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All injectors on the right bank are not firing, has new harness and injectors and hight pressuer oil pump.

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  • dale0268 Aug 14, 2008

    I have a 95 E-350 with all the injectors on the right bank are dead. I did an injector buzz test and all passed but with these codes. P1294, P1293 and P1276. Help!!! ??

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Follow injector wires and check where the injector grounds are connected to the engine.. loose or not connected ground wires can cause this problem.

Posted on Aug 03, 2008

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Hi I have a 2004 mustang gt and we change the fuel pump and fuel filter and then we check the injectors with a tester and bank 1234 on the passenger side is out and 5678 on the left side is on and ain't no...


Sounds like the power splice to bank one is lost. By injection tester, do you mean a noid light?

Do you understand how the fuel injection circuit works? When the ignition key is in the on position, all of the injectors will have constant battery voltage applied to them. Bank 2 (#'s 5,6,7,8) is good- they are all pulsing. The same power wire is spliced to all 8 injectors. The other wire at each injector is the ground wire, and each ground wire goes separately into the engine computer to be internally grounded for a split second. That is the pulse of the injector, and is when it sprays fuel into the cylinder.

So think about it. Your 5,6,7,8 is working right, but 1,2,3,4 are not pulsing. Not likely 1234, all 4 separate ground wires, just went bad like that. More likely that 1234 not getting voltage to them through that common hot wire. You can check it real fast: check for voltage on any injector connector on bank 1, with the key in ON. The inj. connector only has two wires, a power and a ground wire. One of them should be hot in on. If no power on bank 1 injectors, trace it back to the engine harness. Somewhere, the power wire will splice off between bank 1 and bank 2.

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My 89 Grand Prix with a 2.8 just dies going down


Sounds like a bad fuel injector. Back in the day we would let them runout in the parking lot and when they stalled we would rip off the intake plenum as fast as possible and ohm check the injectors. They should be around 13 ohms. If they are significantly less, say 3 ohms, than those injectors are bad. This system bank fires the injectors. Meaning that all three injectors on the front back fire at the same time and all three of the injectors on the back bank fire at the same time. If one injector hoes bad it will shut down the whole bank which will stall the engine.

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1 Answer

Engine only firing on left bank rtf. Side no. Fire will start and idle


Check for spark on the side not firing. If there is spark, the injectors on the right side may have a problem in the wiring to them. Older multi port injection systems used a "bank fired" approach: all the injector grounds on one bank splice together before they go into the computer to be pulsed.
All of the injectors have a steady voltage applied to them when the key is on. The same color wire to all injectors is the power wire, it is a fused circuit, the fuse is in the power distribution box, and is hot in run or start. When the computer internally grounds the injectors, pulse occurs and fuel is sprayed out. Check if the right side has power to the injectors with key on, use a voltmeter or test light. To test an injector circuit, purchase a cheap "noid light" from a parts store. You plug it into an injector connector, then crank the engine over. If the noid light is blinking, the power and ground circuit is good for that injector.

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1 Answer

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The injectors get power on the same pink wire, so they should all have power. Each injector is grounded by the engine computer on a different circuit. ( on most engines )
If the spark plugs are firing on each cylinder, but the injectors are not getting a ground signal, it would almost have to be a wiring or computer problem. You should be able to pin test the harness at the computer to verify if you don't have ground pulse at the injectors.

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I have a 2004 jeep liberty, when the vehicle is at a stand still the oil light comes on, as I start to drive and continue to drive the light goes out. Comes on again at times when standing still,...


1st thing to try is to replace the oil sinding unit, if the problem percets then have someone install a manuel oil pressuer gauge to check the oil pressuer at hot idle if oil pressuer is less then 10 psi at hot idle then replace the oil pump.

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I have a 91 vette i replaced the injectors because it seamed like i was pullinga trailer after the new injectors were installed it wont start just turns over, i had replaced the pump prior, it will start...


The fuel pressure need to be 48psi to 55 psi. The fuel pressure has to be correct inorder for it to start you said you have fule pressure then we need to assume the pressure is good first check for power at the injector with key on engine off If you dont have power check the engine fuse box for a open fuel injector fuse replace if there is a open fuse , then check the ground signal that comes from the ECM this should be a on off ground signal Now you check this on left and right bank since your vehicle injector is bank fired . You will also need to check the injector relays there should be 2 one for left and one for right more than likely you have the ijector harness disconnected so follow the wire to its junction and make sure its realy connected not just looks connected

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1 Answer

I have a 1992 acura legend it's been sitting up for about three years replaced the fuel pump, fuel filter, spark plugs, injector resistor, ran compression check on all cyl. all above 150 psi. swapped ign....


Put a meter on the firing and non firing side on the injectors and see if the reading is the same. Sometimes a whole bank of injectors loose the pulse to inject. If this is what is going on you need to check all the fuses, and look for wiring harness grounds on the engine near the injectors. A bad connection, or a bad fuse can shut down one side of the engine. It is also possible the engine computer has lost a driver, and is bad, this also can shut down a bank of injectors. Most of the time problems like this are caused by bad connections. If a quick check of these mentioned items doesn't help then get a good service manual with a wiring schematic in it and start checking out the wires to see if there is a break in the wires.

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1 Answer

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check the injectors on that bank for pulses.. a regular 12v text light will do it should flash when cranking... its very possible that the crank sensor or camshaft sensor on the replacement engine is bad and giving you all the problems you have now.. are you using the original injectors? if you have injector pulses then check the coil for pulses the same way.. btw make sure you have 12v to them even before cranking engine could be a bad asd relay..wet plugs on one bank would also indicate a possible leaking injector and basicly draing the fuel starving the oposite bank for fuel.. to verify that the rail must be lifted by removing all 4 bolts make sure the clips hold the injectors firmly and turn the key to run but dont crank it then look for fuel leakin from bottom of injector(s) any drips is a bad injector..

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