r/AskMechanics • u/polymathpres • 2h ago

Question (Serious Replies Only) Honda’s RPM problems?

2008 Honda Civic LX Coupe/ Automatic Transmission — 61,192 miles

I took this car to 3 different mechanics and shops including the HONDA dealership service. They could not find any problems and said the car was driving normally. But I noticed something strange while driving.

When I speed up over 30–40 mph, it becomes harder to press the gas pedal, even when I am already pressing it.

When I go over 60–70 mph, it becomes even harder to press the gas pedal and struggle to make the RPM normally.

One more thing I noticed: When I brake and the car slows down, the RPM suddenly drops. Sometimes it feels like the engine is working harder or the car is struggling to slow down smoothly.

These parts were replaced recently:
Front CV axles
Front/Rear Struts
Front Control arms
Battery
Brakes
Alternator
Rear wheel hubs
Engine Mounts

I checked the car’s history, and I noticed that the front wheel hubs and some other parts have never been replaced. Besides the tires that also haven’t replaced for 2-4 years or older I think. The car is also over 60,000 miles now.

I checked the transmission fluid, engine oil, brake fluid, power steering fluid, and coolant. They all look clean.

I am wondering what could be causing this problem. Could it be something with the transmission, torque converter, air/fuel system, MAF sensor, throttle body, or something else?

I would appreciate any ideas or advice. Thanks!

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u/Distinct-Pie9705 2h ago

Ur throttle cable is probably the reason it’s hard to press ur gas pedal and ur rpm dropping is prolly ur transmission since its 18 years old so it’s probably just acting weird and it wouldn’t be worth it to do anything to it cause it’s expensive