Code 41

[limey]

Briefly, Accessing the Cluster information 4.0 I get a code 41, Car runs awful.

Aftermarket PROM in the car, ported top end, new injectors, just replaced the ECM with known good unit.

Any ideas?

[ALZR1]

Originally Posted by limey

Briefly, Accessing the Cluster information 4.0 I get a code 41, Car runs awful.

Aftermarket PROM in the car, ported top end, new injectors, just replaced the ECM with known good unit.

Any ideas?

Check to see if your prom is inserted correctly.

AL.

[ALZR1]

Originally Posted by ALZR1

Check to see if your prom is inserted correctly.

AL.

here is the chart.

[XfireZ51]

Limey,

Is the notch on the prom pointed towards the outside shell of ECM? Just turn ignition key to ON. SES should flash once then stay on. If it flickers, something wrong w prom. Also, aftermarket prom, is it using correct MY Mask ID, ie $8EA(90), AFA(91), D0A(92), F0A(93-95)?