I am having a problem with my car and spark retard. The computer is pulling out timing, up to 20*, in a certain RPM range and then it returns to normal. The RPM range in question is about 1400-1900. After the engine gets passed 1800 RPM the retard stops pulling out timing. By 1900 it is gone, and the engine begins to have power once again. It is very annoying to say the least.

I disconnected the knock sensor and turned off the diagnostic in the PROM. On a test drive I got no spark retard. This tells me it has something to do with the knock sensor and or the ESC.

Help me out. What does anyone think? Thanks...

BTW, I have a similar question posted in the DIY PROM...

Ryan

 

One of the fixes for some is to swap to a different ESC module, one that is less sensitive to false knock conditions.

P/N 16038331 is the one to go with.

Also, verify that your base timing is correct.

Hope this helps.

Jake