I'm having trouble with my 02 civic with misfiring. I'm getting a random misfire code, and misfire on cylinder 1,2,3,4 codes. Also getting a knock sensor code and a crank position sensor code... When the car is cold it runs like crap, really rough and if I give it gas it chokes and sometimes dies too. If I let it idle for 10 or so minutes till it warms up, it runs fine. I just did the timing belt and water pump and crank seal, I went by the book but maybe I screwed something up. Can anyone point me in the right direction? Thanks

 

-Look for pinched wires and loose connections.

-The thing with those two sensors is when you mess with them sometimes they go bad. Which would definitely cause a mis-fire. Get the book back out and troubleshoot the knock sensor first as it's way easier to get to (above the oil filter).

-It's also pretty common to not fully connect the crank sensor (behind the lower timing cover).

 

Will def. check those, but why would the problem be so exaggerated when the car is cold?

 

Car gets warm and the metal expands pushing the connections together. When cold they're just far enough away to lose contact.

 

Anyone know where I can get the specs to troubleshoot the knock sensor?

 

Knock Sensor Circuit Malfunction

1. Reset the ECU (remove fuse #6 from the fuse box under the hood, or disconnect the battery. Wait a minute before reinstall / reconnect)

2. Start the engine. Hold it at 3,000 RPM until the radiator fan comes on, then let it idle.

3. Hold the engine at 3,000 - 4,000 RPM for at least 10 seconds.

Is DTC P0325 indicated?

Yes - Go to step 4
No - Intermittent failure. Check for poor connections or loose terminals at the knock sensor and/or ECU

4. Turn the ignition OFF.

5. Disconnect the knock sensor.

6. Turn the ignition switch ON (II)

7. Measure the voltage between terminal 1 (red/blue wire) of the knock sensor and a ground.

Is there about 5 volts?

Yes - Go to step 12
No - Go to step 8

8. Measure the voltage between ECU connector A9 (red/blue wire) and a ground.

Wire side of female terminals

Is there about 5 volts?

Yes - Repair open in the wire between ECU terminal A9 and the knock sensor.
No - Go to step 9

9. Turn the ignition switch OFF

10. Disconnect ECU connector A (31 pin) from the ECU.

11. Check for continuity between ECU terminal A9 and a ground.

Is there continuity?

Yes - Repair short in the wire between ECU terminal A9 and the knock sensor.
No - Swap the ECU (with matching key) and recheck. If the problem goes away, the ECU was the culprit.

12. Swap the knock sensor with a new one and recheck.

Is DTC P0325 indicated?

Yes - Swap the ECU (with matching key) and recheck. If the goes away, the ECU was the culprit.
No - Replace the knock sensor.

 

Thanks for all the help guys, I figured out the knock sensor issue. When I went to trouble shoot it I found that the plug was really dirty and covered in oil (I guess it happened when I took the head off because the cars not wasting oil). Anyway I cleaned the plug and check engine went away. Now it just threw another light today while driving, so when I get home I'll check to see what the issue with that. Thanks again