Zed Head

One major difficulty is removing the colored connectors from the white plastic framework by the fusebox. It looks like Nissan meant for them to go in but never come out. I tried when I had a 78 parts car but couldn't come up with a method. I think I've seen one out on the internet somewhere though.

All four hoses to the can removes the "positive" pressure differential that causes the crankcase gases to be purged. Air could flow directly through the can to the PCV valve without going through the crankcase. The crankcase would be dead air. The ports are separated and placed to cause the "positive" part of PCV. The PCV system has some fine details. Looking at the diagram you can see that a stuck open PCV valve can also cause a leak past the throttle body. Could cause a high idle problem. I'll have to remember that one. I've wondered also why there are so many different PCV valves, all with the same threads and from factor. There must be some fine tuning of the springs inside. Your engine will probably run fine. Just might gunk up the oil sooner than normal. We could probably have a whole thread on PCV systems.

You'll have a sealed system but little air flow. No fresh air supply. No purging of the crankcase. The PCV system is more sophisticated than it looks, it has fresh air flow through the crankcase, carrying moisture vapor and other combustion byproducts out. Don't want to muddy up your thread, just hate to see a lot of work going to something that won't do what you thought it was going to do. I would just run a section of hose from your new vent position to the same spot the old one was. Put the can in between if you still feel the need. Might keep the intake cleaner. I'll stop now.

I think that you would get new lash pads with a new cam grind and that would get the hydraulic pivots (they're not really "lifters") back to the right range. Many people swap the hydraulic pivots to solid, with Timersert inserts (to get the proper thread in the hole). The hydraulics can fail and I don't think they're available anymore. A P79 head would give you 8.8 CR with those pistons, or an N42 or N47, about 9.8.

You'll suck unmetered air (doesn't go through the AFM) in to the intake manifold. Through the catch can, then the valve cover, crankcase, PCV hose, PCV valve. Big no-no if you plan to keep the EFI. Plus you've lost the baffle that stopped oil spray. At lower RPM you'll run lean (may not even run), at full throttle you'll blow oil vapor in to your catch can. Looks great, just not as functional. A well-tuned 280Z won't run with the filler cap removed because of the air leak. Carry on though. You'll come up with something that works, I'm sure.

You should sic him on the guy with the yellow shed car. Offer him cash and a lead on another car. Maybe he can work his verbal magic and break it free.

If you don't block the PCV under the intake manifold you'll have suction through the catch can back to the intake manifold, a vacuum leak. If you seal the catch can, it will be a dead zone with no real function. Not picking, just exercising my technical brain. The Emissions chapter shows the various flow paths from the crankcase of the PCV system. Actually fun to study. You could just bend a hose along the edge of the intake manifold and retain the factory functions, but with a cleaner look. Most people use catch-cans on race engines that produce lots of crankcase pressure, to catch oil mist before venting.

Do you have urethane front and back or the mixed rubber and urethane? Mine would loosen when I had full urethane, until the end broke off of one of the rods. Now I have rubber in the back, urethane in the front, double nuts, with the back nut a lock nut, and thread locker.

Looks like fun. FYI, the Fairlady moniker is typically reserved for the left-hand drive cars from Japan, I believe. Yours is just a 280Z. Not a big deal but this is the site for the purists, along with the rest of us. Classic. Buy some contact cleaner, like DeOxit, and some nut-buster like PB Blaster, and start spraying so it can start working.

Genius, Nobel prize level thinking. I wonder if the insurance rates are lower because of that. Although, I can eat a donut and shift at the same time. I'm sure some kids have worked out a way to text.

Smooth and sleek. You could probably fill any divots with solder (lead) if you're planning to coat it. More durable than body filler, I'd guess. It may be in the 26 pages somewhere, but are you planning for carbs or just disabling the PCV system? Just curious about why you want a catch-can instead.

What are the upgrades?

"I hearing"? So you're having an auction, with the starting bid at $13,500. Good luck.

Loosen the cap while it's sitting and see if pressure buildup is part of the problem. There have been discussions about the tank holding pressure before. Somewhat inconclusive. My 76 has zero pressure buildup. When I remove the cap, nothing happens. Could be that my check valve is toast, or they changed the valve in later years. The diagrams show a spring-actuated check valve, but there's no information about the pressure it's designed to release. It's between the vent tank and the charcoal can. Since you have a decent view of the leak area you might also jack up the passenger side of the car, creating a new low spot. If the leak is in the hose, you'll see a trail down the hose from the hole. If it's at the metal-hose interface you'll only see fuel at the seam. Use a mirror to get a better view. That's a lot of gas.

How much?

Drove by the other day and it's still there. Buried under old shed wood. There were a bunch of vehicles n the drive, a white van and many 5 gallon paint cans. Looks like a working guy who sees his dream sitting there every day when he gets home. Can't blame him if he doesn't sell. If he had a garage and some internet access he'd probably be here. Maybe we should leave him a note with "classiczcars.com" on it.

One thing to be careful of - you could decide to get new parts and "upgrade" and find that you need an adjustable FPR , and end up right back in the same spot with an FPR that doesn't hold pressure. Many of the shiny aftermarket FPR's don't hold pressure. Also, on testing injector flow, I had unbalanced injectors for a while and I'm pretty sure it contributed to a buzzy, rough running feel at high RPM. Made me decide to swap a 5 speed for my 4 speed. But now, with good injectors and a good tuneup, I often find myself in 4th gear on the freeway when I should be in 5th. Stuff to think about.

I knew that we'd end up in the same time frame. I even waited. Chas showed also his method for testing injector flow, but didn't detail it. You can short the injector circuits at the ECU connector to get full flow for a short period of time. You can see in his picture that his were unbalanced. You might try that before anything. You'll probably end up replacing all of your injectors. That's how things usually go. There's a procedure in the Engine Fuel chapter for replacing injector hose. IT's just pressed over a barb, no hose clamp. If you find that your injectors are fine, you'll probably find that the hose isn't . It will be cracked if you look at the internal portion, end-on. Little streamers of gas come out eventually.

Sounds like 2 wires aren't connected. The one from B to the battery positive terminal, and the S wire at the alternator. But they might both run through the same fusible link. Find the fusible link that's in the wire from the B terminal to the battery post. Actually it would be the white wire that connects to the starter lug, that's show Nissan got it there. If you accidentally touched the end of the white wire at the alternator to ground with the battery connected you'd blow that link. The short diagnostic method would be to measure resistance from the battery + post to the alternator B terminal. You'll probably find it's open circuit, then go from there.

Here's a link to what the injector clips look like. You can see it in your picture. They used a different style for some reason, even more difficult to remove, in the hardest spot to get to. Your right angle pick will work, or a small screwdriver. Pry the tip out, lift one side to keep it there, then pry the other side out and remove the connector. Or you can pry it out then stick a striaght pick underneath to hold it. Or get mad and just tear it off, the old plastic will shatter like glass. Replace with GM, Audi, BMW or Volvo spring-clip EV1 connectors. Mid-90's era cars used them, some still do. http://www.thezstore.com/page/TZS/PROD/11-3410 Here's a bulky style. The GM and BMW models are very streamlined. http://www.thezstore.com/page/TZS/PROD/11-3059

Is it still overheating?

Report the new pump and the 5.5 psi measurement here.

Is it still backfiring?

jalexquijano's 240Z problems 1. Engine shakes during acceleration at low RPM. Clutch is engaged, so it's not a clutch engagement problem. New differential mount had no affect. 2. Plugs foul. Smell of excess gas. Fuel pressure measured at rear carb was ~5.5 psi. (before rear carb or after rear carb? Deadheaded?). 3. Engine backfires - 4. Engine overheats - I would keep a running list of these things and post them in all of your threads. On your current request for a pressure regulator - you didn't say that you have a regulator now. If you don't have a regulator and you're seeing 5.5 psi after the carbs, then you'll need to do some plumbing work also to bypass the excess pressure as Stanley suggested. And, you didn't respond to his suggestion of an Aeromotive regulator, or a Mallory 4070LP The Mallory is set to 3-4 psi and can be adjusted over a narrow range. He made a suggestion and you just ignored it. That's why people aren't responding any more to your questions. If someone suggests something you have to at least acknowledge that you saw it. Otherwise, what's the point of responding to jalexquijano's questions. He'll just ignore the response. Good luck. http://www.jegs.com/InstallationInstructions/600/650/650-4070LP.pdf

" cylinder pressure readings, cam timing pictures, pictures of the cam lobes, all of that, " Everything that you know. The back and forth shaking could be the way the engine runs, or it could be from engaging the clutch. Which is it? I know you've been over all of this before, but it's your car so you need to keep the facts organized. You should be able to summarize all of the problems that you've had, and the suggestions that people have made.