2004 Honda Accord slows uphill on highway

devonhansen_168212
Sun, 14 Jun 2020 19:29:45 +0000
Maintenance/Repairs

I have a 2004 Honda Accord 2.4L (K24) 4 door 5 speed Automatic trans, I’ve replaced various parts on my car and it still struggles to go uphill on the highway, (just saying I use Mobil1 full synthetic with good filters religiously)

When I’m going up a rather steep grade on the highway my cars RPM stays around 2250ish and the car just very slowly Decreases speed and it downshifts normally but even when it downshifts from 5th to 4th and my RPM’s jump up…my cars speed doesn’t drop anymore but more or less stays the same until I crest the hill, and sometimes just drops really slowly… what could this be? I’ve put tons of parts on my car and can’t figure it out…if I floor my car I can get it to climb better but I feel like I should def have more power especially after downshifting it should pickup speed not just stop slowing down confused
287 000kms (178 000miles)

I’ve replaced the fuel pump with brand new, air filters clean, new spark plugs properly gapped, both oxygen sensors and the entire exhaust from the exhaust manifold back(including cat) cam intake and exhaust sensors, vtec actuator and vtec solenoid,

9 posts - 7 participants