Fuel Injection
Posts about fuel injection systems and related topics.
748 topics in this forum
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It's been awhile since I've done anything with the Z due to some bad stuff going on with a family member, but to refresh, I have a 75 280, 79 ZX dizzy with E12-80 module vacuum advance disconnected, Crane coil no ballast, AFM calibrated per Atlantic Z, fuel pressure 36-38 at idle w/o vacuum 32 with vacuum, all new fuel lines and clamps, timing at 15°, new CSV, new CSV, thermotine checked out OK so did the TPS(by the Bible). It starts and runs well, but stumbles at about 5800(timing I'm thinking), problem is it runs rich as hell gets about 10mpg(50 miles on 1/3 tank), plugs are sooty black and black soot at the exhaust. I've adjusted the AFM as much as 12 teeth to lean si…
Last reply by superlen, -
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- 8 replies
- 2.3k views
I'm planning on adding a Crane Hi-6S Inductive ignition box to my 1976 Datsun 280z. It has the twin pickup coil Federal Model dizzy. I've chosen the Crane inductive box for specific reasons and have been well pleased with the HI-6 CD version on other cars. Question is about install. Where specifically does the ECU get the injector Timing signal from? Is it from the negative terminal on the coil or from the Magnetic trigger in the dizzy? Has any one done an install of the Crane H-6S ( Multi-Spark inductive ignition ) on an FI 280Z and have any installation tips? TIA.
Last reply by Zed Head, -
- 2 replies
- 1.2k views
Does the factory ECU or Transistorized Ignition box on a 1976 280Z have a built in Rev Limiter?
Last reply by Chickenman, -
So my #4 injector is leaking into the engine of my 77 280. Yesterday I removed all the plugs just to look at them and discovered #4 spark plug wet with fuel. Smelled only of fuel, not oil. I have a replacement injector on its way. Now I'm trying to figure a way to fire the injectors with the whole rail removed from the intake. Want to see spray pattern. In theory I should be able to "energize" the injectors by manipulating the AFM flap and the injectors should spray fuel correct? Or is that only through the start circuit? In other words what would be the best way to energize the injectors to spray for me so I can observe flow.
Last reply by Captain Obvious, -
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- 6 replies
- 1.4k views
I had never seen a JDM L20 ecu before and was surprised to see this little adjustment screw on the side of it. I asked my wife what the kanji meant and she translated it to say "be careful with idle adjustment" I think something got lost in translation there somewhere because you can adjust the idle in the engine compartment. Perhaps its idle mixture? Instead of being on the afm they moved it to the ecu?
Last reply by FastWoman, -
- 15 replies
- 3.7k views
I have a 1977 280z with running issues. What's wrong is that when I start the car, it cranks over fine and will start fine but after the initial start it will immediately bog down and either die or run on like 3-4 cylinders :sick: It helps tons when I push the AFM in about 25% of the way, but If I let it go on its own the car sputters and bogs down again or dies. With the AFM pushed on full (the top cover is off) I can slowly push the car up to a fairly high rpm, 5000 or so, but I can't seem to do quick revs or the car will backfire even with it in all the way. Here are some of the things I've replaced: -New cap and plug wires (with relatively new plugs; they're NGK, d…
Last reply by siteunseen, -
- 1 follower
- 22 replies
- 3.1k views
Talked about in the past I know but, does anyone know if there are replacement parts for the BCDD? I believe my BCDD has a vacuum leak and am thinking about removing and blocking it off. But I'm not sure what to do about the solenoid. Here's the reason. When I unplug it the idle changes (lowers) and is not as smooth. And when I rev the engine the idle is slow to return to 800. This is while the solenoid is unplugged. My other concern is emissions. It is hard to pass emissions testing as it is in California. What will it do if its removed? I'm not sure. I don't want to purchase a used one because it could have the same problems mine has and if it doesn't when will it? Th…
Last reply by EuroDat, -
1976 EFI Overhaul 1 2 3
by sscanf- 33 replies
- 6.6k views
My apologies if this is a duplicate, the system seems to have just swallowed my carefully crafted posting (telling me I wasn't logged in). Here goes again. I just bought a 1976 280Z as a project car. The body is in good shape but its been partially dismantled. The previous owner took it apart to move some performance parts to his new Z. So it came with the EFI intake/throttle off the car (along with a bag of misc stuff). Exhaust is missing (I have MOTORSPORT TBC Coated 6-1 Header, and MSA premium exhause on order from the Z store). Bumpers are off. Interior taken apart. Drum brakes need work (in-progress - Front disks/calipers look great though). Previous owner …
Last reply by zclocks, -
- 4 replies
- 1.8k views
The winter fuel formula in California is causing vapor lock. This only happens when the winter grade comes out in California. What would anyone recommend as an additive to decrease the volatility.
Last reply by Kurbycar32, -
- 22 replies
- 2k views
Hi all, I was driving home in my '78 280, and I smelled the strong scent of raw gas at a light. I drove a few blocks home and parked the car, and I sniffed the hood vents -- raw gas. I popped the hood and looked around. I could find no leaks anywhere, visually. However, I could smell raw gas fumes in the column of hot air rising up around the front of the engine. The strongest smell was just next to the oil filler cap over the #1 injector (forward extend of the intake manifold, just above the forward tip of the heat shield between intake and exhaust. Some of the intake manifold webbing looked slightly "wet," but it appeared to be oil seepage from the valve cover…
Last reply by FastWoman, -
- 23 replies
- 12.9k views
Hi all, I notice when I let off of the gas that the engine RPMs plummet as the throttle slams shut. It's not a serious problem, but it's still a bit inelegant and ill mannered. I realize the job of the dashpot is to ease the slamming shut and possibly prevent the momentary dip in RPM below the normal idle set point. I remember when I was much younger and owned an 8 year old '75 Z. I refurbed and adjusted the dashpot and apparently kept it. However, I can't remember whether it really did anything or whether it was somewhat of a "rhubarb" (useless part) that I never bothered to remove and toss in the trash. So... Question to all you old-timers who remember these machin…
Last reply by Jorgesan, -
So in the process of converting to a custom fuel rail and changing out injectors, I was changing my fuel filter. When I got the filter loose it was rattling around and I am thinking crap, this might be the culprit of some of the fuel issues that I have been having for fricken forever. So I cut it open only to find out a small Chump-Azz filter that had come loose from the fitting. I believe that this was a Fram, but I am not certain. What pisses me off is that I don't go cheap on this kind of stuff - it is worth it to spend the $$ on good filters. Every one of you is familiar with the Z's fist size filter and you might think that surely it is stuffed full of pleated …
Last reply by FastWoman,
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