Been doing a lot of reading and investigating for the old 1128 and 1130 codes!
Seems it is very common.
I know MAF and vacuum leaks.
What are the ideal specs at idle?
Do my readings make any sense?
A/C off - MAF = 2.75 g/s (10 kg/hr) @ 730 rpm, Post Cat O2's = steady 0.73 v to 0.74 v
A/C on - MAF = 4.0 g/s (14.4 kg/hr) @ 700 rpm
The 2.75 g/s tells me there is not enough air flowing, but the 0.73 v O2 says exhaust is rich? Is this correct?
I understand the A/C is adding load.
Is the throttle opening up more with the A/C to compensate giving a higher air flow?
MAF was cleaned, even swapped with a new one - no difference.
AOS and Dip Stick tube (found slight crack) also replaced - no difference.
Check for obvious leaks / disconnected hoses...etc.
Before I go pay for a smoke test, just wanting to understand what everything should be.
Thanks in advance!