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'99 K1500 Suburban Hesitates

FergusonT

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FergusonT Enthusiast

FergusonT

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I am new to this forum, but I have been on the GMTruck club forum for about a year and have posed this scenario to them recently.

 

I just did a tune up on my k1500 suburban, this is the kit I used. http://www.summitracing.com/parts/ACC-TST3/

 

plugs, wires, rotor, and cap.

 

Before i did this tune up I had problems with hesitation when giving it more than half throttle, such as if you were on the on ramp getting up to highway speed. I still have this problem after doing the tune up. I also cleaned the mass air flow sensor.

 

Some things I am thinking are, fuel pressure, maybe a new mass air flow sensor, throttle position sensor....I dont have a check engine light so no codes to pull. Any thoughts on where I should start, how to diagnose this. Thanks!

txab Senior Enthusiast

txab

Posted
Posted

Look at your fuel pressure regulator. Remove the vacuum tube and see if you have fuel present. If so, replace.

 

Also take a fuel pressure reading. Key on engine off, pressure should be 60-66 psi

 

Did you change the fuel filter?

FergusonT Enthusiast

FergusonT

Posted
  • Author
Posted

I did not replace the fuel filter. Where is the fuel pressure regulator located, and how can it be tested. Will they do a test at a parts store like Advance Auto Parts.

txab Senior Enthusiast

txab

Posted
Posted

IIRC, it is located on the drivers side of the intake. FP regulator looks something like this:

 

fuelpressurereg.jpg

 

The main way of testing is the presence of fuel in the line as explained above.

 

Most parts stores will "loan" you a pressure gauge to test fuel pressure

FergusonT Enthusiast

FergusonT

Posted
  • Author
Posted
IIRC, it is located on the drivers side of the intake. FP regulator looks something like this:

 

fuelpressurereg.jpg

 

The main way of testing is the presence of fuel in the line as explained above.

 

Most parts stores will "loan" you a pressure gauge to test fuel pressure

 

Alright, thanks! I was so stressed out yesterday, doing that tune up, then not seeing the results I expected....Maybe I am a newbie, but those plugs and wires were not easy to get at.

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