1999 Acura TL Misfire

Tiny
BRADLEY_E_THOMAS
  • MEMBER
  • 1999 ACURA TL
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 148,000 MILES
I replaced my O2 (bank 1) sensor and a week later my vehicle began misfiring on all cylinders. I ran the codes and it said P0301, P0302, P0303, P0304, P0305, and P0306 - all cylinders misfiring - as well as the Multiple Misifre code of course. It also registered P1399 - Manufacturer Control Ignition System or Misfire - which is not an acura trouble code. I therefore replaced all my spark plugs, my EGR Valve, and one Coil Pack that had a hairline fracture. I cleaned my EGR Valve Ports using Sea Foam twice and used MAF Sensor cleaner to clean the MAP Sensor. The vehicle still registered P1399. Shortly after, P0305 registered followed by the remaining P030's. The vehicle feels like it's misfiring. My catalytic converter needs replaced soon. What can be the cause of the misfire? And what would cause the P1399 trouble code?
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Monday, December 29th, 2008 AT 8:41 AM

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Tiny
DAVE H
  • EXPERT
Check/clean/replace also check the wiring

CKP Sensor. Behind crankshaft pulley, attached to oil pump.
Crankshaft Position (CKP) Sensor
Sensor detects speed and position of crankshaft. Used for fuel injection timing and ignition timing.

Check freeze frame data. Perform PCM reset procedure and clear freeze frame data (if present) and DTC(s). See PCM RESET PROCEDURE/CLEARING CODES under SELF-DIAGNOSTIC SYSTEM. Exchange spark plug from suspect cylinder with one from another cylinder. Connect SCS service connector. See Fig. 1. Test drive vehicle several times in freeze frame data range. If there is no freeze frame data of misfiring, test drive vehicle under various conditions and try to duplicate malfunction. If DTCs P0301, P0302, P0303, P0304, P0305, P0306 or temporary DTC P1399 are set, go to next step. If DTCs P0301, P0302, P0303, P0304, P0305, P0306 or temporary DTC P1399 are not set, problem is intermittent, possibly due to fouling spark plug. Misfire is not detected at this time. If misfire follows spark plug to different cylinder, replace spark plug. If misfire remains in same cylinder, go to next step.
Exchange fuel injector from suspect cylinder with one from another cylinder. Let engine idle for 2 minutes. Test drive vehicle several times in freeze frame data range. If there is no freeze frame data of misfiring, test drive vehicle under various conditions and try to duplicate malfunction.
If DTC P0301, P0302, P0303, P0304, P0305 or P0306 is not indicated, misfire condition is not detected at this time. Possible intermittent fuel injector poor connection. If misfire follows injector to another cylinder, replace faulty fuel injector. If misfire remains in same cylinder check valve adjustment, cylinder leak down, engine compression and Crankshaft Position (CKP) sensor. Repair as necessary.
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Tuesday, December 30th, 2008 AT 8:15 AM

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