Re: Another FNG - 2001 GMC Savana
Ok, good info. It's hard to determine the scope of the knock on my laptop speakers.
With the engine running, is the knock sound coming from the top or the bottom of the motor? You'll have to stick your head under the van while running to check the bottom sound.
Oil pressure is normal, has a bunch of ABS codes (how important is ABS to you?) and has a misfire that is not detectable while driving. Heated O2 sensor failed. A heated O2 sensor is an easy fix and cheap.
The knock could be several things......if it's on the top of the motor, tappet/lifter/etc. Sounds like the knock is being sensed by the knock sensor, as it would be.
Since you have a distributor, no coil over plug stuff.
We had a rod knock in a trooper and it sounded like a midget with a baseball bat was in the block. It was loud.
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