Trouble codes

1993 CHEVROLET LUMINA

6 CYL • AUTOMATIC

BARBQDUDE

MEMBER
3 POSTS
FOLLOW

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?

Apr 8, 2011 at 4:42 PM

SATURNTECH9

CAR REPAIR CONTRIBUTOR
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.

Apr 8, 2011 at 5:35 PM

JDL

CAR REPAIR CONTRIBUTOR
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?

Apr 8, 2011 at 5:39 PM

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