1999 Honda Civic Misfiring

  • 1999 HONDA CIVIC
Engine Mechanical problem
1999 Honda Civic 4 cyl Front Wheel Drive Automatic

when I start up my car, the car idle very low and you can hear it wants to idle up but it chockes. You can hear the motor shakes, It does this for a few seconds then idles normal. And it does this only when the car is warm. Engine check light came on and the codes are P1399: Ignition System or Misfire P0300: Multiple Misfire Random P0303 Misfire detect, P0302 2 Misfire Detect. I have change the spark plugs and spark plugs wire, clean the fuel injectors and it still does this. Majority of the time its like that when its warm but sometime its fine. I dont know what to do from here can someone please tell me what I should check or do from here?
Do you
have the same problem?
Tuesday, October 13th, 2009 AT 2:11 AM

1 Reply

NOTE:If DTCs P0107, P0108, P0131, P0132, P0171, P0172, P0401 (D16Y5 engine), P0505, P1128, P1129, P1253 (B16A2, D16Y5 or D16Y8 engine), P1361, P1362, P1381, P1382, P1491 (D16Y5 engine), P1498 (D16Y5 engine), and/or P1508 are set with random misfire DTCs, trouble shoot DTCs P0300-P0304 last.

If misfiring is frequent enough to trigger detection of increased emission during 2 consecutive driving cycles, Malfunction Indicator Light (MIL) will illuminate, and DTC P0300 and some combination of P0301-P0304 will be stored in memory. If misfiring is frequent enough to damage catalyst, MIL will blink whenever misfiring occurs, and DTC P0300 and some combination of P0301-P0304 will be stored in memory. When misfiring stops, MIL will still remain on.

Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral until radiator fan comes on.
Allow engine to idle.
Test drive vehicle to verify symptom.
If misfire does not recur check for low fuel quality (inadequate octane level), low or no fuel, or carbon deposits on spark plugs.
Perform inspection and repair procedures in order listed according to symptom.
Random Misfire Occurs During Low RPM & Low Engine Load
Check for:
Idle air control valve
EGR system malfunction on D16Y5 engine.
Correct fuel pressure..
A Crankshaft Position (CKP) sensor malfunction.
Valves incorrectly adjusted.
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Tuesday, October 13th, 2009 AT 5:51 AM

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