Hesitation problems gone in cold weather? - 1
2012 Honda Civic LX, 180k miles.
First, can a transmission mount affect acceleration performance? I've been having hesitation issues (lack of acceleration power) in my Civic. The problem goes away almost completely in cold weather (anything below 35 degrees F). However in warm weather, my car struggles to accelerate quickly and it sounds kind of like it's growling.
I do believe I have a bad transmission mount due to a vibrating/rough idle that goes away whenever I shift to N or R. So I will get that replaced, but I'm not sure this can cause hesitation?
Does this sound like a dirty TB?
Fuel trims are normal. Thanks
Added (1). P.S. I'm doubtful it is the mount. I'm leaning towards a dirty TB or other air restriction since the cold/denser air pretty much gets rid of the problem (likely not vacuum leak due to normal fuel trims).
The cooler temps influence two sensors that have a big effect. The engine coolant temp sensor will run the engine much richer on start up, rich running is smoother, but once the engine warms up it shouldn't make any difference.
The other one is the intake air temp sensor, it does the same thing and also increases ignition advance when it sees cold air. One of the biggest scams out there's these supposed "performance chips" that simply ties into the air intake sensor with 10 cent resistor they sell for $60.
Before you start butchering your air intake sensor you need to know that just because the engine runs better when it's rich doesn't mean you should make it do that. Rich mixtures tend to mask the real problem which is almost always weak ignition. Don't check your spark plugs, just take them out and put them in the garbage, carefully install a new set of NGK plugs and when you're doing it make sure the coil extensions are not submersed in oil from failed valve cover gasket components.
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