Manifold Pressure
05-30-2011, 05:40 PM
#1
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Join Date: Feb 2010
Posts: 23
Fuel Injection
So I have tried replacing pretty much everything but the damn engine in my 280zx turbo. I am getting no were and need some help. I bought fuel injectors a while back from ebay and this is the description, http://cgi.ebay.com/ebaymotors/81-82...Q5fAccessories. I am wondering if there is a difference in 280z and 280zx fuel injectors? My other thought was it was the AFM which i have replaced three times now thinking that that was the problem but every time i put the new one in there it does the same thing. I have to manually open the AFM with my hand to make the engine run. I have to keep it almost all the way open to just keep the engine at an idle and if i release the AFM at all it will just die. I had the car running and drove once before replacing the fuel injectors and have not had it running at all sense. NEED HELP!!!!
05-30-2011, 05:57 PM
#2
Intrawebz Wizard
Join Date: Feb 2009
Location: Vernal, UT
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The 280Z never had turbo. The only difference between the 280Z and 280ZX are the larger turbo injectors. Other wise the N/a Used the same.
Have you already checked your CHT, TPS, O2, Fuel pressure? If you havent check them all first to make sure their working.
Have you already checked your CHT, TPS, O2, Fuel pressure? If you havent check them all first to make sure their working.
05-30-2011, 06:07 PM
#3
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So those feul injectors I bought then were not the right ones? That is the only thing that makes sense to me. If they are the wrong ones would it then create the engine to not run because it would not be getting the rite amount of fuel? What is the CHT by the way?
05-30-2011, 06:10 PM
#4
05-30-2011, 06:46 PM
#7
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I have not checked the O2 sensor but all of the other things are working corectly, sorry for the lack of detail this is my first car restoration. We thought it may have been the turbo sense it was not working corectly but then just replaced it and that didnt solve anything. I have put a new feul pump, egr, afm, spark plugs, feul injectors, feul pressure regulator, and turbo. I also checked the ecu and that was working fine according to the hanyes manuel.
06-09-2011, 04:56 PM
#9
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Location: Orlando, FL
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Both NA and TURBO cars have an AFM, just different types. From memory NA injectors are 180cc and the Turbo are 260cc I believe or 160 and 280, I forget. Also 280z and 280zx NA cars had the same size injector I believe.
EDIT: I would clean every single ground and connection to every electrical terminal. Also unplug the ECU and check that connection too. You will be amazed at what the smallest connection will hose up.
Also even if you had the wrong injectors initially, the motor should still run for a bit until you fowl the plugs. Which how are they? If their not black you have other issues.
EDIT: I would clean every single ground and connection to every electrical terminal. Also unplug the ECU and check that connection too. You will be amazed at what the smallest connection will hose up.
Also even if you had the wrong injectors initially, the motor should still run for a bit until you fowl the plugs. Which how are they? If their not black you have other issues.
Last edited by JSM; 06-09-2011 at 05:03 PM.
06-11-2011, 04:48 PM
#10
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Manifold Pressure
I am looking to find out what the manifold pressure is supposed to be when at idol. Currtently it is running at 15in Hg. And what pressure should you see at idol for the tube that runs from the back of the afm into the front of the turbo. I am getting no pressure in there so the afm wont open by its self. I have said before that the car only runs when you open the afm all the way and that is at idol. I have went through the manual and checked all the tests and it tells me that everything is good but it wont run unless i open the afm all the way. 
06-11-2011, 05:04 PM
#11
It's *IDLE* not American IDOL 
The vacuum / pressure in the manifold behind the TB is the only commonly measured pressure. ~15-20 hg is normal.
I'm merging this thread w/ your previous thread since you are still talking about the same problem.
The vacuum / pressure in the manifold behind the TB is the only commonly measured pressure. ~15-20 hg is normal.
I'm merging this thread w/ your previous thread since you are still talking about the same problem.
06-11-2011, 05:14 PM
#12
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I have put three different afms in an the company i bought them from tells me that it is the afm for the turbo but i dont understand why im having so much trouble with it then. Does anyone have an afm that they know is for a turbo that is laying aroound or not beig used.
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