My 93 accord starts to bog or become sluggish after driving in it for 30-40 min. After the cel comes on it drives fine. I got code 43 fuel supply, I checked fuel pressure and it had 40psi, new fuel filter, new spark plug well seals, cleaned the injectors and re-placed the injector seals, has a new fuel pump. Any ideas on what the issue can be and how to fix it ?

 

A failing oxygen sensor can cause that sluggishness by causing the IACV to mix too much or too little air into the air/fuel mix. When it happened to mine, I did not get a code at all. But I think I got a 43 months before that and did not know what it was. If your O2 sensor is original, or very old, it should be on your suspect list.

You should also make sure the EGR valve is functioning properly. It can cause some sluggishness at certain RPM's, but the O2 sensor causes much more serious sluggishness. Mine was barely drivable by the time I figured out the cause.

 

Could it also be that one of the injectors stays closed for a while?

 

It is probably the oxygen sensor. If the Check Engine Light is on, with code 43 and there is poor drivability, then it may be due to a fuel supply issue. You are not experiencing poor drivability when the light comes on.

See this other thread: https://honda-tech.com/forums/honda-...ystem-3211349/

 

Okay thanks, I'll try that now and if problem cont. I'll be back with an update

 

try this first, clear the code, then disconnect the connector for the oxygen sensor so that it throws a code when the car warms up, see if it drives better, if it drives better then it's more likely the oxygen sensor that's bad

it's very important to let it warm up before pulling the connector

it's very important to check if the existing oxygen sensor is fouled black, this is an important thing to note

 

It was a bad o2 sensor, thanks for all the info and support