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Rough Running Engine

Tiny
JIM SPRAGUE
  • MEMBER
  • 4 POSTS
Only came on once when I floored it, light stayed on for 2hours and it idled w/out fluttering once, when I started it next day back to fluttering when warmed up
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
You need to have the codes read first to give you a starting point.
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
JIM SPRAGUE
  • MEMBER
  • 4 POSTS
When engine running rough there is no check engine light on, although code should be under history of codes correct?
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
JACK D MONASMITH
  • MEMBER
  • 4 POSTS
  • 1998 CHEVROLET SILVERADO
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 210,000 MILES
Engine idles fine in driveway. When it is being driven, I can go about two block before it starts to spit and sputter as if its not getting gas.
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
The light doesn't have to be on. It has a memory as long as you don't disconnect the battery. You may need a professional scan tool for that one though. That is a transition year.
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning my name is Roy and I will assist.

The first thing I would do is to check the fuel pressure. Sounds like a failing fuel pump. You can rent a tester at a parts store.

Roy
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
JIM SPRAGUE
  • MEMBER
  • 4 POSTS
New on computers having trouble here. Figured it out. Thanks for the help!
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
RENEE L
  • ADMIN
  • 1,257 POSTS
Hi Jack,

Here is a link to an article from this site that features written instructions and pictures showing and explaining the process of checking the fuel pressure yourself. If you decide you would like do this yourself you can purchase a fuel pressure gauge online from sites like Amazon.com.

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

Thank you for visiting 2CarPros.

Kindest regards,

Renee
Admin
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
JACK D MONASMITH
  • MEMBER
  • 4 POSTS
Fuel pressure is 58psi. Spec is 55. I have no engine check light or codes at all.
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,882 POSTS
I am just putting in my two cents to see if you have installed spark plug recently? Here is a guide that can help you:

https://www.2carpros.com/articles/engine-misfires-or-runs-rough

Please let us know what you find.

Best, Ken
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
JACK D MONASMITH
  • MEMBER
  • 4 POSTS
I have not replaced my plugs lately, no.
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
KRC1963
  • MEMBER
  • 1 POST
  • 1999 CHEVROLET SILVERADO
  • 5.0L
  • V8
  • 2WD
  • AUTOMATIC
  • 222,000 MILES
Always starts ok. When I drive away immediately after starting, it will barely move and runs Very rough and Service engine light flashes; but if I let it idle for 10-15 minutes before driving, it runs fine. Fuel Injection 'spider' and fuel pressure regulator were just replaced
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
JOHNNYT73
  • MECHANIC
  • 924 POSTS
You need to count the flashes to read the code. Should be quick flashes at first to tell you the first digit and then a pause, then more quick flashes for the second digit.
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,882 POSTS
Hey Jack,

Thats where I would start here is a guide to help you.

https://www.2carpros.com/articles/how-to-change-spark-plugs

Please let us know happens so it will help others.

Best, Ken
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Friday, October 19th, 2018 AT 11:40 AM (Merged)
Tiny
ALASKABOBB
  • MEMBER
  • 2 POSTS
I am tellin' you, if your Vortec has more than 100,000 miles eliminate the distributor by replacing it, only $35 on eBay it is billet aluminum and comes w/ cap and sensors, these plastic distributors all go bad and produce a wide range of faults and loss of power.
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Friday, October 19th, 2018 AT 12:06 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 42,882 POSTS
Good to know Bob. Let us know if we can help again.

https://www.2carpros.com/questions/new

Cheers, Ken
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Saturday, October 20th, 2018 AT 9:45 AM

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