Diagnosing a Misfire in a Toyota Sienna Van

Ep. 27 Snale Racing Diagnoses a Misfiring Toyota Sienna Van

The Space Van, a 2007 Toyota Sienna, has been throwing occasional misfire codes since we got it. There were so many other things wrong with this car that could have been causing it. Over the last year, gnob has fixed most of them, but still the misfire would come and go. This week, though, it finally threw a hard enough code that it became undriveable. Watch as gnob troubleshoots and FINALLY finds the culprit, a faulty spark plug.

00:00 Symptoms and history
01:25 Steps for initial teardown
02:37 Removing the plenum
03:55 Diagnosis
04:37 How to reinstall plenum
05:42 Reassembled with bad plug moved to front bank
06:36 Bench testing of good and bad plug
07:42 Installation of new plug
08:21 Scan tool analysis