I flunked VA emissions yesterday with high NO. I am using BG44k for the next tank. I also changed the thermostat to the stock 87 degree C. It had a 93 degree C?

I would like to check all base settings before I go for a second try. The timing is good along with all other tune up settings.

This car was my brothers and he had a new air mass meter installed last summer (bad preheat flap). The work was done at a gas station and I feel they did not set up the new AMM properly. On my 85 745t I used a dwell meter at the test port and adjusted the AMM so the meter moved between 30-70.

This 88 240 has a blue connector by the PS fluid with a pink wire and a wire with a stripe. I used the wire with the stripe and got a constant 70 on the dwell. I disconnected the O2 sensor (with engine running) and still got 70 on the dwell? Turning the AMM adjustment does nothing. What am I doing wrong??

I am hooking the + on the dwell to the test port and the - to ground. Is this correct?

This car also has a black 2 prong connector near the firewall. The connectors are female and much smaller than the blue plug at the PS. What is this black plug used for?

If this procedure is outlined in the Bentley manual let me know. I need to buy it anyway. It was not available when I owned my last Volvo.

Thanks in advance.

Scott