Hey guys. I own a 1992 Honda Civic LX 4 door.

The car is used on pizza delivery, so a lot of stop and go, shut off-starting. It will run fine for several runs and then ill start it up, and it will puff a bit of smoke. Throttle response has to be very gentle for the RPM to go up, or the car will stall, it feels like the car is given too much gas. Then the throttle response will get better, but if u stomp it, it'll bog down. At the same time the IDLE will be high, at around 1500RPM and the gas consumption suffers. It will run like that for a while, the check engine light will come on after some time, usually when the car is at a high steady speed (highway), and then it runs fine... or not. When the car is shut off and started again, it can run perfectly... or it'll do the same.

I checked the codes and it gave me this:

1-Oxygen sensor
6-Water Temperature Sensor
7-Throttle position sensor
10-Intake air Temperature sensor
43-Fuel supply system


I know that one of those could thrown all those codes. I just don't know from which one to start... For sure, the TPS will have to be changed, because it does not affect the other. But everything else is related! I'm looking for advice from people who knows how civic behave. I'm a mechanic myself, and i just don't seem to get it.

 

Whenever you have more than one code, make note of them then clear the ECU and test drive until CEL comes on again. Work on the code that is first to reoccur first.

Someone may have plugged the sensors in wrong. Most of the plugs for stuff on the manifold are the same type of plug and can be connected to the wrong thing. In particular TPS can be interchanged with MAP (if it's throttle body mounted) and IAT interchanged with the purge control solenoid.

You can check the TPS with a voltmeter.

 

I think my map is mounted on the firewall. Its a 1.5L civic d15. I rebuilt the engine last summer myself at mechanic school. After the rebuilt, it ran fine without any codes. Then closer to winter, it started giving mini-symptoms but i ignored it. lol

My CEL isn't always on.. It only comes on, sometimes, when i drive at steady high speeds like on a highway. The light doesn't come on at start up, and when its on, i can just turn the ignition off and then on while the car is rolling and the CEL will clear itself. But the codes are still stored in the ECU