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Car was tested and leak down test was accomplished. Drove 30 minutes with no pcv valve connected and no thermostat to avoid engine temperature rising got stucked in short traffic. Car still got some rough idle when getting out of traffic until temperature went back to normal. Parked the car and all plugs were burning ok. So this could be a vapor lock or percolation problem. Leak down and compression test got good results. Do you still think i need to take the head out? He did blocked the fuel return line as i have an airtex 8012S electric pump installed and says no need to have that line opened.

Jet Hot coatings in SC.

Thanks @Patcon I had not seen that before. It's on order. If heat is a problem maybe we can get a 2fer😃

Since you're in experimentation mode and you have fabricating skills, you might remove the factory mount and fab up a new mount that gives the desired angle. It wouldn't need to be super strong or made for permanence if you're only evaluating cruising speed. Keep the strap in place in case of breakage. It could be a solid mount. If the angle is perfect but the vibration is the same, then you can start looking elsewhere. The RTz mount either gives a certain angle with the GM mount, or it gives a range of angles in use with the snubber, as the diff nose moves up and down. The GM version is an actual mount, the snubber version is essentially a solid strap. p.s. have you considered mounting a camera under the car to see what the diff nose is doing while driving? Maybe something is moving. Or, looking back at your pictures of the crossmembers, why don't you just shim the crossmember mount downward with some washers. Perfect the angle, take it for a drive. then you'll know if you should go further.

I did this Z Car Depot IncCarburetor Return Spring Bracket Plate Custom 240ZStainless steel plate that mounts under the intake for attaching the carburetor return springs on Datsun 240Z. This plate bolts to the original intake and allows for 2 spring clips but offers mini...I also do not have coated headers. That may end up being an issue but I will deal with later if it is

Probably a lot more info at hybrid Z Zedhead or Grannyknot are probably more familiar with how to find it there

Been looking at RT mount info. Found this: https://www.technoversions.com/DiffMount.html If I were to go this route, the mount underneath the differential would have to be removed completely. There is also question as to whether the RT bracket and this mount would fit the car without modification. Apparently, it is likely that the bolt for the mount to the bracket will interfere with part of the handbrake linkage. Though, there is a possibility that the mount has 3 mounting holes, and if so, one could use the two outside ones instead of the middle one and solve that issue. I can find a little bit of info about people addressing this problem, but I have not found conclusive proof that unmodified cars have this issue. I'd like to get some confirmation of that. Otherwise, I feel like I am missing something.

Thanks Zed. I will add condensers and publish a new revision to the diagram shortly!

I did not. Was going to wait and see if there was going to be a problem with the heat.

Sounds like your fuel pump relay is bad. Send me a pm.

Update: My 280Z will not start. I am getting 0 PSIG on the fuel pressure gauge on the fuel oil supply line. I was able to source a replacement fuel damper and plumbed up everything. Troubleshooting per the Fuel Injection and Factory Service Manual led me to find the following: All wiring connections are as intended - I did not find any plugs or harnesses disconnected. The fuel pump is not getting power when I start the car. No voltage is present at the fuel pump across the power and ground terminals when the key is in the "On" position. No voltage is present at the wiring harness under the passenger seat at the green wire and black ground when the key is in the "On" position. The fuel pump relay clicks when I try to start the car. The fuel pump operates when I run a direct line from the positive battery terminal to the pump. All of troubleshooting checks from the "Engine won't Start" section of the Fuel Injection Bible pass and my efforts lead to quote "try a different ECU." I was able to source a second ECU on eBay, but it yields the same result. My taillights and license plate lights do not work (not getting power). Running a separate ground wire from the fuel pump negative terminal to a chassis ground does not resolve the no starting condition. Based on my findings above, I am not sure what my issue is or to diagnose why I am not getting any power to the pump. Anyone have a similar problem and can diagnose? I thought maybe it was a bad ground, but wouldn't the separate ground wire have resolved the problem? From what I understand, the main ground that the fuel pump, taillights, etc. are connected to requires removal of the gas tank to access. I was hoping to avoid this, but if it is my next step, so be it. Also, when the previous damper failed, it did drip gasoline on to the pump and terminals. This is because on 1976 280Zs, the damper is above the pump and the whole kit (damper, pump, hoses, wiring) is mounted to an L shaped bracket that is mounted with three screws to the chassis. This was changed in 1977 and 1978 models to a flat plate that mounts to the chassis but places the damper and pump side-by-side. I'm guessing this was an improvement that would have reduced the possibility of a failed damper leaking fuel onto the pump. Could that wetting of the pump terminals have ruined my ground wire or power wire to the pump? How likely is it that my remanufactured aftermarket ECU and the eBay replacement (which was started to be from a 1976 2+2 4 speed, just like mine) are both bad and presenting the same exact issue?

Did you have the headers Ceramic coated? I understand that’s not the issue at hand but will eliminate carb problems.

Sorry for the delay. The transmission is in, without to much drama. Installed my new Z Story exhaust (Street Sport Header) That went well. Thanks for the tips from @Patcon But now to the what was I thinking catagory☹️ Went to install my heat shield and it is not going to clear the new header. Should of new that from the start. So what are my options? No heat shield? If so what do you attach the return spprings to? Does anyone make a shield that will work? (running SU's) Any ideas would be welcomed. Patcon are you going to run SU's? If so do you have a plan? Thanks for the help. Stee

Somebody called datsunparts bid $2200. There's a business called datsunparts, looks Roadster focused. Might be worth more parted out. Those exhaust ports are weird. Maybe it's a "detuned" L28 for a different model. Maybe the Z's got the good stuff. https://datsunparts.com/

Found a picture on BaT. #138 shows a condenser on the back of an alternator. Bring a TrailerNo Reserve: 1972 Datsun 240Z 4-SpeedBid for the chance to own a No Reserve: 1972 Datsun 240Z 4-Speed at auction with Bring a Trailer, the home of the best vintage and classic cars online. Lot #181,834. Uploading Attachment...

I’m personally done. If his mechanic is that good there’s really no reason to post on a topic thats well over 6 years old and pretty much has not accepted any one persons advivce nor reported back on the findings from suggestions that were given.

Awesome. Thanks for the help. So it sounds like there are supposed to be four condensers: One on the distributor. One over by the coil, attached to coil (+) One on the back of the alternator, and One by the voltage regulator. Anyone else want to weigh in? Input from people who document pretty much everything? ( @CanTechZ )

Hahahaha!! I've been called worse than stickler as well. And that was just today!! 😄 I'm confident with your attention to detail, that stuff I noticed has already been addressed, or will be in the near future.

We are testing the car again tomorrow morning. I do notice some backfire when releasing the gas pedal maybe its due to the closing of the damaged pcv valve which permitted the oil flood of plugs 3 and 4. Car is not even reaching over 6000 rpms. A lot of misfire after getting out of traffic.

I suspect that JAlex's problems may be the result of poor local fuel quality combined with local high-temp conditions. Not sure that any of us are qualified to provide proper guidance on that combination. Maybe not even Nissan. It may prove difficult to find qualified tech help in Panama. That said, I hope the new mechanic proves to be up to the task and this will end with JAlex piloting Panama's best Z on his local streets and highways.

Bottom line that’s not the way the engine was designed unless he thinks you had a defective thermostat.

This new mechanic says the pcv valve is shut. We are making a test drive on monday again and see what happens. The car is also now driven with no thermostat.

Already $1800. I'm surprised it's that high considering it's been sitting and you really don't know what you've got until you take it apart. Is the compression ratio a turbo level compression ration?

You could look at the RT mount and customize the diff angle

IMHO Pull the head.