Trouble codes

Tiny
BARBQDUDE
  • MEMBER
  • 1993 CHEVROLET LUMINA
  • 6 CYL
  • AUTOMATIC
I have a 1993 Chevy Lumina sedan with 144,000 miles on it. I have replaced the coils and ignition module. It still runs rough. These are the trouble codes I got: 21-Throttle position sensor, voltage high.
35-Idle speed control circuit. 43-Knock sensor circuit.
53-System over voltage. Can you please tell me what these codes mean?
Friday, April 8th, 2011 AT 4:42 PM

2 Replies

Tiny
SATURNTECH9
  • MECHANIC
  • 30,869 POSTS
The first code you should address is the 53 over voltage before it causes any damage.I would have the alternator and battery tested and go from there. Let me know what you find and we will go from there.
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Friday, April 8th, 2011 AT 5:35 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
If you have a digital multimeter, we can test some of these issues.

Clean the throttle body and iac, does it idle ok? How about off idle, does it run ok down the road?
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Friday, April 8th, 2011 AT 5:39 PM

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