Regal V6-191 3.1L (1991)
General Motors has conducted extensive injector cleaning studies to determine effectiveness. There is no confirmed evidence that cleaning Multec port
fuel injectors has resolved a vehicle driveability problem. In addition, suppliers of various injector cleaners may claim that their product can also clean
intake valve deposits. General Motors laboratory tests have shown that injector cleaners have little or no effect on intake valve deposits.
General Motors maintains the position that Multec port fuel injectors should not be cleaned.
