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Saturday, November 26, 2011

How to Test Fuel Injectors

Article provided by wikihow the wikihow manual.

The use of auto fuel injectors is a sophisticated way to provide the right fuel and air mix to an engine for a vehicle. The small cylindrical fuel injectors play a specific role in a larger fuel intake system, along with other elements like the fuel pump and the fuel tank. Over time, fuel injectors may need to be maintained or checked for proper functioning. They are vulnerable to specific kinds of wear and generally will not last forever. If you need to check fuel injectors to make sure they are working properly, here are some of the most common basic steps suggested by mechanics and auto pros who have extensive knowledge of the fuel delivery system.

Steps

  1. 1
    Remove fuel injectors or lead wires if necessary. For some types of testing, it's necessary to remove the fuel injectors from their housings. For checking with an ohmmeter, just take the wire off of the fuel injector.


  2. 2
    Check fuel injectors with electronic tools. The electronic fuel injection system relies on electronic signals that control how these items operate. Using a multimeter or an ohmmeter, you can check the electrical resistance of the fuel injector to make sure it's working properly. Experts say less than 10 or 12 ohms is a signal of malfunction.
  3. 3
    Decipher sounds. Along with checking a fuel injector electronically, you can listen for certain kinds of sounds that will tell you when a fuel injector might not be working correctly. A clunking sound or similar warning sound may show that the fuel injector is not functioning the way it should.
  4. 4
    Test fuel injectors manually. Machine shops and auto manufacturers sell various machines that will manually test and clean fuel injectors. Using these machines, you can see if the fuel injector is actually delivering the spray or mist that it is supposed to into the fuel air mix.
    • Use flow tests. Many of these manual testing machines have flow testing systems that show how much fuel the fuel injectors are delivering into the system.
    • Analyze spray patterns. Over time, fuel injectors get clogged. The original spray can be decreased. Manual testing of fuel injectors can help to determine if this has occurred by pressurizing the fuel injectors and measuring spray patterns.
    • Use manual fuel injector machines to clean the fuel injectors. Many of these machines also have the ability to unclog the fuel injectors to help them work better.


Tips

  • Consider preventative maintenance for fuel injectors. Checking and cleaning these items every 25,000 miles, or once per year, will help your vehicle drive better over the long term.
  • Understand your particular fuel injection system. Car experts point out that different vehicles have either a single point or a multiple point fuel injection, which can have a bearing on how the fuel injectors wear and how they function correctly.
  • Check additional parts like the fuel filter. The fuel filter cleans the fuel before it gets to the fuel injectors. If the fuel filter is not working properly, this may impact the function of the fuel injectors as well. Along with the fuel filter, you can also check and maintain air handling devices like the air filter to help your vehicle benefit from a correct fuel air mix.
  • Article provided by wikihow the wikihow manual. Please edit this article and find author credits at the original wikiHow article on How to Test Fuel Injectors All content on wikiHow can be shared under a Creative Commons license.

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