Master mechanic of 40 years and I put in a 1979 L-28 with 80k miles into ,1980 280zx, we used same rail injection and distributor as old blown head gasket L-28. Have tried to figure out why only hitting on 5 cylinders not 6.. Injector and spark timming are perfect; but just cannot get #1 cylinder kicking in-it has good compression. Am hoping it is not a burnt valve; but at a very big loss as to what it could be-hopefully something simple; maybe electrical. MAF, and sending units seem to be working properly. Thank you for looking into this as we are very stumped here!

Time to get back to basics. You SAY good compression, what are the #'s, dry and wet?

If you spritz starting fluid / faux fuel, does cylinder #1 start firing? Then it's a fuel / injector problem.

When you pull the wire off the plug do you have spark? Then it's an ignition problem.

If you put a stethoscope on the injector, can you hear it clicking?

Compression.

Fuel.

Spark.

Your #1 cylinder high tension spark plug wire in good shape? Distributor cap in good shape? Spark plug in good shape?

If all the other cylinders are running great, you can skip all the sensors. Maf, coolant, fuel pressure regulator & the ECU would all affect all your cylinders. If it's just #1, I would do these in order: I'm sure most you already have.

1. Swap plug and plug wire with #2...see if it follows those, if not, your wire and plug are fine for #1.

2. Swap the injector connector with 1 and 2. Same reason.

3. Swap the actual injector (this is more of a pain, so while they are all out inspect, clean, test, ect)

Lenny