C4 1984 only one injector function!
Thread Starter
8th Gear
Joined: Oct 2016
Posts: 8
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C4 1984 only one injector function!
Hi guys!
Got a 84 C4 whic I have struggled with. Bought it not running, and did a lot of searching before I found a faulty gaspump. Thats new, and the car starts.
But only the passangerside injector works. I bought a noid-light set, and the drivesrside injector is not turning the light on the noid. No pulse. Any tips on where to start searching?
Thanks
Got a 84 C4 whic I have struggled with. Bought it not running, and did a lot of searching before I found a faulty gaspump. Thats new, and the car starts.
But only the passangerside injector works. I bought a noid-light set, and the drivesrside injector is not turning the light on the noid. No pulse. Any tips on where to start searching?
Thanks
Tech Contributor
Joined: Jun 2004
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
Hi guys!
Got a 84 C4 whic I have struggled with. Bought it not running, and did a lot of searching before I found a faulty gaspump. Thats new, and the car starts.
But only the passangerside injector works. I bought a noid-light set, and the drivesrside injector is not turning the light on the noid. No pulse. Any tips on where to start searching?
Thanks
Got a 84 C4 whic I have struggled with. Bought it not running, and did a lot of searching before I found a faulty gaspump. Thats new, and the car starts.
But only the passangerside injector works. I bought a noid-light set, and the drivesrside injector is not turning the light on the noid. No pulse. Any tips on where to start searching?
Thanks
Thread Starter
8th Gear
Joined: Oct 2016
Posts: 8
Likes: 0
If so- no, I can not see there is any power coming to it. The noid is backing that thery up I guess.
If you mean something else, I am sorry- Norwegian, so might get a little lost in translation.
Race Director
Joined: Mar 2015
Posts: 15,926
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I believe you have two injector fuses one for each side if I am right easy fix replace the bad one.
Fuse #22 - INJR1, 15 A -Fuel Injectors 1,3,5,7 Ignition Coil 1,3,5,7
Fuse #18 - INJR2, 15 A - Fuel injectors 2,4,6,8 Ignition Coil 2,4,6,8
Welcome to the forum!!!!!
Fuse #22 - INJR1, 15 A -Fuel Injectors 1,3,5,7 Ignition Coil 1,3,5,7
Fuse #18 - INJR2, 15 A - Fuel injectors 2,4,6,8 Ignition Coil 2,4,6,8
Welcome to the forum!!!!!
Last edited by antfarmer2; Oct 25, 2016 at 03:44 PM.
Race Director
Joined: Mar 2015
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If you have power to one of the injector harness and you hook up a noid lite and cranking engine over and the lite doesn't flash-The computer ground driver circuit is defective.
Last edited by antfarmer2; Oct 25, 2016 at 03:53 PM.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
Did you check the fuses w/a meter? Some times just looking at them can getcha!
The noid light isn't a proper test. You should have power TO the injectors all the time, key on. ECM grounds the injectors to fire them. So, it's possible that the noid light won't light b/c no ground through the ECM....but injector has power. Test for power at the injector plug using a volt meter connected to ground. If you have power, you know your fuses are good, and the problem is on the ground/ECM side. If no power, you need to trouble shoot back to fuse panel.
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Thread Starter
8th Gear
Joined: Oct 2016
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Okey!
Thanks guys. I have been hesitant to use a voltmeter on the harness leading up to the injector, cause i thought i read somewhere that it could mess up something.
So I can just go ahead and measure if there is power to the injector then.
Should say the noid works on the other injector that is working.
Just shove the measuring sticks , yeah thats good english right there...but the pins, one red and one black. Just put them in any of the two holes of the injectorplug then? Or just one pin in there, and the other connected to something grounded?
Thanks guys. I have been hesitant to use a voltmeter on the harness leading up to the injector, cause i thought i read somewhere that it could mess up something.
So I can just go ahead and measure if there is power to the injector then.
Should say the noid works on the other injector that is working.
Just shove the measuring sticks , yeah thats good english right there...but the pins, one red and one black. Just put them in any of the two holes of the injectorplug then? Or just one pin in there, and the other connected to something grounded?
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
I think that you're doing O.K. Keep going.
Thread Starter
8th Gear
Joined: Oct 2016
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Yep!
No, put your red pin/probe into the hole of the injector plug, then touch your other to ground (any clean metal on the engine). You should see voltage on your meter...with the key on. If not, try your red pin/probe in the other hole of the injector plug.
I think that you're doing O.K. Keep going.
No, put your red pin/probe into the hole of the injector plug, then touch your other to ground (any clean metal on the engine). You should see voltage on your meter...with the key on. If not, try your red pin/probe in the other hole of the injector plug.
I think that you're doing O.K. Keep going.
Team Owner
Joined: Aug 2004
Posts: 21,543
Likes: 3,216
From: Park City Utah
