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How do you check if the injectors are firing - Cars & Trucks

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They should have power and a ground signal from the computer. You would use a low voltage light to watch for the flash on each injector.

Posted on Jul 10, 2013

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Posted on Jan 02, 2017

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My 1993 Dodge Dakota 3.9l v6 4x4 magnum wont fire it will crank over but no fire? The fuel pump relay, crank shaft sensor , spark plugs and wires were replaced. I don’t know a lot about this no fireing...


check the compresion in all cylinders 100 psi (compression good) check the spark -check the fuel pressure.30 psi at gauge with switch on.(if no keep pressure with switch off injectors or fuel pressure regulator are bad
check the signal to the injectors (get little injectors tester at autoparts) if no signal check the ground to the injectors black wire
or the other wire (computer)= good signal to injectors and good fuel pressure and good spark (defective injectors)

Oct 16, 2017 | Dodge Cars & Trucks

1 Answer

1990 eighty eight 3.8l. Why no fire/pulse to the injectors?


The camshaft sensor may be bad. Check the fuse for the injectors and it is possible the ECM is bad or the injector drivers more specifically are bad in the ECM .

Nov 24, 2015 | Oldsmobile Cars & Trucks

1 Answer

What sensor needs replaced for fuel injector


The cam runs the firing sequence of the injectors, But if it dies, the ECM will still fire the injectors from memory. Your truck will still run. There is an injector fuse. Check that and check fuel pressure.

Sep 07, 2015 | 2000 Chevrolet Blazer

2 Answers

I have a Mitsubishi gallant cylinder number 1 not firing but spark plug is firing engine misfire,engine check comes on for it to start and it has a hard start help.


If you have spark, but no fire, then check injector for proper activation. If good, check compression. If injector good, and compression bad, possible head gasket, valve, piston, etc.

Jun 08, 2015 | Mitsubishi Galant Cars & Trucks

1 Answer

3 rear cylinders not firing


Check the grounds from the rear injectors to the computer. On a bank fired system as yours, all 3 injector grounds on each bank splice together before they go into the computer. Check wire continuity from injector to the computer connector with the ohmmeter.

Jul 21, 2014 | 1989 Oldsmobile Cutlass Ciera

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.

Jun 28, 2014 | Cars & Trucks

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My injector dont work and i need to know why


CHECK FUEL PUMP AND FUEL INJECTOR FUSE.IF FUSE IS GOOD.YOU NEED A NOID LIGHT TO CHECK TO SEE IF INJECTORS FIRING.YOU CAN BUY A NOID LIGHT AT ANY AUTO PARTS PLACES.WHAT YOU DO DISCONNECT FUEL INJECTOR CONNECTOR.HOOK NOID LIGHT TO CONNECTOR.CRANK ENGINE TO SEE IF NOID LIGHT BLINKS.IF YES INJECTORS FIRING.IF YOU GET STEADY LIGHT.PCM NOT WORKING NOT FIRING INJECTORS.IF YOU GET NO POWER OR LIGHT DONT WORK.YOU HAVE A WIRING PROBLEM.YOU NEED A HAYNES REPAIR MANUAL LOOK AT THE ELECTRICAL WIRE DIAGRAM.TO TRACE FAULTY WIRE.

Mar 21, 2010 | 1989 Chevrolet G10

1 Answer

Mazda MX-6 v6. One clyinder is not firing. Spark


Switch it with another and check if the miss follows the injector.
Also you should check for a voltage pulse at the missing cylinder injector connector.

Sep 24, 2009 | 1996 Mazda MX-6

3 Answers

Good spark -- fuel supply line has fuel -- will not start -- either sprayed into air intake -- car immediately fires -- why are cylinders not getting fuel?


possibly a bad pressure regulator or injector module not letting the injectors fire. check out both more than likely the injectors are not firing.

Aug 30, 2009 | 1989 Buick Riviera

2 Answers

Only one injector is firing


There is a sensor on the camshaft that send the signal to the sparks plugs and to the injectors in order to have spark and fuel in the right time. Check first this one. Is still dont have the right fuel on time, check your computer. If not the computer, not the sensor, then check your engine timing.

Aug 14, 2009 | 1996 Dodge Neon

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