When I put it in 5th at 25 mph, the RPMs went down pretty low (under 2000) and the RPMs and the vehicle speed struggled a little to go up (as would be expected).
I used throttle body cleaner from Advance Auto to clean it, but I noticed after that it said to do it while the engine was warm - I did it while the car had been sitting overnight. It was enough to make the check engine light turn off, but I didn't notice any improvement with anything.
And okay, I'll try that. Sorry if this is a dumb question, but what are we testing by disconnecting the negative battery cable?
Thanks for your response.
Ok, so its not your clutch slipping.
By disconnecting the battery and draining all the system power by turning the headlights on and leaving it sit for several hours you reset the computer of the car. If it detected something wrong or a sensor was sending a bad signal but now its fine this will reset all the codes and stuff.
Im still not sure why you would be doing 4000rpm at 70mph, it should be around 3000. I would say that maybe somehow your shift linkage is messed up and the transmission is going into 4th when you put it in 5th but thats highly unlikely and you say you have no power.
What size do your tires say they are on the sidewall? (Ex. 195/70 R14)
Is it possible for you to try driving another 7th gen civic thats a manuel to see what the difference is? Either a friends or a test drive at a dealer just so you know whats normal for this car? Did it do this right from new?
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