Fuel Injection
Posts about fuel injection systems and related topics.
748 topics in this forum
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- 9 replies
- 1.7k views
check valve between gas tank and emissions, does anyone know where to find one, thanks James, zdonka@yahoo.com
Last reply by zdonka, -
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- 12 replies
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Anyone got a recommendation for a good replacement PCV hose? (The one that runs from the front of the block under the intake manifold to the PCV valve.) Does anyone make this in silicone?
Last reply by Captain Obvious, -
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Sorry about the pic rotating 90 degrees CC Hello, I attached a picture of 4 sensors just below the thermostat housing of a 75 280z. 1) please correct me if I'm wrong but the one I labeled with the gold tape is the thermotime. The one I labeled with the green tape is the water temp sensor? 2) What sensor is the white tape on? 3) What sensor us the yellow tape on? Thank you, Robert
Last reply by rsperegrin1, -
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Hello, Noticed the harness to the TV SW disconnected when I bought the car, not running, 2 weeks ago. Started following the SM section EF "Engine will not start." I received no continuity between 2 & 18 (idle) and 3 & 18 (full switch). The harness to SW connection is not tight and both male and female connectors are mildly corroded. 1) I don't understand what the SM means when it says to "Check the circuit indicated by large solid lines in Fig XX." What do you check? 2) Do I replace the harness to get a new female connector? If so where do I get one? 3) Do I replace the TV SW? If so where do I get one? Thanks Robert
Last reply by rsperegrin1, -
Fuel pressure 1 2
by bhermes- 14 replies
- 2.1k views
A quick update. I have been having issues with my 76 280z leaving me stranded on the road about once a week. I suspected that I may have rust in my gas tank causing the issue. Initially confirmed by seeing brown specs in my fuel filter and confirmed after dropping my tank. I cleaned and re-coated my tank with red-Kote and re-installed. I replaced the fuel filter but did not replace my fuel pump. It was recently replaced and thought I may be able to save it. I hooked up a gauge after the filter and reading about 28psi pressure at idle and pretty consistent when I rev the engine. Also checked in gear but not yet during actual driving. I know there are a few posts bu…
Last reply by bhermes, -
- 11 replies
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Hey guys, I am working on a side hobby of rebuilding old fuel injection harnesses and nearly have one done, but was wondering what are the differences (besides how some have spliced the Thermotime Switch and Cold Start Valve together, have a 2/75 harness that butt connectored them, and an unknown that I have about done that tied them in at the Cold Start connectors) between year models are?
Last reply by pakmule87, -
- 17 replies
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After absorbing all of the ideas on where the heat soak problem originates, I decided to try the most direct solution I could fabricate and blow air directly on to the injector bodies. I have a ZX fuel system blower fan and ductwork from a ZX motor I had bought in the past but didn't want to use the bulky ductwork or the thermal switch (which doesn't seem to be effective on the ZX's anyway). So I bought a bathroom fan timer from Home Depot to control the fan (one hour range), and went to the wrecking yard and scavenged two 18" pieces of pre-heat tubing from a couple of 80s-90s Chevy S10 exhaust systems ($3). Taped the two pieces of tubing together, cut 6 holes in it ov…
Last reply by Zed Head, -
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1976 280Z I removed my tank and had it cleaned. Before reinstalling it, I ran a line into a clean can of gas, and to the fuel pump. The pump is pumping, And the car fires on ether, but will not stay running. How can I test to see if the fuel is getting to the fuel injectors? Thanks
Last reply by FastWoman, -
- 20 replies
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New on fuel system: - Fuel Hoses - Vapor Hoses - Pressure Regulator - Fuel Pump - Clean tank - Rebuilt injectors Vacuum is 19. When driving the car, the fuel pressure will increase to 36 psi at full throttle. It is 28 psi when idling and sounds like it's running lean. Pinching the return fuel hose to the tank increases the fuel pressure to 52 psi. Removing the vacuum hose to the Pressure Regulator ups the pressure to 36 psi. Also ran the car out of a gallon gas tank and still 28 psi idle. Factory Service Manual says it should be 36 psi. Any ideas on getting it to 36 psi? Thanks.
Last reply by Captain Obvious, -
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Can anyone tell me where I can find info regarding the altitude switch in the California model 280z? Nissan shows it in section EC of the FSM but with no info. I found something in section EF with very little info. Iv'e gathered it is there to lower the amount of fuel injected to decrease wear of the emission components. But only by 6%, really? Does this really affect emissions that much? Does it really have that much of an effect on our cars equipped with it? Thanks
Last reply by Captain Obvious, -
- 0 replies
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Don't know if this is old news or not, but I've turned up a mistake in the pre-78 service manuals pertaining to the resistance readings from the air and water temperature sensors (Pages EF-52+53 for 1976 and Pages EF-53+54 for 1977). Similar mistakes are in the FI "Bible" as well. Apparently there was some difficulty translating from degreesC to degreesF. Add a language translation to that, as well as a positive to negative conversion complication, and you've got issues. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ To start, here's the 78 air temp sensor chart as a reference. The math works out as do the thermister resistances: ~~~~~~~~~~~~~~~~~~~…
Last reply by Captain Obvious, -
- 16 replies
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Sometimes when I come to a stop, my idle hangs up and will not return to the correct RPM. Just started like two weeks ago. I know it's got nothing to do with the linkage or the dashpot, because I removed both of them and it was still sticky. I also know that it's not sticky goop inside the throttle body. It's clean. It's not sticky all the time, but when it gets that way, I can feel that the throttle shaft is a little more difficult to turn than "normal". Due to the fact that this is a recent development (now that it has gotten colder), my first thought was that maybe my throttle body was icing up. But heres the thing... I can shut the engine off while the throttle is stu…
Last reply by FastWoman,
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