code 43 on chevy 1500


Old 07-07-12, 07:41 PM
Thread Starter
Join Date: Jul 2012
Posts: 1
code 43 on chevy 1500

I have a 1990 chevy 1500 5.7 v8 that runs very well but is the afternoon on my way home the check engine light comes on i scannned it its code 43 ot only comes on when its hot and then its very sluggish, it takes a little bit for it to get up and go can anyone help thanks.
Sponsored Links
Old 07-09-12, 05:31 PM
the_tow_guy's Avatar
Group Moderator
Join Date: Feb 2001
Location: SW Fla USA
Posts: 11,589
Took me a few minutes to figure the code out, because depending on the year/engine/vin code it comes up O2 sensor or knock sensor. Near as I can tell on your year/engine it's knock sensor; defective sensor might be retarding your ignition timing in response to a knock that doesn't exist. The sluggishness could be retarded timing. The sensor is cheap and easy to replace; should be screwed into the side of the engine block on the passenger side. Can also be wiring or connectors.

43 The ECM did not detect a knock signal during near wide open throttle operation with coolant temperature above 194 F or the knock signal was present for 5 seconds or more during normal engine operation.

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Thread Tools
Search this Thread
Display Modes