I just put in my speed density 355 TPI with headers, new cam, adjustible fuel pressure regulator, custom PROM, and a few other minor things. Starts and runs, but I get code 43 (electronic spark control) from the check engine light. I haven't a clue as to where to start to fix it. Also, is this code affecting performance in any way at all? ANY help would be greatly appreciated. Thanks.

[This message has been edited by CamaroX84 (edited June 11, 2001).]

 

Also, did all years of TPI come with an ESC? This would be a problem if they didn't because I converted an 89 TPI motor to speed density. Thanks.

 

Basically a code 43 means that the ECM isn't getting a signal from the ESC. That could be due to the knock sensor going bad or not having a good ground or connection, the ESC gone bad or not getting a good connection to the ECM, or the ECM is bad. The ECM will either advance the timing regardless of knock (bad for the engine), or it'll retard it, Killing performance.