A&Q about 350Z
Q:
That simplifies the procedure. Here it is. This is for NON-Lambda systems.
0. Ideally you should pull the injectors and run the fuel pump. While the pump is running adjust the air flow plate with the 3mm Allen wrench (clockwise/rich) until the injector starts to leak. Back off until it stops. This sets you to the very rich side of your adjustment scale without having the injectors leak on you. This step can be skipped if you're very sure you are on the rich side of the adjustment range. Reinstall the injectors. Put everything back to normal.
1. Warm up the engine until the fan has run twice.
2. Begin adjusting the airplate a 1/16th of a turn counterclockwise at a time. This is slowly leaning out the mixture. At some point (and it may be a while) the idle will start to drop. If not sure blip the throttle a small bit to restablish an idle point. When you belive you've seen the idle drop then adjust in the opposite direction to richen the mixture. The idel should now rise. Repeat the adjustment to verify that youare at the "Lean Idle Drop" (offical phrase). Set to just a bit richer than the drop point. That will have you set about as accurately as you can get without acutally using a tail pipe sniffer to verify it.
3. Remove the friggin' Allen wrench. It won't hurt anything but it'll reduce your rev range when the wrench hits the hood and won't rise anymore (Don't ask how I know this.)
4. There is no step 4.
The O2 sensor on a Lamda system will compensate for any changes you make with the airflow plate which is why it should be disconnected on a Lambda system. The O2 sensor changes the duty cycle of the frequency valve to adjust fuel pressure to the injectors and therefore the "richness" of the mixture.
A bad O2 sensor will throw off the mixture severely. Disconnecting the O2 sensor will only return your CIS to exactly what it was when Bosch first designed it. Before emmisions and gas mileage was a huge concern. Many disconnect it so it doesn't mess with their settings. To adust the airflow plate rich or lean affects the entire airflow/rev range. So a" richer" setting here means richer thruout the powerband. Ditto with lean settings.
Anytime you change system pressure thru a new pump install, filter change, injectors, fuel distributor etc. the mixture adjustment should be repeated.
taken from...
A:
Not really correct, and a very inaccurate way of adjusting a UK CIS system.
A:
sounds interesting to test as mine is running rich but how the hell do u find 1/16th of a turn ???