My Tacoma recently has started to have a whining noise while in gear especially at speeds around 45-65 mph. Goes away when you accelerate. Just recently it has been hesitating and missing out. Changed spark plugs, wires, and air filter. Any suggestions for either problem. 2003 4x4 V6 5 spd with 87000 miles.
SOURCE: hesitation at 40mph and 50 mph.
A pop and hesitation is likely a backfire. The hesitation around 40 and 50 would be in keeping with that theory. There are several reasons you might be getting backfires and hesitation. If your ECM is adjusting the engine to run too rich this could happen. Misfiring might be occuring. Timing could be out. But one of the most likely is a restricted exhaust, likely due to a plugged, damaged or worn out catalytic converter. In some cases the converter may be bad enough to be giving you some performance problems, but not yet quite bad enough to signal an error. A vacuum test can help confirm whether this is exhaust related.
SOURCE: Hesitation problem
try cleaning the inside of the MAF sensor and do the following procedure as well.
Here is the most common cause of surges and stalls at stops and low erratic idle speed and rough idle, it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.
SOURCE: Hesitation on takoff and on acceleration
it could be one of many things with that many miles on the vehicle. when if ever did you change the fuel pump last? both filter and pump may need to be changed. that's alot of miles remember that. the filter is under the hood on the drivers side mounted on the firewall. under the brake master cylinder. be careful to relieve the fuel pressure before changing it.
SOURCE: 2002 toyota echo
Either the sensor on the air filter needs to be cleaned. Easy. I've done it myself. Or one of the sensors, before and after the catalytic converter, needs to be changed. difficult.
autozone has a fre check they they can run on your car. They will givbe you a code, that code will then tell us what is throwing that check engine light.
Left me know what u find out so i can help more
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I have the same problem with whining between 1800-2000 rpm. I have an automatic. I can't tell about a hesitation. It may be there, but it has a pretty high stall, and it may not be noticable. Mine is a prerunner.
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