Scotty, I'm in dire need of help. I can't really afford to take my car to a mechanic, single mom barely making ends meet. I have a 07 honda fit in the last few months since it's been getting colder here in Kentucky I've noticed that if I don't let the engine warm up it will stall and die at stops when in drive or reverse, I've also noticed that my idle RPMs are lower then normal, and sometimes the RPMs run higher than normal while driving. I've looked and looked for answers but have come up confused with everything I've read. Do I just need to change my spark plugs and coil packs, or is it a more complicated situation? I've been fixing my car on my own since I first learned to drive. Grew up with the motto "If you can't afford to pay someone else to do it, learn to do it yourself." If you can help me narrow down the list that I've been told is a hundred and one different issues I'd greatly appreciate it, this issue is progressively getting worse. I rely on my car for work, I do uber and Lyft for a living so having my car go down means I'm out of work and eventually out of home.
I don't even know how to remove the throttle body, and don't trust myself doing so. I don't want to mess my car up more then it already is
I've had it checked for leaks, none present, not even a little oil leak. the only code it throws is a P0420, which I can understand why because the heat shield on my Catalytic converter has one side hanging by a thread and happens to be the side my o2 sensor is connected too. I've checked all the spark plugs and they are good. plus they're not even 6 months old. I've been told IAVC but my car doesn't have that. I've also been told to check the maf sensor, cold air injector, among many other things.
Check the air filter and at least a couple of the spark plugs. Change them if they are bad. For the spark plugs use the same brand and type of plugs it came with originally. I have done this on a FiT and it takes a few tools and a little patience but it is definitely do-able by a DIY person like yourself. If the car has a Mass Air Flow sensor, clean that (cheap and easy). Check the transmission fluid for the rpms running high, but it might be that you have a vacuum leak and/or that you need to clean the throttle body. Usually vacuum leaks cause lots of idle/rpm problems. Here are some videos that may help. https://www.youtube.com/watch?v=zMok2y05jNE&vl=en https://www.youtube.com/watch?v=eQpPcdvSBks&vl=en