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Re: fuel injectors won't open
Wow! an '82. Nifty. Yes, it could be a grounding problem. The older systems used injectors that draw a lot of current. Especially check grounding between the fuel 'computer' box and the engine. Physically/visually check terminals or use a light bulb tester. A volt-ohmmeter is not reliable when checking high current circuits because it doesn't demand high current flow.
I saw the exact type of thing on an older BMW not long ago.
This is a common problem first try carefully remove the retainer clip wire that holds the plug on use a volt ohm meter plug them in plug set for 12v dc turn engine over to see if your getting pulse from ecu if not check fuel injection relay check all your your relays try using dielectric grease and lightly coat all pins push up and down to allow good contact with all pins if you are getting good signal bad injectors
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Check the injector circuit. There should be a fuse for the injectors. Each injector has a power wire and a ground wire. The power wire should show current when key is on. Your fuel pressure should show around 50 psi with key on. Is it? How to check the injector ground circuit: Use a test light. Clip the lead of the test light to the positive battery post, and use the probe into the ground terminal of an injector connector (the connector is unplugged). Now observe the test light while someone cranks the car. If injector ground circuit is working right, the test light will be blinking-meaning the computer is correctly grounding the injector circuit for a split-second each time the light blinks. If no light, check ground wire from injector to computer. If light does not blink but is steady, computer failure.
if the injector fuse is blown then the car won`t start as its not getting fuel into the motor to fire.if the fuse keeps blowing then you could have an injector/s that is drawing too much or the injector driver in the ecm may not be any good and needs replacing or a used ecm.it could be a short some where in the wiring for the injector system that is going to ground.
Pull off one injector connector and use a test light or voltmeter to see if one wire has power with key on.
Power to the injectors is fed through the ignition switch, so with key on, you should have power there. The injector ground is inside the ECM. If you have power, you'll have to diagnose the circuit for why computer doesn't ground the circuit when it should.
you need to have the fuel pressure checked with a gage and volume as if its not at the spec the injectors won`t open to spray enough fuel.also you should check the injectors for proper voltages and ground as if these are not within specs then the injectors won`t work either
i assume your talking noid light for the injector.have you checked for battery voltage at the injector and for the ground side of the circuit at the injector as either one missing it won`t work.the injector is grounded by the computer and the power is supplied when the key is turned on.these are the two places to start to check.
Hello! Please tell me what you meant by "We took the wires to check for mass"?
However, you are correct, it is fuse #5 10amp. It is located in the under hood fuse block. Change the fuse; If it does not hold perform the following test...
With key off...Disconnect the Injector's plug in connectors...Each connector has two wires marked A and B...A goes to battery feed and B to the Power Train Control Module (PCM)...
Using an ohm meter set on the X10 scale measure from each plugs pin A to ground...It must be open, no needle deflection...If you read any resistance at all, the hot lead which is common to all injectors, is grounded in the harness...
Next measure from each injector (both pins) to ground...You should read zero ohms,,,No resistance to ground...If any one injector reads to ground it is defective...Replace...Since all injectors are tied to common battery, any one injector shorted to ground will short all of them to ground...