Low power

Tiny
LARRY BARNES
  • 1996 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 15,000 MILES

Changed from 305 to 350. Bored 49 over with boat towing cam, vortex engine all important parts, cam sensor, crank sensor, spider injectors, distributor on and on. All new not a lot of power stumbles on cold take off unless mid grade gas no codes on computer help 40 over not 49 sorry.

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Sunday, May 28th, 2017 AT 12:56 PM

9 Replies

Tiny
HMAC300
  • EXPERT
  • 49,657 POSTS

Check fuel pressure with a gauge. It may be because of cam with no reprogramming of computer fuel pressure should be 60-66 psi. also, check for vacuum leak. auto parts rent gauge. See link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

and

https://www.2carpros.com/articles/engine-has-low-power-output

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-1
Monday, May 29th, 2017 AT 6:17 AM
Tiny
ROGER DELAWDER
  • 1996 CHEVROLET SILVERADO
  • 5.0L
  • V8
  • 4WD
  • AUTOMATIC
  • 200,000 MILES

Engine has low power and excessive vacuum on engine. Cannot hardly remove oil cap with engine running and keeps pvc valve closed because of the high pressure

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Tuesday, May 30th, 2017 AT 10:22 AM (Merged)
Tiny
HMAC300
  • EXPERT
  • 49,657 POSTS

Scan for codes and check fuel pressure with a gauge auto parts rent it. this may be something with low fuel pressure. normally engines have pressure while running not vacuum. it may be something broken in valve cover letting it suck to much air or a breather is plugged on other line going to throttle body. see link. for fuel pressure.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

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Tuesday, May 30th, 2017 AT 10:22 AM (Merged)
Tiny
CHRISR
  • 1996 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 250,000 MILES

1996 Chevy K2500 5.7 liter Vortec low on power - getting lean codes p0171 and p0174 with good fuel pressure. I attached a vacuum gauge and am getting 15" at idle - when you give it gas the gauge drops to zero. Could this be plugged cats or another problem?

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Tuesday, May 30th, 2017 AT 10:22 AM (Merged)
Tiny
WRENCHTECH
  • EXPERT
  • 20,803 POSTS

It has the symptoms of a plugged up Catalytic converter but double check the fuel pressure. This is a high pressure system that is very pressure sensitive. It requires over 55PSI at all times.

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Tuesday, May 30th, 2017 AT 10:22 AM (Merged)
Tiny
  • 1996 CHEVROLET SILVERADO
  • 190,000 MILES

My 1996 chevy 1500 bogs down when pedal is floored, what could be wrong?

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Tuesday, May 30th, 2017 AT 10:22 AM (Merged)
Tiny
RASMATAZ
  • MEMBER

Do you have a check engine light? If not-Go to this walk thru link and then let me know- http://www.2carpros.com/articles/engine-hesitates

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Tuesday, May 30th, 2017 AT 10:22 AM (Merged)
Tiny
LORINBREAST
  • 1996 CHEVROLET SILVERADO

Engine Performance problem
1996 Chevy Silverado V8 Four Wheel Drive Automatic 250000 miles

why is my truck burning too much fuel, after giving complete tune up

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Tuesday, May 30th, 2017 AT 10:23 AM (Merged)
Tiny
RASMATAZ
  • MEMBER

Could be caused by the following a bad O2 sensor, excessive fuel pressure (bad fuel pressure regulator or plugged return line), leaky fuel injectors, dirty air filter or restricted air inlet, or a defective coolant sensor that prevents the engine management system from going into closed loop mode

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Tuesday, May 30th, 2017 AT 10:23 AM (Merged)

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