Question about 1987 Ford Bronco II

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87 bronco 2 fuel injecter harness

On an 87 bronco 2 for the fuel injecters there is a common wire and two pulse wires,does one plse wire feed the injecters on the pass. side and the other on the drivers side ?

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Nope... they only inject fuel during the compression stroke of the engine. Thats how they were designed.

Posted on Jan 22, 2009

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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.

Nov 04, 2014 | Cars & Trucks

3 Answers

Kia diagram


Check your immobiliser system.

Aug 03, 2014 | 2000 Kia Sportage

1 Answer

Fuel injectors quit working


fuse power to rail injector must be good check fuses first.
is CEL glowing key ?
ok,no engine stated. this the 4 liter? I6? nah you said HEADS
not 2.5L I4
not 4.0 L I6
so must be V6, really
or the 2.1L diesel....>>>>
and 3 or 4 diffr. EFI systems, im not much help
why folks post engine free ,amazes me....

it takes 2 things.
fuel pressure over 30psi (generic)
and the noid lamp passing on injector.

and the knowledge that all jeeps,(cars) cut fuel (gas)
if the PCM see and errors with (crank for 5 seconds)
1: spark?
2: CMP?
3: CKP?
4: if IMMO , that too, no imm on 87, think , go lazy to look up.

If the NOID lamps fail x6 (no injection pulses)
then the ASD relay is dropping out)
87 is the really really old RENIX/Benicx injection system. on 4L
i had a 88. same car.
see alldata.com for permissive to inject.

on my old I6 4L Renix sys
the injectors are all grounded , that is correct
and the ECU drives this hot switched ! unlike most cars.
back then the ASD was called the LATCH relay.
if it dont pull in and stay , it will not run.

Ill stop there. until you say what engine and country car resides.
export jeeps are wired different (laws)

Feb 15, 2014 | 1987 Jeep Comanche

1 Answer

How to replace cam sensor


This unit is part of the distributor.




OPERATION


See Figure 1
The ECM uses the camshaft signal to determine the position of the No. 1 cylinder piston during its power stroke. The signal is used by the ECM to calculate fuel injection mode of operation.
If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injected mode based on the last fuel injection pulse, and the engine will continue to run.



0900c1528008f0d2.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 1: Camshaft Position (CMP) sensor location


TESTING


See Figure 2



0900c1528008f0d3.jpg enlarge_icon.gifenlarge_tooltip.gif

Fig. Fig. 2: Camshaft Position (CMP) sensor wiring schematic

  1. Disconnect the CMP sensor wiring harness and connect an LED test light between CMP harness terminal C and battery ground.
  2. With the ignition ON and the engine off, verify that the test light illuminates.
  3. If not as specified, repair or replace the fuse and/or wiring.
  4. Carefully connect the test light between CMP harness terminal A and C and verify that the test light illuminates.
  5. If not as specified, repair the CMP harness ground circuit (terminal A).
  6. Turn the ignition OFF and disconnect the test light.
  7. Next, connect suitable jumper wires between the CMP sensor and CMP sensor harness. Connect a DC volt meter to the jumper wire corresponding to CMP terminal B and battery ground.
  8. Start the engine and verify that the voltage signal is 5-7 volts.
  9. If it is not as specified, the CMP sensor may be faulty.


REMOVAL & INSTALLATION


  1. Disconnect the negative battery cable.
  2. Detach the sensor harness connector at the sensor.
  3. Unfasten the retaining bolt, then remove the sensor from the camshaft housing. Inspect the sensor O-ring for wear, cracks or leakage and replace if necessary.

To install:
  1. Lubricate the O-ring with clean engine oil, then place on the sensor. Install the sensor into the camshaft housing.
  2. Install the CMP sensor retaining bolt, then tighten to 88 inch lbs. (10 Nm).
  3. Attach the sensor harness connector.
  4. Connect the negative battery cable.

Feb 15, 2011 | 1996 Chevrolet C1500

1 Answer

1987 chevy r20 carb with electric fuel injection


I would check the wires that make the injector function to see how much power is going to them (using a multimeter). Now check the wires on the injector that is not working and see if you have power there. If you do then you have a bad injector. I don't think you do since you said that you switch wires and you are getting fuel at that injector. Check your wiring harness for shorted out wires. It doesn't make sense for one side to be working and the other not to be. I don't think it is a problem with your ECU, but it may be. See what colors the wires are going to your injectors and trace them back to the ECU, a wiring diagram would help. You need to check to see if you are getting power from the control module to the harness. I believe, however, you are experience a shorted out wire somewhere in the harness. That is where I would start. If you confirm you are getting power to the control module, but you are losing it somewhere in the harness it may be easier to just run a new set of wires instead of tearing apart the harness.

Apr 16, 2010 | 1987 Chevrolet G20

1 Answer

My 1990 Chevy Celebrity wagon 3.1 multiport fuel injection is getting fuel to the rack at 45psi, but is not going through the injectors. Any idea the probable cause?


DO YOU HAVE 12 VOLTS ON INJECTOR WIRE ON ONE SIDE WITH KEY ON? IF SO ARE YOU GETTING SPARK? IF YOU HAVE NEITHER YOU MAY NEED A NEW CRANK SENSOR. VERY COMMON ON THIS ENGINE WHEN THERE IS A LOSS OF SPARK AND INJECTOR PULSE. INJECTOR PULSE(GROUND SIDE)IS CONTROLLED BY THE COMPUTER. IF YOU HAVE SPARK BUT NO INJECTOR PULSE AND 12 VOLTS ON INJECTOR FEED WIRE YOU MAY HAVE A FAUTY ECM(ENGINE COMPUTER)

Aug 31, 2009 | 1990 Chevrolet Celebrity

1 Answer

1987 ford f350 7.5L 460cc carburator wiring diagram


The wiring harness is different for a carburated truck. You can get the wiring books from the dealer, or try to find it on line.

Jun 18, 2008 | 1987 Ford F 350

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