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1999 Chevrolet S-10 Hesitation problems

Tiny
TIREMAN TONY
  • MEMBER
  • 1999 CHEVROLET S-10
  • 93,000 MILES
My 1999 chevy s-10 with a 4.3 vortec hesitates unless you hold the fuel pedal to the floor, code reads low voltage to o2 sensors. I've replaced all 3 o2 sensors, new plugs, wires, distributor cap, rooter Button, throttle control sensor, themperature control sender, and took the egr valve off and cleaned it out. Nothing has helped, it idles smooth, runs good other than hesitating. Runs good as long as you hold the fuel pedal to the floor but if you let off the pedal any at all it hesitates. I've already spent a fortune on my truck but nothing helps. Can u help?
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Tuesday, October 8th, 2013 AT 2:54 PM

18 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Have you checked for vacuum leaks? Are you sure the wiring to the sensors isn't damaged, melted, corroded?
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Tuesday, October 8th, 2013 AT 5:36 PM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
I replaced 2 vacum hoses and couldn't find anything wrong with any of the others, I checked the wiring to the o2 sensors as far as I could get to when they go into very tight places. Couldn't find any problems.
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Tuesday, October 8th, 2013 AT 5:43 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Have you checked intake vacuum? There could be an issue with the intake gasket. (Just trying to eliminate things that could cause this.)
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Tuesday, October 8th, 2013 AT 5:48 PM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
That I havnt tried but I will tomarrow, thank u very much for your time. I really appreciate it very much.
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Tuesday, October 8th, 2013 AT 6:01 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
I'm happy to help. Keep in touch so I know what you find.

Joe
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Wednesday, October 9th, 2013 AT 8:41 AM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
I checked intake gasket and all bolts, could not find any problems. I rechecked all vacum lines and found no problems, I even sprayed starter fluid all around intake while engine running to see if the engine would speed up. Found nothing, nothing has helped, it's throwed another code. I won't be able to hook it until tomarrow but I guarantee it will show low voltage to o2's like it always has, I have no clue what else to do. Any other ideas my friend?
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Wednesday, October 9th, 2013 AT 3:08 PM
Tiny
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  • MECHANIC
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Have you checked to see if, in fact the voltage is low to the sensor? Have you wanted the response of the O2 sensor using a live data scanner?
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Wednesday, October 9th, 2013 AT 6:02 PM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
That I haven't done, I'm afraid that's above my means. I'm not actually a mechanic. I just can't afford to take it to a shop so I have to do my own work, I have a little knowledge but I don't have any of the higher end equipment. I've just reached the end of my knowledge, I just don't know what else to do to it.
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Wednesday, October 9th, 2013 AT 6:19 PM
Tiny
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Can you gain access to a live scanner?
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Wednesday, October 9th, 2013 AT 6:57 PM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
Not that I'm aware of, to be honest I've never heard of one.
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Wednesday, October 9th, 2013 AT 7:09 PM
Tiny
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  • MECHANIC
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Is there an Auto Zone or Advance Auto near you?
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Thursday, October 10th, 2013 AT 9:18 AM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
Yes theirs a advance and an autozone.
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Thursday, October 10th, 2013 AT 4:44 PM
Tiny
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As long as you are not in California, either one should have a scanner to check codes and they don't usually charge to do it. See if one of them have a scanner that can read real time data so you can see how the sensor is reacting.

Let me know what you find.
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Thursday, October 10th, 2013 AT 4:54 PM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
Ok thanks, I'll check into that. I appreciate your time in this matter.
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Thursday, October 10th, 2013 AT 4:56 PM
Tiny
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Glad to help. I have to laugh at your user name. We have a guy at work that is responsible for any and all tire related issues. His name is Tony also. We call him Tireman Tony.

What are the chances.

Let me know what you find.
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Thursday, October 10th, 2013 AT 5:01 PM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
That is funny, I change large tires on the off road equipment in a major coal mine.
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Thursday, October 10th, 2013 AT 5:04 PM
Tiny
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That has to be a tough job!
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Thursday, October 10th, 2013 AT 5:19 PM
Tiny
TIREMAN TONY
  • MEMBER
  • 10 POSTS
It can be sometimes, especially in the winter time.
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Thursday, October 10th, 2013 AT 5:42 PM

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