Car: Chevrolet, Malibu, 2001, 140000 miles, 3.1L-6 Cylinder engine.
Operational symptoms: Car runs smooth and does not seem to misfire or stall at 1000 or more RPM. Rough running or misfiring occurs primarily when stopping or breaking/slowing for a turn.
OBD 'check' engine light illuminated. Diagnostic codes retrieved with code reader are:
P0300 - Random/Multiple Cylinder Misfire Detected
P0401 - Exhaust Gas Recirculation Flow Insufficient Detected
I replaced the spark plugs last week (3/16/07) and the spark plug wires were replaced in 10/2005 (~27000 miles ago). The repair shop says to replace the Throttle Detection Sensor and the Idle Arm Control. They did not indicate what diagnostic codes they retrieved from the OBD memory.
The auto-parts store (AutoZone) suggest that I clean the EGR valve or replace it. The diagnostic codes retrieved with their OBD reader were P0300 & P0401, as displayed above. Their suggestion seems to fit the diagnostic better.
Is the repair shop pulling my leg or are they smarter than the average technician or are they just not too bright?
Your assistance & insight is much appreciated and I will be glad to send a donation / contribution by check if you will include the payee and address with your reply.
Sunday, March 25th, 2007 AT 7:39 PM