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I spend the last few days cleaning the electrical connections and timing the ignition again as it was out of spec. The car runs way better but the AFR gauge still shows 11,5 at idle. I'd like to bring that down (or up depending how you look at it) to 14,7 as the car stinks of gas. The previous owner mentioned that that was the reason it didn't pass inspection (auction company didn't mention that). I tried messing with the idle air mixture screw but that didn't help. When turning clockwise a bunch the car did start to run richer but when turning anti clockwise it didn't get past 11,5 AFR. I did notice the ignition coil is a 1,5 ohm unit with a total resistance of 2 ohm with the external resistor. I believe it needs to be closer to 1 ohm total so I'll probably replace the coil with a 0,5 ohm one.

Adam Sylvester at Datsun Rescue or Jenny at Junkyard Jenny's.

Had a busy weekend working on my girlfriends car (brakes, oil, alternator, water pump and timing belts) but yesterday I had some time left to work on the Z. The car was running rich so I ordered a cheap AFR gauge to measure the air-fuel ratio of the car. I installed the gauge in the engine bay for now with the power wires just clamped to the battery as I can’t drive the car till I get my inspection done. I read some threads about the EFI Z’s running rich or running rough in general so I cleaned the contacts on all the electrical plugs and readjusted the throttle position sensor. The contacts of the AFM and the cold start valve where actually pretty corroded but cleaned up nicely. For good measure I also decided to change the spark plugs and do a compression test. O boy was I glad I did that. The spark plug in the number 1 cylinder turned out to be a different one without a manufacturer name. It was also heavily cracked and the spark plug wire wasn’t even attached! (am I glad I ordered new once). The compression was pretty consistent from what I could tell but my battery and probably also the alternator are dying, only to be caped alive by my battery charger. The engine cracks very slow with the sparkplugs in (even only one) and when dialing back the idle the engine can’t keep a consistent rpm. It even died after a while. I the end I just jumped the battery with my girlfriends car witch helped a lot. After the cleaning the car also ran much better with an AFR of 11.2 and after warming up for a bit it changed to about 13. When revving the car to about 4000rpm the AFR changed to about 15. I’m not very familiar with AFR ratios but 13 at idle (after warmup) seems pretty good to me and hopefully lets me pass inspection. But for that I still need to wait for some backorder parts from Z-Services.