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2017 Chevrolet Express 3500

//2017 Chevrolet Express 3500

2017 Chevrolet Express 3500

Chevrolet Express 3500

Mileage
95,504
Service Date
4/15/2022
Services Performed
  • We scanned for codes and found P0171 lean bank 1 and P0174 lean bank 2. We then monitored live data and verified the engine is running lean. We checked the mass air flow sensor and found it dirty. We cleaned the mass air flow sensor and monitored live data again and found no change in the fuel trim data. We checked for a vacuum leak in the front of the intake and did not find any. The next step is to remove the passenger seat and dog house and trouble shoot first by check fuel pressure at the back side of the engine area. We removed the passanger seat and dog house and found a vacuum leak from a vacuum line at the back of the intake. We removed the line and found a second vacuum line leaking as well. We replaced both vacuum lines, cleared the codes, monitored live data, and found thenfuel trims are now within spec. We test drove the vehicle and no codes returned.
  • We connected the A/C machine and found the high side pressure was higher than spec. We recovered the system and found it was over charged causing the compressor to short cycle. We replaced the service valves pulled the system into a vacuum and re charged with the proper amount of refrigerant. We tested the A/C and found it now is operating according to specification.
  • Service air conditioner. Check condition of all belts and lines. Evacuate and recharge with reclaimed R-134. Test system performance. Note center vent temp Max Cool/High____41_____ Connect gauge set and advise of High and Low pressures @ 1500 Rpm. Ambient_____70____High__225______Low____28___ Inspect Belts, hoses, fan clutch, and electric fans if equipped and advise of recommendations.
  • We checked for a power steering leak and did not find any leak from the lines, the pump, or the steering box.
 
Dave B. gave our service a 5 star review on 4/15/2022
2022-04-16T22:03:14+00:00