Join Date: Sep 2011
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To clear some things up.
Your car has a MAF (mass air flow sensor with built in IAT sensor) not a MAP (manifold absolute pressure) sensor. MAP is old technology and Toyota stopped using them in the late 90's early 2000's. The MAF replaced both the ancient AFM (air flow meter) and MAP sensor technology on all Toyota vehicles. For a dealership to be wrong on this shows they have no grasp on their product. If it was a service writer I wouldn't be surprised, if it was technician find a new dealer.
As for your issue. It sounds like you have something intermittently wrong. That dealer is lazy or incompetent. You can easily diagnose a problem area with the tech stream Toyota scan tool. That advanced piece of equipment is capable of telling you so much info it is ridiculous. It can tell you injector pulse, which solenoid in the transmission is working, fuel trim, throttle sensor voltage, intake air mass, intake air temp, coolant temp, misfire count and the list goes on. It even allows you to active test a bunch of cool stuff like turning the VVT-i ON/OFF, EVAP system ON/OFF, fuel pump ON/OFF, transmission solenoids ON/OFF, and the list goes on.
It reaches inside and unlocks the ECU for the technician. That technician can easily check the signals and misfire counts and see where your problem areas are.
I say find a competent dealership and even mention this post. This should be a non issue.
Aside from that you may have an intermittently failing part. Something like a fuel injector, coil, VSV, or something is not working all the time. I would suspect a VSV. Throwing parts at a car is never a good idea unless you work at a junkyard.
My Toyota List:
82 Corolla SR-5 Hardtop 1JZGTE M/T
03 Corolla LE 1ZZFE A/T
05 Corolla CE 1ZZFE M/T
09 Camry LE 2AZFE A/T
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