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fuel injector


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mata_oso
Anonymous Poster
mata_oso@yahoo.com

Sep 9, 2009, 1:02 PM

Post #1 of 13 (1756 views)
fuel injector Sign In

My 1991Chevrolet S10 2.8 lt, has not been running well for a while now and what i have learned is that one of the neutral wires going to one of the injectors, is not working right. Can i just ground it to the fire wall?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 9, 2009, 1:17 PM

Post #2 of 13 (1746 views)
Re: fuel injector Sign In

No, definitely not. If by "neutral", you mean the ground side, that is the way the computer actually operates the injector. Grounding it would would simply open it all the time and flood the engine.

You need to diagnose why you have no injector pulse if you really don't.



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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.



Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Sep 9, 2009, 1:25 PM

Post #3 of 13 (1740 views)
Re: fuel injector Sign In

mata; This is a TBI type? There is a metal spacer between the air filter and the TBI. It is common for the wires going to the injectors to get 'pinched' in between the spacer and the injector. The resistance value for the injectors is 1.3 ohms.
Loren
SW Washington


Guest
Anonymous Poster

Sep 9, 2009, 1:27 PM

Post #4 of 13 (1740 views)
Re: fuel injector Sign In

I guess you mean that i would have to take it in to get check, but what it does is, it will lose power on and off. i don't think its a wire that is messed up becouse when i do go throw a bumpy road it wont do it, and visa versa. it just seems to switch on and off when i drive it or it is standing still.
i have already replaced both injectors,


Guest
Anonymous Poster

Sep 9, 2009, 1:34 PM

Post #5 of 13 (1735 views)
Re: fuel injector Sign In

Thanks, i did see that the injector that was failing was pinched, so i bought the connector with the pig tal, amd replaced it but it still does the same. the problem seems to be futher down the line, but i am not sure if i can mess with the harnes. where dose that wire connect to?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 9, 2009, 1:42 PM

Post #6 of 13 (1728 views)
Re: fuel injector Sign In

What makes you think that your even looking in the right area? Do you have some reason to believe you have an injector trigger problem? You don't seem to have used a noid light to do this.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Guest
Anonymous Poster

Sep 10, 2009, 5:47 AM

Post #7 of 13 (1720 views)
Re: fuel injector Sign In

i know because the other injector works, and i can see that the other does not.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 10, 2009, 9:15 AM

Post #8 of 13 (1712 views)
Re: fuel injector Sign In

Try swapping the plugs to the other injector first and see if the problem follows. Test to make sure you have constant power to one side of each injector.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



Loren Champlain Sr
Veteran / Moderator
Loren Champlain Sr profile image

Sep 10, 2009, 10:20 AM

Post #9 of 13 (1706 views)
Re: fuel injector Sign In

Also, what was the resistance value?
Loren
SW Washington


Guest
Anonymous Poster

Sep 11, 2009, 12:31 PM

Post #10 of 13 (1695 views)
Re: fuel injector Sign In

havent had a chance get a value, but when i swap the connectors the other would start acting up and the other would work fine.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 11, 2009, 12:34 PM

Post #11 of 13 (1692 views)
Re: fuel injector Sign In

That tell you the injectors themselves are not the problem. Now test for power at one side of each injector plug with the key on.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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.



(This post was edited by Hammer Time on Sep 11, 2009, 12:35 PM)


Guest
Anonymous Poster

Sep 12, 2009, 4:13 PM

Post #12 of 13 (1679 views)
Re: fuel injector Sign In

When i tested for power on the connector with the key on, i did not get a reading. when i turn on the truck i got 14 on both sides. i keep getting the same answer that its your engiene control computer, but could it be the ground, and where is that located at? I also am having a hard time find a computer that is the same too.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 12, 2009, 4:18 PM

Post #13 of 13 (1676 views)
Re: fuel injector Sign In

I don't know where your getting that answer from. You haven't finished testing the circuit yet.

You now need to check the resistance of both injectors to see if one could have damaged the computer and then you have to test the continuity of that wire back to the computer.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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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