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Mak
Novice
May 30, 2010, 9:41 AM
Post #1 of 7
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Hey, so I have a 79 datsun 280zx and i cannot get the fuel injectors to fire. I have not had much if any experience in fuel injectors. I put a test light to the plug and both sides are showing to be hot. I would assume one side is supposed to be + and one side - , but i don't really know. anybody know what's going on? Theres plenty of fuel pressure by the way. Thanks.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 30, 2010, 11:18 AM
Post #2 of 7
(1932 views)
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Re: Fuel Injectors
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They are both reading hot because it was plugged in when you tested it. Test to see if you have spark at the plugs.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Mak
Novice
May 30, 2010, 11:48 AM
Post #3 of 7
(1927 views)
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Re: Fuel Injectors
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Well, the car runs when you pour gas in the intake and it has good spark,new plugs, wires and coil. I disconnected the plugs from the injectors and both sides were hot with all the injectors disconnected. I actually shocked the hell out of myself replacing the coil yesterday, so i can verify that it has good spark. lol.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 30, 2010, 11:53 AM
Post #4 of 7
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Re: Fuel Injectors
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If your showing power at both wires when unplugged then either the wires are shorted together somewhere in the harness or a problem with the ECM itself. It's going to take some detailed troubleshooting to confirm the problem.
Having spark confirms that the distributor is supplying a reference signal for the injectors.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Mak
Novice
May 30, 2010, 2:48 PM
Post #5 of 7
(1916 views)
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Re: Fuel Injectors
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I was thinking the ECM, but i hate to spend that much. Do you know a definete way to tell what it would be before i spend the money? Thanks for the help by the way.
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Hammer Time
Ultimate Carjunky
/ Moderator
May 30, 2010, 2:51 PM
Post #6 of 7
(1914 views)
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Re: Fuel Injectors
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Like I already told you. This isn't a diagnosis your going to find on the Internet. Everything has to be troubleshooted including all the wiring and all the inputs to the ECM. There is no definitive way to condemn an ECM. The process is to eliminate everything related to it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Mak
Novice
May 30, 2010, 2:57 PM
Post #7 of 7
(1911 views)
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Re: Fuel Injectors
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looks like i'm calling some friends and buying the beer tonight. lol. Thanks for the help man. Really appreciate it.
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