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1998 Chevy S-10 Car surges only at a specific throttle posi

Tiny
SLOWROLL22
  • MEMBER
  • 1998 CHEVROLET S-10
  • 4 CYL
  • 2WD
  • MANUAL
  • 237,000 MILES
Vehicle has a surge/stalling type issue only at a certain throttle position. The strange thing is it is only while under a load. If in neutral, the whole range of throttle is fine. I have cleaned the TPS, and replaced most of the vacuum hose, changed plugs and wires, and the problem still exists. Any ideas?
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Thursday, January 17th, 2008 AT 2:13 PM

1 Reply

Tiny
PEAR69
  • MECHANIC
  • 1,482 POSTS
A TPS should never be cleaned--it is an electrical variable potentiometer. Internal lubrication is important in a TPS. However, this may be your IAC valve or your MAP sensor.
Check the function of the throttle itself--by hand with the engine off. Sometimes the throttle shaft inside the throttle body wears out. The throttle should open smoothly with no sticking.
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Thursday, January 17th, 2008 AT 11:16 PM

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