Car Repair Troubleshooting GuideStep 1 - Test for DTS's (Diagnostic Trouble Codes): For this you need a trouble code scanner. The trouble code scanner is a small hand held electronic device that plugs into the vehicle's OB2 (OBD11) diagnostic connector. Locate the vehicle's computer connector (ALDL), most are on the lower driver's side. In some vehicles you might need to look around a little, on the passenger's side, and around the center console under a plastic cover. For more information, check the vehicle's owner's manual. This device gathers information that was stored in the vehicle's PCM. This information or trouble code can inform you about the system or sensor that is malfunctioning. Look up the code in our diagnostic trouble code chart. After repairs have been made use the code scanner to clear trouble codes and recheck system.
Check Engine Light Service Engine Soon VideoStep 2 - Testing Fuel Pressure: Test for proper fuel pressure with a fuel pressure gauge. Connect the gauge to the test port on the fuel rail. Fuel pressure reading's vary depending on the system for the vehicle, most throttle body injection cars (TBI) are between 13 psi and 17 psi and most (DPI) direct port inject systems are between 40 psi and 55 psi. To find out the vehicle's system fuel pressure consult a car repair manual. If fuel pressure is not within specification the fuel pump needs to be replace.
Checking Fuel Pump Pressure VideoStep 3 - Plugged Fuel Filter: A plugged fuel filter can cause an engine to surge. Proper fuel system pressure is critical to fuel injected engines, other wise there will be inconsistencies in performance. To check for this condition remove the fuel filter and inspect, replace with new unit and recheck system.
Fuel Filter Removal