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On a cold day, my car starts hard but it starts, the engine almost sputters, my husband seems to think that it might be a sensor, what is your opinion?
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try to give it a little more gas it sputters an back fires!
In the first place your not giving it more gas unless it running ! If just cranking all your doing is letting more air in . Your vehicle has electronic fuel injection , not a carbuerator . Till the computer see's a RPM over 300 rpm , it's going by programming installed in the PCM - engine computer . It sputters an back fires because of a lean condition , low fuel . When starting a fuel injection engine you don't touch the throttle pedal . And if you were to push it to the floor and hold it , the computer goes into clear flood mode. If the vehicle were flooded that is what you would want to do .
P0320 OBD II Trouble Code
You may have O2 sensor problem or a map sensor or coolant temp . sensor . Your best take it an have a qualifiedd repair shop diagnose it .
I am no Honda expert, but a similar problem happened to my ex sister in-laws Ford Taurus. The speed odometer would jump around and it had trouble shifting (automatic transmission). After driving it I changed out the speed odometer sensor on the transmission and it's been fine ever since. I changed out the sensor because if the cars computer cannot tell how fast the car is traveling then fail safes in place go into effect and the computer will do it's best to keep the cars rpm's down based on the speed indicator and not let it shift or shift properly either. If it's getting false speeds then it will shut down the motor when the speed gets to high and allow it to run as the speeds fall (jumping speed odometer needle). It effects the transmission shift points also. It will either shift erratically or not shift out of say 2nd gear, so that the cars engine can't get damaged based on what signal the speed sensor is sending the computer.
The thing to do is have the vehicle hooked up to diagnostic scan tool . Viewing engine sensor data ,see whats off . The computer may think the vehicle is warmer then it is an giving it less fuel . Checking coolant temp sensor data , IAT - intake air temp sensor . 048 Engine Hard to Start or No Start Scan Data for Starting Problems
P0138 O2 Sensor Circuit High Voltage P0139 O2 Sensor Circuit Slow Response P0420 Catalyst System Efficiency Below Threshold
First things to check and clean is the MAF sensor and the IAC valve...these two cause problems from carbon and dirt buildup...use MAF cleaner only....if this works, great, if not....
Clean trottle body....or
Check for a plugged catalytic converter...remove the O2 sensors and start the car, does it seem better? If it does change the catalyst..
Could be cam sensor, crank sensor, PCM going bad. On these newer vehicles with all the electronics it is hard to pinpoint what it is till the check engine light does come on for it. I would suspect one of the 3 going bad though.
Have u replaced the MAF sensor?, that is what this sounds like, when they fail they cause a severe loss of power but don't turn on the check engine light, a quick way to test it is to disconnect the sensor and idle the engine for a moment then drive it, if it runs better the sensor is the problem. Here is a photo.
sensor on top of cylinder head for the cold start ,with engine in front of you right side of head at the front there are two sensors ,cant remember if its the first one or the second one though
the p0171 code is for a fuel system lean code......possible causes are a cracked exhaust manifold.....bad o2 sensor...bad coolant temp sensor fuel pump.....lean fuel can cause the other codes you have for misfires
Your ECT (Engine Coolant Temp) sensor is bad. What's happening is at cold start it richens up the fuel mixture and as it warms up the ECM thinks it's still cold and essentially the "choke" is still on. Also check your coolant level. If you don't have enough coolant in you engine/radiator, the ECT doesn't know what to do so it thinks it's cold.
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