How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask Jared D Your Own Question
Jared D
Jared D, ASE Certified Technician
Category: Toyota
Satisfied Customers: 1780
Experience:  Shop Supervisor at County Fleet
Type Your Toyota Question Here...
Jared D is online now
A new question is answered every 9 seconds

2003 tacoma v-6 133000 miles 4x4 started missing suddenly.

Customer Question

2003 tacoma v-6 133000 miles 4x4 started missing suddenly. took to my mechanic, new plugs, wires now runs good but won`t idle cold, kicks back on hard acellaration in first two gears {5 speed} code shows problem with air flow sensor but replacing it made no difference. pulling the plug to this sensor doesn`t change anything. mechanic says pulling this connector should make engine run crazy but it doesn`t change a thing. scratching head.
Submitted: 1 year ago.
Category: Toyota
Expert:  Jared D replied 1 year ago.

If you can unplug the MAF and it doesn't change the way it runs then the MAF isn't sending a signal to the PCM. I'm willing to bet that there is a wiring problem from the MAF. Which code did you pull?

Expert:  Jared D replied 1 year ago.

Have you tried to to a throttle position relearn? I had one lose calibration once and I had to manually force a relearn.

1. Disconnect the battery cables and cross them together.

2. Hold then crossed for about 1 minute.

3. Then hook up the positive cable, but before you connect the negative hold the throttle flap closed all the way on the throttle body. I had to have a helper.

4. Then connect the negative battery cable. It should learn the closed throttle position as the idle position.

5. Start the truck and see how it runs.

Related Toyota Questions