Reply to thread

Message: <blockquote data-quote="Mustang5L5" data-source="post: 1585740" data-attributes="member: 30520">The rubber fails and the outer ring slips on the inner ring.  However it usually vibrates at all RPMs, but not always.  Unfortunately no easy way to determine if the ring has slipped other than looking at a pic of one and trying to compare. But 5.0 vibrations at low RPM could be other things as well.  In my experience a misfire/dead cylinder presents as a low RPM vibration that clears up.    I had a dead injector on my Fox for about 9 months.  Car ran awesome but had a vibration under 1500 and would leave two black strips from the tires...on 7 cylinders.  Only reason It took me so long was because I just AOD-T5 swapped the car and thought the vibration was related to that. I'd start with ruling out a misfire.  The old OBD1 5.0's had a very crude misfire test called a cylinder balance test that you run during the code reading process.  It turns off one injector at a time and can sense the RPM drop.  It will tell you if one cylinder is dead or not  (how i found my issue).   A good code reader for the OBD1 cars is the Innova 3145 which you can get on amazon for about $40. You can also proactively ohm out the injectors by checking resistance values.  Should be about 14.4 ohms with a meter if you unplug them and test across the two connection prongs.   You can also use an IR gun, cold start the engine and see if all 8 are warming up evenly. There's also the question of condition of spark plug wires, cap/rotor, fuel filter and overall injector health as well.</blockquote>