Set idle to 1000 RPMFrom this link, the Fiero 4-cylinder ECM does the same, but adds:.Bypass RPM and Temperature criteria for ESC enable.Since you can see the timing advance in the ALDL stream, it surly doesn't make sense that the timing advance is inhibited.īoth theoretically and based on personal test experience, I would confidently say that ALDL mode does not turn off timing advance. I question does the ALDL mode eliminate the timing advance. I would think both operate the same, but who knows? If you have input, but if it's about the duke ECM, please make that clear in your post.
86 s10 blazer aldl mode simulator#
I am not running a stock 1227170 right now, but I can set one up on my test ECM engine simulator and see what I get for an output.Īlso are there other changes that happen when the ECM is in ALDL mode? I haven't confirmed this, but my 'thought experiment' says it should work this way. Since you can see the timing advance in the ALDL stream, it surly doesn't make sense that the timing advance is inhibited. When the ECM is in ALDL mode, the ECM will output data via the ALDL connector. This is accomplished by placing a 10K resistor between pins A-B. Also the SES light flashes to indicate if the current mixture is rich or lean.Īlso in diagnostic mode, WHEN THE ENGINE IS OFF, the ECM fully extends (closes) the IAC motor, and flashes the SES codes. In diagnostic mode, WITH THE ENGINE RUNNING, timing advance is disabled. One I will call 'diagnostic mode' - This is accomplished by shorting pins A - B. I believe most on here know there is more than one mode that the stock V6 Fiero ECM can be placed in.