brianpack01 said:
(99 DII) Ok...I posted earlier about an odd idle and a type of knocking. I was told to check all hoses, etc to make sure there were no loose ends....done. Everything was fine. I wanted to also look at the possibility of replacing the 02 sensors but I didn't want to if it really wasn't the problem. Could it be a dirty stepper motor? Any other suggestions? Thanks guys.
need a bit more information. does the problem show during initial warm up ( open loop/closed loop)? After long trips at constant RPM? Are you having any other drivability problems? As already mentioned, one of the most common, simplest causes for a lean condition and rough idle is a vacuum leak. I know you said you checked everything. However, to be certain, disconnect each vacuum line at the MANIFOLD (one at a time) and plug the hole with your finger. If idle improves, the problem is with that line, if it doesn't improve, keep going. Its never a bad idea to double check. I'm stressing this because usually if you're suffering a lean condition, other components have failed and will throw their own MIL (i.e. injectors not firing, which will also throw a lean misfire code, in addition to you feeling the miss during driving). 02 senors could be a possibility, however, 02 sensors do not come into play until you've entered closed loop. So if you have this problem during warm up, its a safe assurance to say its not your 02 sensors (plus they'd throw a MIL). So go over everything one last time, inspect other simple things you may have missed, like plug wires & plugs.
