![]() Once you find the fuel injector that’s not working, it’s time to figure out why. How to determine the cause of bad fuel injector symptoms Be sure to use any of the other three methods to confirm. Sometimes, you can still get the correct readings on an injector that’s stuck on the inside. Look for the fuel injector whose specs are skewed. Connect one lead to one side of the injector and the other lead to the other side. Step 4: Check for resistance using a multimeterĬompare the resistance between all the injectors using a multimeter. ![]() It will show you which injector is not producing any vibrations. All you have to do is place it on each injector while the engine is running. Step 3: Use an electronic fuel injector quick probeĪn electronic fuel injector quick probe helps to detect the vibration frequencies that arise when the injector pintle opens. When you find an injector that’s not making any noise, that’s the one you should take a look at. Listen and compare the sounds they produce. To identify where the problem is, place an automotive or mechanic’s stethoscope on each injector. When the engine is running, the valve fitted at the end of the fuel injector opens and closes repeatedly to let fuel into the intake runner. Step 2: Check for noise using an automotive stethoscope Fits Automotive scanners are also useful in identifying a break in the circuit. It will normally generate a diagnostic trouble code for the bad injector. Step 1: Use an automotive scan tool to identify a bad fuel injector FitsĪn automotive scan tool is an electronic device that can help you determine which cylinder is misfiring. The following steps will help you to just do that. If you experience symptoms of a bad fuel injector, there are four ways you can go about finding the bad injector. The valves move in and out repeatedly to atomize the fuel and send it to the engine cylinders. ![]() They also have wires connected to the side that power them, ground them, and help to control their valves. How does multi-port injection work?Ī typical multi-port injection system features a fuel rail that sends pressurized fuel first into the fuel injectors, then into the intake runners, and into the combustion chamber through the intake valves.įuel injectors have an electromagnet just near the nozzle that’s controlled by the PCM. In this post, we’ll take a look at multi-port injection – the middle ground between the two mechanisms and the most commonly used. Newer vehicles use direct injection, where the fuel is directly injected into the combustion chamber. Some older cars use a TBI – a ‘throttle body injection’ mechanism that injects fuel directly into the throttle body. In a typical engine, each cylinder will have its own fuel injector. The fuel is passed through a nozzle that helps to distribute it evenly for optimum efficiency and combustion. What is a fuel injector?Ī fuel injector is a valve mechanism designed to spray liquid fuel erratically into an engine cylinder. In this post, we will teach you how to diagnose a bad fuel injector, how to determine where the problem is, and how to fix it. You can also have a misfire when there’s an issue with the spark plugs, the wires connected to the spark plugs, or the ignition coils. sorry, not for 1988 injectors.How to Diagnose and Fix Bad Fuel Injector Symptoms Pay attention to the polarity BEFORE you must your harness!ġ984-1987 square connector type include connector, wire clip, 7” of pigtail wires and some shrink tubing. Soldering is highly recommended along with shrink tubing and proper insulation. **YES! POLARITY MATTERS! Keep track of which wire goes to which side of the harness connector/injector. A loose or broken connector can cause the injector not to pulse causing rough idle, lean run and a list of other issues. The “last guy” broke the plastic or lost the wire to keep in in place (it’s never you, is it?).ĭon’t let a broken harness connector cause a hard-to-find drivability issue. Since your harness connectors have been through the wringer, here are some replacements.Īfter 30 years, your connectors are getting crispy and brittle and the wires have seen so many heat cycles, the insulation is hard cracked. Fuel injector harness connector **also fits your cold start injector and your cold start thermo-time switch
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