I own a 1989 Honda Accord LXI 2.0 manual w/ 175k miles.
New plugs, Wires and oil change 3/20/2007

Synptoms:[*] Acceleration and power is fine before engine warms up to operating temp.[*]Loss of power noticeable after engine reaches operating temp.[*] Most noticeable between rpm range of 2000-3000 and in second and third
gear (during acceleration, power seems to flatten out at this rpm range, then gets strong again over 3k rpm).[/ol] I have heard about Honda's having this issue before but has anyone figured out a solution. I have considered a slightly faulty O2 sensor running the car lean, which would rob power. Does the O2 sensor perform differently or is the O2 sensor even being used before the engine warms up? This is why I suspect an O2 sensor rather than a fuel filter or weak fuel pump (I have not ruled them out yet).

Thanks for your replies.

 

The early 90's Honda's had a problem w/ EGR over-leaning some cylinders and causing a "flat-spot" or lag when trying to accelerate from around 1500-2000 rpm. Problem caused by one or more EGR ports being blocked and forcing excess EG into remaining open port/s. This overleaned the engine and caused the flat spot in accleration. If you have an EGR system, I would check that system since it is only enabled after engine reaches operating temperature. Fix is to clean all EGR passages, ports, and EGR valve.

The O2 sensor is a possibilty, although I've never heard of significant drivability problems from an O2 sensor. It may be possible.

Fuel pressure seems less likely. Usually, low fuel pressure will result in difficult or no start.

good luck

 

Thanks Texashonda. I'll check into that.