What is your question?
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What is your question?
When I accelerate quickly my 4Runner hesitates(best way to describe-is it feels like it's coughing trying to get air). We took it to the dealer & they replaced plug wires & did a fuel injection flush. It seemed to have fixed the problem, but a month & half later it started doing the same thing again. I did notice, however, that when I accelerate gradually it does not hesitate/cough, but when I do a quick acceleration it does. According to repairpal it seems to be a common problem with the MAF(some of the symptoms are similiar). I am open to any diagnosis, suggestions or confirmation as to what it could be? Thank you.
1 Reply
Have the Mass Air Flow Sensor checked. Any Check Engine Light? Have a good diagnostic shop run the Mass Air Flow Sensor tests using a data streaming scanner and a lab scope. Also have them look at the long term fuel trim. Any code P0171, P0172, P0171 or P0174? See if the Long Term Fuel Trim is above 12%. If you have 12% or above and no Oxygen sensor codes, it could be that the Mass Air Flow sensor is 'under reporting' causing a lean hesitation, meaning that it is worn out. Only use a factory part, the after market Mass Air Flow Sensors don't get the job done.