Injection Signal Noid

Injection Signal Noid

If your fuel injected Jeep is running rough like it has a miss on one cylinder, the trouble may be a bad fuel injector. Fuel injection is great when everything is working correctly but sometimes trouble shooting the system can be like shooting in the dark. You can't just remove the air filter and look inside like you can with a carburetor.

I have been working with a 1989 Jeep Cherokee six cylinder recently. The truck did not run when it came to me and I did not know its history.

One I got it running, it had a distinct miss of a dead cylinder. I first checked to make sure it was getting spark to all the plugs. I did this first by using my in line spark tester. This tool flashes when the coil sends fire to the plug. All six were flashing. I then pulled the spark plugs out one at a time and visually inspected them. They all looked fine and all looked the same giving me no clue which one was the trouble cylinder.

On older engines, you could simply remove the plug wires one at a time to see which one did not make any difference in the way the engine runs. However, I have found that you can't do that on modern electronic ignition systems as the power in the spark plug wire will give you a very uncomfortable zap if you try to remove it while the engine is running. So I don't use that method on modern engines.

Next I checked the fuel pressure at the fuel rail. The pressure was within specifications so I moved on to testing individual injectors.

To check the injectors, I used a mechanic's stethoscope. I placed the tip of the stethoscope on each injector body and listened at idle. On the injectors that worked correctly, there was a very distinct ticking sound. On the injector that was giving trouble, there was no ticking sound. I moved the stethoscope back and forth between injectors a few times to get a clear image of the sound that it was supposed to make when it was working.

Before removing the fuel rail to change the injector, I tested the electrical signal to the injector. I made a simple test lamp using a parking light socket and bulb and plugged it into the wiring harness. Since the light blinked, I knew the injector was getting power and must be stuck or bad. You can also purchase a noid light that will plug into the harness, but for a quick check you can make a simple test lamp like I did.

To test the fuel injector firing coil you can use an ohm meter. Simply disconnect the wiring harness form the injector and place the probes across the two contacts of the injector. An intact coil will read around 15 ohms. However, as seen on this Jeep, an intact coil does not mean the injector works.

Once you have located the injector giving trouble you will have to remove the fuel rail to replace it. See my other articles for how to replace an injector or repair a leaking injector.

Mike Strawbridge is a Performance Improvement Coach who loves helping people achieve what they truly want in life, business and off road.

To learn more about Jeep Repairs and modifications see ==> http://thejeepguru.com

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Astro Pneumatic AST7898 Deluxe Noid Lite and GM Signal Test Light Set $39.12 Features and Benefits: The most economic way to check electronic fuel injection (EFI) signals Quickly and easily checks for systems of GM TBI Bosch PFI Ford TBI GM PFI Geo TBI and GM SCPI To test just disconnect the fuel injectors plug the Noid Lite into injector wiring harness then crank the engine Normal voltage is indicated by flashing light which is visible from passenger compartment Blow molded case for easy storage and transport

Noid Light Set $55.95 ? Quickly, easily and economically test electronic fuel injection signals. ? Supplied with lights to check GM TBI, Bosch PFI, Ford TBI, GM PFI, Geo TBI and GM SCPI. ? Easy to use - just disconnect the wiring to the fuel injectors, install the Noid Light into the injector wiring harness and crank or start the engine to view the light pattern.By Tool Aid.

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8 Pc. Noid Light Test Kit With Extension Harness $79.95 Noid Lites are a proven test device to quickly determine if the electrical signal is present at the fuel injector. ? Just plug in and turn over the engine; flashing noid indicates good signal. ? Expanded set of eight Noid Lites cover: GM PFI, Ford TBI, Geo TBI, Bosch PFI, GM TBI, GM SCPI, and now new applications of Bosch 2 and Multec 2. ? Kit comes in molded plastic case and includes a harness extension that allows for convenient remote viewing from the driver?s seat.By OTC.

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Lisle Universal Noid Light With Windshield Mount $39.64 Adjustable probes fit all electronic fuel injection systems. Versatile tool tests throttle body injectors, ported fuel injectors, and sequential central port injectors One person operation - Tool attaches to windshield with suction cup to allow viewing of indicator light from front seat while cranking engine.

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Tool Aid TA36330 Noid Lights IAC Test lights and Spark Checker Kit $52.46 Quickly easily and economically test electronic fuel injection signals. Supplied with lights to check GM TBI Bosch PFI Ford TBI GM PFI Geo TBI and GM SCPI. Easy to use just disconnect the wiring to the fuel injectors install the Noid Light into the injector wiring harness and crank or start the engine to view the light pattern.

Tool Aid TA 36350 InLine Spark Checker for Recessed Plugs Noid Lights and IAC Test Lights Kit $61.57 Use to test spark plug circuits electronic fuel injection signals and idle air control circuits. Includes: No. 23970 InLine Spark Checker Kit for Recessed Plugs. This is a must for testing newer vehicles with recessed spark plugs. Can also be used to test conventional and coilon plug ignition systems. 8 Noid Lights for checking GM PFI Ford TBI GEO TBI BOSCH PFI GM TBI GM SCPI BOSCH 2 and GM MULTEC 2 2 IAC Test Lights for straight and 90 degree applications. Quickly diagnose no start and engine misses conditions in the electrical fuel injection and spark plug circuits. Analyze rough running engines.

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Tool Aid TA 36310 Electronic Fuel Injection and Ignition Spark Tester Kit $36.89 Quickly diagnose no start and engine miss conditions in the electrical fuel injection and spark plug circuits. Analyze rough running engines. Contains a noid light set to test electronic fuel injection signals and a inline ignition spark checker shows a duplicate view of ignition spark. Supplied with instructions in a durable plastic molded storage case.Noid light are supplied to check: Bosch PFI Ford TBI Geo TBI GM PFI GM SCPI GM TBI

Lisle Universal Noid Lite. Each $30.57 Manufacturer: Lisle. Each. Features Benefits: One-person operation Two probe adapters screw on to form larger diameter probes Versatile tool tests throttle body injectors, ported fuel injectors and sequential central port injectors Universal Noid Light

Behringer Ultra-DI Passive Direct Injection Box $33.99 This direct injection box allows you to connect an instrument to a mixer or amplifier while matching the impedance and signal for lush audio. The ground lift switch eliminates hum associated with ground loops for clear sound.

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OTC OTC3054E 11 Piece Noid Lite Set $70.02 Features and Benefits: . Simplest method for eliminating the EFI system or idle air control as possible faults on nostart vehicles. Disconnect the fuel injectors plug in a Noid Lite and crank the engine; a flashing light indicates normal pulsing voltage. Expanded set of eight specific Noid Lites covers: GM PFI Ford TBI Geo TBI Bosch PFI GM TBI GM SCPI. And now new applications of Bosch 2 and Multec 2 plus two GM IAC testers. Includes a molded plastic case and harness extension that allows for convenient remote viewing

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11 Pc. Noid Light And Iac Test Kit With Harness Extension $101.95 Simplest method for eliminating the EFI system or idle air control as possible faults on no-start vehicles. ? Disconnect the fuel injectors, plug in a Noid Lite, and crank the engine. A flashing light indicates normal pulsing voltage. ? Expanded set of eight specific Noid Lites covers: GM PFI, Ford TBI, Geo TBI, Bosch PFI, GM TBI, GM SCPI, and now new applications of Bosch 2 and Multec 2, plus two GM IAC testers (flat and square four connector applications) with red and green LEDs. ? Includes a molded plastic case and harness extension that allows for convenient remote viewing from the driver?s seat. By OTC.