Jump to content

engine surging/pulsing...

DucatiSSsp

By DucatiSSsp
in Ask A GM Technician

Recommended Posts

DucatiSSsp Enthusiast

DucatiSSsp

Posted
Posted

Hi Mr. Tech

Just bought a 06 sierra 1500 4x4 5.3 special edtion package. Noticed at steady 50mph I'm getting a slight engine FI pulsing. Also this truck does not seem to get up and go like a coworkers chevy 5.3. I really have to stomp it to the ground to get it to kick in and go. only one time have I stomped on it and it responded like i think it should. still less than 500 on the odo. I am planning on taking it in soon but would like your opinion. truck seems to run fine otherwise but above 2k rpm seems lethargic.

TIA,

Bryce

GM-Tech Senior Enthusiast

GM-Tech

Posted
Posted

Without actually experiencing it myself, and with only your perception rather than some hard diagnostic facts, it is hard for me to form an opinion. What you feel is lethargic may seem perfectly normal to me.

 

Don't compare to your buddy's truck unless it is identical in every respect. Same year, gearing, 4x4, etc. Even if it's an identical truck in all those areas, there are still some manufacturing tolerance differences that could make one vehicle operate slightly different than another truck.

  • 1 year later...
High Mileage Enthusiast

High Mileage

Posted
Posted

Hi Mr. Tech

Just bought a 06 sierra 1500 4x4 5.3 special edtion package. Noticed at steady 50mph I'm getting a slight engine FI pulsing. Was this problem ever resolved? I've got an 02 doing the same thing. At around 1500 rpm it is really noticable. It seems like the tourqe converter is sliping in and out of lock up as I can see the tach fluctuating 50 to 100 rpms. Hope you can respond. Thanks

  • 1 month later...
Mo Mason Enthusiast

Mo Mason

Posted
Posted

I have a 2000 Silverado 4X4 Z71 5.3L that surges between 40-50 mph. The tach fluctuates 50-100 rpms. I can hear the engine surging it is very noticeable, nothing imagined. At highway speed 70-80 mph there is NO surging. I can smoke the tires off the line, no problem. Even get second gear scratch sometimes, no problem. But just trying to hold a steady 45 mph and it surges up and down. I have replaced the fuel pump and fuel filter. Put a pressure gauge on it and it goes to 50 psi and holds there, at idle. Any ideas appreciated.

 

MO

Mo Mason Enthusiast

Mo Mason

Posted
Posted
I have a 2000 Silverado 4X4 Z71 5.3L that surges between 40-50 mph. The tach fluctuates 50-100 rpms. I can hear the engine surging it is very noticeable, nothing imagined. At highway speed 70-80 mph there is NO surging. I can smoke the tires off the line, no problem. Even get second gear scratch sometimes, no problem. But just trying to hold a steady 45 mph and it surges up and down. I have replaced the fuel pump and fuel filter. Put a pressure gauge on it and it goes to 50 psi and holds there, at idle. Any ideas appreciated.

 

MO

 

At first I thought this to be fuel related but I am beginning to think it maybe a transmission problem. Vacuum leak? Don't know where to go from here. Somebody point me in the right direction. Please.

Archived

This topic is now archived and is closed to further replies.

Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.

  • Forum Statistics

    250.6k
    Total Topics
    2.7m
    Total Posts

  • Member Statistics

    343,007
    Total Members
    8,960
    Most Online
    Brendan C
    Newest Member
    Brendan C
    Joined

  • Who's Online   1 Member, 0 Anonymous, 1,143 Guests (See full list)

  • Latest Articles

  • Posts

    • Grumpy Bear
      Joke Thread

      By Grumpy Bear · Posted

    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      You're better read than that Atlas. 😏   British science fiction writer Arthur C. Clarke formulated three adages that are known as Clarke's three laws, of which the third law – that "any sufficiently advanced technology is indistinguishable from magic" – is the best known and most widely cited.   Stribeck and the pivotable Hersey Number isn't voodoo nor snake oil. That part is physics. It's what marketing and bean counters do with it that is snake oil and voodoo.    Stribeck is the relationship between Hersey and the Coefficient of Friction. Within the Hersey Equation if viscosity and viscosity is 'Dependent' on.......heat.......and.......viscosity index or the temperature to viscosity slope.    Specifically Hersey is the viscosity AT THE TEMPERATURE IN THAT LOCATION FOR THAT SLOPE.   Hydrodynamic lubrication exist when the film thickness in the location is 3X the Ra roughness of the surface. This is irrespective of the hardness of the substrate. To obtain that thickness X viscosity is required for Y velocity at Z load. That's a lot of moving parts. It is also impossible to maintain in an ICE but nearly possible with a turbine under constant load.    What does that mean? Error heavy and operate light. Wear is inevitable but the rate of wear and the milage obtainable are a function of prevailing conditions and HABITS. The only penalty is viscous drag and at fractions so low as to be well worth the effort. Double the life, half the manufacturing carbon foot print. Greed is the only impediment.    The materials generated by SwRI are the RESULT not an estimation or a hypothesis.    Don't delude yourself sir, EV's have as many pitfalls as ICE's. We just don't know what they are yet and it will take longer to sort as MARKETING and GREEDY CEO's have had more time to polish the turd they are selling. 
    • Grumpy Bear
      The Peckish Synapse

      By Grumpy Bear · Posted

      You can always count on greed to prey on ignorance and stupidity.    Friend bought a 2019 Ford Flex and asked me about using Valvoline R&P 5W30 in it. Told him give the miles on it and the fact it wasn't yet using oil that it was a good plan. He uses a Valvoline quick change shop for his oil service.   First they tell him that isn't the oil the OEM recommends. He told them he didn't care what the OEM thought. Then they floated the, "But it will void your warranty"    His reply was it's a 2019, there is no warranty and informed them their knowledge of the law was lacking.    Then they tell him 'But it will ruin your motor"!.    Mine to ruin he says. Finally they give in and charge him 150% the semi-syn price    Point it the brainwash is so embedded that even the service industry is drunk on their swill. The public is right behind them. Echoing the same lies on every forum and media platform. If the end goal is indeed EV then I'd say that ship is about built. 
    • CamGTP
      Gas Prices

      By CamGTP · Posted

      Diesel hit $6.00 here today at the truck stop.   Payed $2.79 for E85 today too.
    • richard wysong
      Electrical Problem - solved

      By richard wysong · Posted

      Thanks for posting, I'm sure it will help someone

  • GM-Trucks.com Clubs

  • Popular Contributors

×
×
  • Create New...