[urq] Update on my MAC-02, stuck duty cycle problem

[alexander stickler]

Hi guys,

Thank you to all of you who came through with an offer
to loan me a MAC-02 to diagnose my fuel injection
problem whose major symptom is running rich, and with
the duty cycle stuck at 50% even with some throttle.
It stays at 50% until the full throttle switch bumps
it to 76%.

I swapped Mike Hopton's later MAC-02 in, which worked
beautifully after disconnecting the wire at pin 2 and
swapping #5 and #6. 

However, the duty cycle is still stuck at 50%.

The 02 sensor works, I've got voltage there (small
voltage). The idle switch is closed and functioning at
idle and the full throttle switch closes when
triggered. Unless Mike's loaner ECU is equally bad,
the ECU does not appear to be at fault.

So, what the heck else could put the duty cycle into
'protect' mode and keep it from changing except when
trigger by the FT switch?

The car's in the garage for the winter, but 'I need
closure.' 

Any thoughts on this would be greatly appreciated.

Cheers,

Alex
'83 URQ


	

	
		
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