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1999 Chevy S-10 Hesitation

Tiny
TREYFOX33
  • MEMBER
  • 1999 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 125,000 MILES
I have a bad hesitation the first time I take off. Between 1000 and 2500 rpm it seems to bog and stutter real bad. Once I get passed 2500 its Fine. Then the rest of the trip its fine. If I stop for more that 5 minutes its back. I have changed the fuel filter, dist. Cap and rotor, plugs and wires.

Any ideas?
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Monday, April 6th, 2009 AT 2:16 AM

10 Replies

Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
Sounds like throttle position sensor (TPS). You can check it with an ohmmeter to see if it's nice and smooth throughout it's range.
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Monday, April 6th, 2009 AT 8:13 AM
Tiny
TREYFOX33
  • MEMBER
  • 5 POSTS
I am pretty handy with a DIMM, What kind of resistance should it read? I will go get it off my truck tonight and check it out.
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Monday, April 6th, 2009 AT 9:12 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
With the DVOM you're looking for a smooth rise and fall of the resistance. For some reason I can't bring up the pin connections and ohm readings. I'll try again in a bit. Attached is the voltage readings.


https://www.2carpros.com/forum/automotive_pictures/248092_chevy_S10_1.jpg

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Monday, April 6th, 2009 AT 11:35 PM
Tiny
TREYFOX33
  • MEMBER
  • 5 POSTS
I checked and I do have a bad spot in the TPS. However I also hooked up a fuel pressure testor and when I prime the pump, I get 60psi. Then when the pump shuts off, it drops to 0 psi real fast.
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Monday, April 6th, 2009 AT 11:55 PM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
You've got a bad regulator. It shouldn't go over 42lbs and not drop below 30. Over time it may bleed down, but not drop instantly.
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Tuesday, April 7th, 2009 AT 1:10 AM
Tiny
TREYFOX33
  • MEMBER
  • 5 POSTS
Are you sure about the 34 psi? I have found many sources that say 60-66 psi. Also, how can I rule out the checkvalve in the fuel pump?
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Tuesday, April 7th, 2009 AT 3:04 AM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
I stand corrected. On the 4.3, 5.0 and 5.7, it IS 60 to 66 lbs. I don't know what I was looking at. Forgive me.
When you hit the key the first time does the gauge jump right up to 60 lbs?
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Wednesday, April 8th, 2009 AT 2:06 AM
Tiny
TREYFOX33
  • MEMBER
  • 5 POSTS
Yes it jumps right to 60 psi. Actually, I replaced the TPS, and it was bad, but it did not fix the problem. I also decided to clean the MAF. It Fixed the problem. I still think there is a problem with the fuel system not holding pressure but It runs good and I will address the fuel problem if it starts causing problems.

Thank you for your help!
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Wednesday, April 8th, 2009 AT 6:23 AM
Tiny
JAMES W.
  • MECHANIC
  • 2,395 POSTS
The specs show the fuel pump pressure not to go below 30 psi on the 2.2 and the 3.4. On the 4.3, 5.0 and 5.7 it doesn't give any specs for shutdown pressure. But, as long as it "jumps" to 60 psi, I'd say you're ok.
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Wednesday, April 8th, 2009 AT 10:20 AM
Tiny
TURNEDWRENCH
  • MEMBER
  • 13 POSTS
Replace the fuel pump. Alldata and Mitchell say the pressure should be between 60-66psi. Actually it needs to be much higher. More like 90psi.
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Wednesday, April 29th, 2009 AT 9:52 PM

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