Surging during acceleration

Tiny
JEFFERY PFLUM
  • MEMBER
  • 2000 CHEVROLET EXPRESS
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 160,000 MILES
I noticed my vehicle had started surging and sort of shifting strange when accelerating from a stopped position at a light or stop sign. I wasn't concerned at first until it kept on happening. The other day coming home I saw my odometer was floating around and registering around 85 when I was going under 60. Although it fluctuates wildly between the correct speed and 20 above what it is, but it still seems to go up and down in the correct direction when I accelerate and stop. Does this sound like a computer problem? No check engine light as of now. I drove it today a couple of miles, no odometer problems just slight drag or surging. Going tomorrow to put on scope
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Sunday, May 5th, 2019 AT 9:38 AM

3 Replies

Tiny
KEN
  • ADMIN
Hello,

It sounds like the fuel pump can be getting weak but to be sure here is a guide to help confirm the issue.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

Please run down this guide and report back.
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Monday, May 6th, 2019 AT 4:01 PM
Tiny
JEFFERY PFLUM
  • MEMBER
Thanks Ken for your suggestion. I did what you told me. Someone I know that is good with this did it and it wasn't the pump (thank God its labor intensive I hear). After the test the problem cleared up for two weeks. Anyway it came back the same and stayed about 5 days and I was driving on a hwy about 55 mph I believe (estimate the speedometer was still fluctuating) and I noticed it was almost at 100. When it hit 100 it shut the engine down for about 2 or 4 seconds until the speedometer dropped below 100 then the engine went back on for 4 or 5 seconds until it hit 100 and shut off again, and continued this way for about two miles until I slowed for a right turn, it kept under a 100 for a half mile and didn't shut off until I got it to a mechanic that was close. This guy is probably the best in town. I told him the same information I told you and he looked puzzled however when I told him about it shutting off and starting again he said he thinks he knows why, the 100 mph kill switch would shut off the engine at 100 mph, then when it went under 100 it started running again. The computer on the fuel injector was corroded and sending bad signals it told the van it was over a 100 mph and it reacted. He got a new one, programmed it, bingo. Thanks for your help, Ken. I hope someone can use this someday.
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Sunday, June 2nd, 2019 AT 2:35 PM
Tiny
KEN
  • ADMIN
Glad you could get it fixed, that kind of problem can be tough. Please use 2CarPros anytime we are here to help.
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Tuesday, June 4th, 2019 AT 10:23 AM

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