Misfires On all Cylinders - Help

[kismetcapitan]

seems silly but how are your spark plugs? I recently had a misfire (although not everywhere like yours) and new plugs completely solved it. I have no idea why - the old plugs didn't show any unusual wear or coloration from rich/lean running, but it did, and I'm glad!

back to misfiring...I've always worked backwards to trace the problem - first plugs, then coilpacks, then air leaks. Three things can cause misfires - not enough spark, loss of intake charge boost/overfueling as a result, or spark is ok but air/fuel is boosted to the point where it blows out the spark.

[cruzanrs6]

seems silly but how are your spark plugs? I recently had a misfire (although not everywhere like yours) and new plugs completely solved it. I have no idea why - the old plugs didn't show any unusual wear or coloration from rich/lean running, but it did, and I'm glad!

back to misfiring...I've always worked backwards to trace the problem - first plugs, then coilpacks, then air leaks. Three things can cause misfires - not enough spark, loss of intake charge boost/overfueling as a result, or spark is ok but air/fuel is boosted to the point where it blows out the spark.

I did replace the plugs. So drove the car and warmed it up came back and did a scan. Fuel Trim Bank 1 and 2 showed up - system too lean. Did some measuring blocks; 001,002,003 091,092,093 (the ones in the 90 at idle and reved up).

[cruzanrs6]

So as I am looking at the measuring blocks (car running), I smell an odor and notice smoke coming from the drivers side fire wall/engine - could not exactly isolate it. Shut down car and now have another code:16534 Oxygen (Lambda) Sensor B2 S1 P0150 -008 Malfunction in circuit. Restart car - no more smoke still misfiring. Measuring block 2 now has a big difference at idle between Mass Air flow bank 1 vs 2 (5.78g/s : .67 g/s). Also observe the exhaust on drivers side muffler port is much cooler than the passenger side. Gregg is commenting that maybe the 02 sensor wire shorted out.