vortec
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Thursday, November 13th, 2008 AT 12:08 PM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
When you did the tune up, did you replace the cap and rotor. Do you have access to a scanner. I would like to know what your o2 sensors are reading
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Thursday, November 13th, 2008 AT 12:32 PM
Tiny
MSTELL
  • MEMBER
  • 4 POSTS
In the last tune up cap, rotor, plugs and plug wires were replaced. Last week before this all started I did had a check engine light on. The codes were for the left and right bank upstream O2 sensors reading lean. The light was reset and has not come again.
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Thursday, November 13th, 2008 AT 1:05 PM
Tiny
RHALL77
  • MECHANIC
  • 3,361 POSTS
Posible low fuel pressure or a vacuum leak
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Thursday, November 13th, 2008 AT 1:17 PM

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