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Hesitation and Jumping During Acceleration

mjpatera

By mjpatera
in Troubleshooting & Recalls

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mjpatera New Member

mjpatera

Posted
Posted

I've searched this and other forums and found info about hesitation but not exactly what I'm experiencing.

 

I have a 2014 Silverado Z71 with the 5.3. Engine has 67k miles. The issue I'm having is during light to normal acceleration around 1000-1500 rpm the engine has a bit of hesitation. I can feel it jumping and see the tach also jumping like it's trying to pull through but won't unless I gas it really hard. It does it real bad if I take off at a red light and go through a long turn where I can't accelerate the whole time. The trans shifts up to 2nd gear and as soon as it shifts and the rpm drops to around 1100 rpm, it feels like the truck is running out of gas and will start jumping. The only time I see an issue is in that low rpm range. If I accelerate hard I have no issues and don't feel a lack of power at all. The weird thing is that once I get up to highway speeds (60-65mph) the rpm is in that range where I see the issue but I don't feel it doing it at all. I do a lot of highway driving at that speed and still get 22-25 mpg too. The only time I notice it is during acceleration.

 

I have ran several cans of injector cleaner and seafoam through. I have also tried the valve cleaner that is sprayed through the air intake but neither seemed to make any difference. I have not actually taken off the intake to look inside of it. I have also tried all grades of gasoline from 10+ different stations and couldn't tell any difference.

 

Any ideas on what could cause this?

  • 2 weeks later...
Haus_Z71 Enthusiast

Haus_Z71

Posted
Posted

This sounds exactly like what I experienced. I chalked it up as bad tuning from the factory, invested $600 in the Blackbear Performance tune, and never looked back. The acceleration from low rpm is completely different now. No lagging or bogging down. When taking those slow turns like you said, the new tune keeps the tranny in a lower gear, keeping the power available for when you accelerate out of the turn.

mjpatera New Member

mjpatera

Posted
  • Author
Posted

Thanks for the response. Since I posted this I got a Superchips tuner. When set to "Performance" it helps but I can still feel it a little. If I have it on "Mileage Save" it does it real bad. Sometimes it will barely accelerate at all until it downshifts. I've tried using the datalogging feature but i'm not really sure which values I should look at. I think it's strange that I'm not getting and check engine light or codes when this happens.

Colossus Senior Enthusiast

Colossus

Posted
Posted

Superchips.. eh. You need to go with good tuning like Blackbear.

Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

This sounds exactly like what I experienced. I chalked it up as bad tuning from the factory, invested $600 in the Blackbear Performance tune, and never looked back. The acceleration from low rpm is completely different now. No lagging or bogging down. When taking those slow turns like you said, the new tune keeps the tranny in a lower gear, keeping the power available for when you accelerate out of the turn.

 

$600?!? I thought a tune from BB was around the $300 mark. I've never had one that's just what I had in mind based on some limited internet research. I've been thinking about getting one to wake my truck up because the stock performance is abysmal.

Haus_Z71 Enthusiast

Haus_Z71

Posted
Posted

$600?!? I thought a tune from BB was around the $300 mark. I've never had one that's just what I had in mind based on some limited internet research. I've been thinking about getting one to wake my truck up because the stock performance is abysmal.

$600 was for the EFILive Autocal Tuning System.

http://store.blackbearperformance.com/EFILive-AutoCal-Tuning-System_p_8.html

 

Before the tune, I honestly didn't enjoy driving my truck. I just couldn't stand how the throttle and shifting felt. After the tune, it is a whole new truck. Shifting, throttle, overall performance. It just feels 1000lbs lighter when driving.

Silverado-Hareek Senior Enthusiast

Silverado-Hareek

Posted
Posted

$600 was for the EFILive Autocal Tuning System.

http://store.blackbearperformance.com/EFILive-AutoCal-Tuning-System_p_8.html

 

Before the tune, I honestly didn't enjoy driving my truck. I just couldn't stand how the throttle and shifting felt. After the tune, it is a whole new truck. Shifting, throttle, overall performance. It just feels 1000lbs lighter when driving.

 

Yeah I might need to do this. My truck constantly feels like I'm towing a space shuttle

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