: 2000 STS - P 0300 - rough idle



eldoradogary
02-25-14, 03:15 AM
2000 sts has po300 code, no other codes. The car idles rough and runs rough. Today I tried full throttle in park in the driveway. So the car revs up and goes then sputters out then revs good again, same scenario over and over, 1-2 second intervals between running good and then sputtering. I'm thinking coil pack or injectors. Wouldn't a bad coil or injector throw a code? Any input appreciated.

Submariner409
02-25-14, 10:09 AM
The engine has a rev limiter set at 4,000 rpm in N or P to stop you from trying to over-rev it under no load. When not in some gear it will bump the limiter, slow down, restart, slow down all day - about 4000 rpm.

For a P 0300 - The usual diagnostics - plugs, coil (cassettes), connections, injectors, connections, fuel pressure checks, intake tract air leaks, PCV system and vacuum leaks. Complete code pull.

Ranger
02-25-14, 10:58 AM
:yeah:


Today I tried full throttle in park in the driveway.
:tisk: