Zed Head

I think that the "evaporative system" contains the vent to the gas tank. You may have plugged that vent which might cause fuel pressure or flow problems. Just a thought.

I was in the salvage yard the other day and found an in-line Schrader valve on the fuel lines of an Isuzu Rodeo. I've looked around on the internet for something similar but could never find anything. The Schrader valve is common on today's fuel injected cars, as a port for a fuel pressure gauge connection, but the old Z cars don't come with them. All of the newer cars I looked at have them installed on the fuel rail so not easy to transplant. I haven't installed it yet but it fits 5/16" hose like the stock 280Z lines so should be easy to splice in. It will be convenient for fuel pressure checks or adjusting, and for relieving pressure if I need to remove any fuel system components. I've attached a picture of what I ended up with. On the Rodeo there is more hard line after the cut but also several fixtures and bends that I didn't want. If someone knows of a similar in-line valve on a different model car, I'd be interested to know of it. Putting this out there for those that might want to add something convenient to their car for no significant reason.

How long have you been waiting? Hours, days or weeks?

The drilled cams have small, but easily visible, holes on the base circle of each cam lobe to let the oil out. If your cam doesn't have the holes, then it's a spray-bar cam.

Apparently, the rotors are different, starting with the 260Z, which you apparently already know. But if you have 280Z rotors on your 240Z, you must also have the 280Z front struts and hub assembly, I believe. Maybe you should check those dimensions. That's all I know. Good luck.

They look like aftermarket rotors. What is the distance, compared between the two, from the bearing seat to the rotor face? And the dust seal seat. That will determine if the rotor is centered in the caliper, assuming the bearing diameters and other critical dimensions are the same.

How long are they? And how much space do they have to fill? The space to fill should be the same on all 280Zs with the same shocks. The shocks determine the fully extended length between the perches.The only other variable is spring length. If some people need a compressor and some don't it could be because they're using different shocks. Maybe aftermarket shocks are not all the same.

Here is a thread from the recent past, with a similar problem to yours - too much fuel. http://www.classiczcars.com/forums/showthread.php?42574-MPG-timing-fuel-and&highlight=mileage

This one? - http://www.classiczcars.com/forums/showthread.php?34192-280ZX-Distributor-Advance-Curve-Reference&highlight=Distributor

Can't help on the Eibach spring fit, mine are stock. But the dimensions you're working with would help, since the distance from spring perch to spring perch should be the same for any 280Z using the KYB 361002 in the front struts. I have the KYB 361002s on the front of my 280Z and could measure the distance from perch to perch with the front end off the ground, as could anyone, for comparison. With that measurement (maybe it's in the FSM?, I haven't looked), anyone with a new spring could measure its length and determine if they'll need a compressor or not before they even start. Do you know the length of the Eibach spring? Maybe they've been cut in the past.

You could put it in an oven at about 300 F. or hotter. The coefficient of thermal expansion is higher for aluminum than steel, that should open the gap. Let it soak to get full growth of the piston and gap. Oven mitts should be okay to handle it. Never done it myself, but that's what I would do. If you want to save the piston and sacrifice the rings, you could try taking a small center punch and break the rings out in pieces, on the hot piston. One more WAG - Naval Jelly might reduce the oxidation that's holding the ring in the groove. Oxidation, if that's what happened in your case, tends to "grow" the parts it's working on. Get rid of the oxidation, you might get rid of the sticking.

You have problems. 80 lbs is high. I think that the pressure relief valve in the block behind the oil filter is supposed to go at ~60 lbs. The spec. for oil pressure in the FSM is 50 - 57 psi at 2,000 RPM. If you unscrew the oil filler cap with the engine running does the engine run really bad or die? That would be one clue that your crankcase is sealed correctly, with no vacuum leaks. Since you're trying to run a functioning PCV system, that's what you want.

Page BE-42 has a pretty good clue (hint - already mentioned once) about the oil pressure and temperature gauges getting weird at the same time. Get a separate pressure gauge or thermometer and verify that what the dash gauge reads is true. Does your PCV system still function? If not, have you vented the crankcase? You need one or the other, blowby gases need a place to go. Most blowby blows by the rings. Blowby is the gas from combustion and it contains moisture. Those gases need to get out of the crankcase.

Have you checked the transverse link (LCA) bushings? Inside and outside, and the spindle pin and nuts? Maybe the transverse link, hub assembly and wheel are moving as a whole unit. Or the hub and wheel are rocking around on the end of the transverse link.

You might need to bleed the system a little better or adjust the pedal linkage to get more travel in the master cylinder. Were both cylinders changed or just the slave cylinder?

So what kind of help are you looking for? You're not answering the questions that will get you the help. The more details the better.

How far along are you? You didn't say which ignition system you'll be using. If you're using the 280Z ignition module and distributor then you'll need to either keep those wires or rewire. Or use a GM HEI module or MSD or similar if you're not keeping the Nissan ignition system. If you really are a total wiring noob, you should probably keep the stock ignition system if it's still in the car. What do you have? Which distributor and which ignition module? Don't tear too many wires out, at least one of them is needed to drive your tachometer even if you go with an aftermarket ignition system.

There are good diagrams in the FSMs if you want to compare the pinouts of the ECUs. EFEC section - http://www.xenons130.com/reference.html

You unplugged the water temperature sensor that the ECU reads, the one with the same connector as a fuel injector. The water temperature gauge sender (sender is just another word used, the FSM calls it a thermal transmitter) that connects to the temperature gauge only has one wire connected it. The FSM also says that if the temperature and oil pressure gauge act up at the same time, it might be the voltage regulator (the one internal to the oil pressure gauge). How is your oil pressure gauge doing?

The 280Z EFI system fires once per revolution according to the FSM. Edit - Deleted my short story, since it was barely relevant.

I learned some new stuff. I've seen recommendations of getting a new mount to stop the "clunk" but don't recall seeing the same for the strap. Mine was so loose when I got my car that I assumed it was there for extreme movement or failure. I've never seen the Scarab mount either, though I have seen an L-shaped bracket designed to do the same, but with no credit given to Scarab (I assume that they never saw the Scarab mount either and came up with the L on their own). chacha, there are some good pictures in the 1972 FSM, Rear Axle and Rear Suspension section, showing the differential from the bottom, sitting on the mount and cross member. If yours was misaligned, the front of your diff would not be visible in the same way it is in the pictures. 1970 might be different from 1972 though, since they moved the diff at some point for NVH purposes (as I understand things). If you have a 1970 FSM it might have similar pictures or diagrams.

There are many hoses to be concerned about on the EFI Z engines... The AAR should only be active for about 5 minutes right after you start the engine. It has a heater inside that gets 12 volts when the engine is running, so it closes pretty quickly, if everything is working right. It might be possible that your temperature sender is internally shorted. Did you try unplugging it to see if the gauge drops? Made a mistake in my earlier post, I was thinking about 5thhoresman's thread. Still better off with a flow-through rail and FPR system.

I don't know the 240Zs but it seems to me that if you have the original R180 differential and all of the parts are installed correctly, the strap should drop right into place. Are you removing one of the big bolts, positioning the strap, then reinserting the collar and bolt? Maybe a 240Z person knows but is it possible the mustache bar and diff mount are on backward and the diff is in the wrong place, moved back? The strap actually has quite a bit of play in it when installed, it's more of an insurance piece to stop excess stretching of the rubber diff mount, or control diff movement when the rubber mount fails. You could drive the car without it, but I would be more concerned with why it doesn't fit. It should be easy.

It should be tank>filter>rail>FPR IN>FPR OUT>return line>tank. The FPR is at the end of the system that you want pressurized. Fuel will flow continuously through the lines, rail, and FPR. You have what's called a dead-head system now which is not desirable, especially considering the fuel heating/poor starting discussion in your thread. The only fuel flowing through your rail with your current setup is what goes through the injectors. The vacuum line (small one) from the throttle body is probably ported vacuum and is meant to go to the vacuum can on the distributor. The vacuum line to the FPR (another small one) should come directly from the main body of the intake manifold. The brake booster has its own large vacuum hose. The "bypass plate", if you mean the water line that goes under the AAR, is designed to keep the AAR at engine temperature so that it doesn't reopen prematurely. Best to leave that there is you're keeping the AAR. You probably shorted your temperature sensor wire to ground somewhere. I believe that that is the test for gauge operation. Check the wire that runs to the sensor.

Download the FSM and look in the Engine Electrical section - Charging Circuit. It will tell you all about your external regulator, where it's located and how to test it. It's a small metal box in the engine bay.