1990 Civic 1.5

Ok so I replaced the spark plugs, wires, and dist cap, and the car ran great. I adjusted the valves once when the car wasn't cold, then I realized I made a mistake and adjusted them again the next morning when the car was cold. The car ran good, but then I noticed a problem.

The car would (and stil does) run great when you first start it up and its cold, I can cruise around at 1k rpm if I want to. As soon as it warms up, the car barely be driveable under 3k rpm. It acts like it's misfiring or something. It will buck pretty bad. I cleaned out the intake and stuff with some carb cleaner, nothing. Changed the o2 sensor, nothing.

I tried to find a second o2 sensor on my car... I can't find it anywhere. What could be causing this problem? I checked all the spark plug wires and made sure they were secure, they are. Could it be the dizzy cap??? Any help would be great thanks!

 

Is it a swap or original motor? Throwing any codes?

 

Original motor. Approx 235k on the clock. Before I changed the o2 sensor it would throw a code on the freeway when it was kinda cold... never could find out what it was because each time I turned the car off it would go away and not come back. Since I changed the sensor I haven't seen a code once

 

Pull up the carpet on the passenger footwell, take a look at the ECU. Its probably still flashing a code, but your CEL won't light up. That happens a lot.

 

ok i pulled up the carpet and checked the code. it blinks once, and repeats every 2-3 seconds. looks to be a code #1 which is oxygen sensor #1...

I only have one o2 sensor on this car right? I just replaced the sensor in the header.

 

maybe clogged cat???? Just taking a wild guess.