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Surging only when accelerating after warms up

Tiny
CORY BARNETT
  • MEMBER
  • 1988 GMC C1500
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 156,000 MILES
Okay, I am not a dummy so from the start I have replaced all sensors, wires and hoses related to the fuel/air systems. The only thing I have not done is replace the fuel pressure regulator. My truck surges only when in drive and only after it warms up. The first five minutes she runs great. I took the TBI off and cleaned the injectors and noticed the spring in the fuel pressure regulator is stuck. Could this cause the surge? I figured if it was the for it would also surge in park. I am stuck any suggestions or actual answers. The truck is my only means of transportation I need her back on the road.
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Saturday, January 7th, 2017 AT 2:49 AM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Try cleaning throttle plate on both sides and IAC hole with choke cleaner if you have not already. then check fuel pressure with a gauge auto parts rent it, see link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Saturday, January 7th, 2017 AT 6:59 AM
Tiny
STEVE W.
  • MECHANIC
  • 12,998 POSTS
The sticking regulator could cause it and it likely would act worse under load.
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Saturday, January 7th, 2017 AT 10:22 AM

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