This 2002 Ford F150 with a 5.4 liter engine came in with the service engine soon light on and a P0401 code stored. This same general test applies to most Ford, Lincoln and Mercury vehicles with EGR valves and DPFE sensors. Wire colors may vary and you may wish to consult a wiring diagram. It … Continue reading “2002 F150, P0401 Insufficient EGR Flow”
This 1997 Chevrolet S10 Blazer cam in with the service engine soon light on and a complaint of low power. Checked data with Tech 2 scan tool and found codes P0102 MAF sensor circuit low frequency and P0340 cam position sensor circuit. I checked CMP retard and found it fixed at -60 degrees. … Continue reading “1997 Chevrolet S10 Blazer, Codes P0102 and P0340”
This 2004 Ford F150 Pickup came in with the complaint that the vehicle would not accelerate. I checked codes and found a code P2100 stored for and open circuit in the throttle body motor. In order to test I had to remove the breather assembly. I removed the hold down bolts. Disconnected the sensor harness. … Continue reading “2004 Ford F150, Code P2100, Will Not Accelerate”
This 2003 GMC Envoy came in with the complaint that the a/c will only blow out the defrost and floor. Not through the dash vents. I checked codes and found a code B0263 for a fault with the mode actuator. I first ran into this problem after changing a battery in one of these vehicles … Continue reading “2003 GMC Envoy, No A/C Vent Control, B0263”
This 2001 Ford Expedition came in and the customer requested that the EGR valve be changed. I asked why and was told the parts store checked it and it had a code P0401 for insufficient EGR flow. I said okay, but I was willing to bet that the EGR valve was okay. The customer asked … Continue reading “2001 Ford Expedition, Testing The EGR Valve”
This 1998 Pontiac Grand Am Gt with a 3.1 Liter V6 came in with a surging idle and service engine soon light on. I checked codes and found a code P0171 stored for Fuel Trim System Lean. Sounds like a vacuum leak to me. I tested with propane and found that by adding fuel near … Continue reading “1998 Pontiac Grand AM GT, P0171”
This 2003 Ford Windstar came in with the service engine soon light on. Checking code revealed codes P0171 and P0174, banks 1 and 2 lean. I checked for vacuum leaks and none were found so I moved on to the Mass Air Flow sensor. It is common for them to get dirty and cause these … Continue reading “2003 Ford Windstar P0171 and P0174, Banks 1 & 2 Lean”
This 1997 Infiniti Q45 came in with the complaints of poor acceleration,surging idle and the service engine soon light on. I checked codes and found 9 codes stored. I knew that most were probably induced or false codes so I cleared the codes and then ran the engine till the SES light came back on. … Continue reading “1997 Infiniti Q45 Poor Acceleration,Surging Idle And Service Engine Soon Light On.”
This 1999 Pontiac Grand Prix came in with the Service Engine Soon Light on (SES) and a code P0125. The code refers to an engine coolant temperature excessive time to enter closed loop fuel control fault. Simply put the engine did not come up to operating temperature as quick as the computer thought it should. … Continue reading “1999 Pontiac Grand Prix Code P0125”
2001 Pontiac Grand Am with 2.4 liter engine was brought in with the SES light on and a complaint of tip in acceleration problem and rough idle. The codes that were stored were P0105 for a MAP sensor malfunction, P0172 for a system rich fault and P0300 for a general misfire fault. I opened the … Continue reading “2001 Pontiac Grand Am, Codes P0105, P0172 and P0300”