View Full Version : sporadic engine knocking

96 190
05-05-2013, 11:56 AM
2005 X9. so at idle, it seems to miss a bit, with a slight knock when it does. it will rev up fine in neutral, with no knock. but at idle it has a slight miss and a knock about every 3 seconds. when accelerating, it knocks sporadically. when cruising on a plane, it seems fine until you give it more gas, then the sporadic knock. I know what pinging sounds like; this isn't that. any ideas?

96 190
05-05-2013, 01:32 PM
actually, i need to add to this. the "knock" that i am describing at idle might be described as more like 'thunk'; when kneeling next to the engine you can physically feel it, like something is hitting the engine. every 2-3 seconds.

96 190
05-05-2013, 03:31 PM
okay, found the prob and posting it for whomever may be trying to diagnose same symptoms. my "helper" (i will refrain from other adjectives) put the new distributor cap on and had the 3 and the 6 on the wrong terminals. switched them to proper- runs great.