Symptoms of Injector Problems

Lack of Power

Vehicle has lost its performance

Poor Fuel Economy

Vehicle uses excessive amount of fuel

Excessive Exhaust Emissions

Vehicle fails emissions test and O2 sensor failure

Hard Starting

The vehicle is difficult to start either hot or cold

Rough Idle

The vehicle does not idle smoothly

Poor Driveability

The vehicle suffers with hesitation and pings

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ASNU Fuel Injector Service now available!

VanGordon & Brown Performance can comprehensively test the performance of all types of top feed and side feed multi-point as well as mono/single point gasoline fuel injectors. Up to eight top feed or six side feed injectors can be tested and cleaned at one time.
Odds are good you are driving a fuel injected vehicle that delivers fuel to each cylinder individually. Odds are also good that each injector does not flow the same amount of fuel to each cylinder as commanded.

With a multipoint EFI system, the engine management computer delivers a command to the injectors based upon what the Lambda sensor (oxygen) says is occuring in the exhaust. Since the lambda sensor typically is looking at an average of 3 to 4 cylinders, it may be possible that you have one or more cylinders that are being starved for fuel because the injector for another cylinder has a greater flow rate.

What does this mean? Any or all of the following can occur:

  • Excessive emissions
  • Poor fuel economy
  • Poor engine performance, rough idle, hesitation, power loss.
  • Detonation (pinging)
  • Excessive cylinder temperatures
  • Engine damage
Do you have a "high performance" vehicle? If so, your engine will benefit greatly when the injectors undergo a performance evaluation and cleaning. Not only will you experience greater response and engine performance, but improved fuel economy as well.

To the right is a set of injectors from a 1999 LS1. This vehicle had two problems when it arrived at our shop. Symptoms observed:

  • Cylinder misfire, black smoke, and stalling at idle
  • Detonation during WOT (wide open throttle) above 5000 rpm
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Solutions to problems of this type include testing all injectors for leaking pintle seats, correct atomization, proper spray patterns, matched fuel flow volumes, and correct solenoid operation of opening/closing injectors through a range of pulse timings.

Once analyzed and the results recorded, these injectors can be thoroughly and safely cleaned in an ultrasonic cleaning bath. After cleaning, the injectors are retested and their performance after cleaning is recorded and compared to initial results before cleaning. After undergoing this process, injectors restore engine performance, drivability, and economy.

Injector performance and read-out before ASNU ultrasonic cleaning
Injector performance and read-out after ASNU ultrasonic cleaning
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