<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue-Light, Helvetica Neue Light, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">(That's "r e V V i n g", not "rewing")</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">At muffler shop to get a new, garage-made tail pipe welded onto muffler damper, an assistant got the job to drive my 71 (73 engine) T-III Std FI from lot onto the lift. First thing he did was to rev the engine far above where it's ever gone. Soot flew from the damper.</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">Boss, seeing that, told him to let me do it. After the job was done, on the way home, the car was hesitating...a few times barely able to accelerate. I had to rev somewhat to get it going.</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"> There were no flickering oil or gen lights (except a little with oil light six miles later), and idling was steady. It never stalled.</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">Question is: What can get messed up, or put over the edge, by doing such a hard idle? Where to look for what?</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">Mechanic pal said maybe fuel filter (so I put in a good one) and maybe vacuum hoses. But, outside of Pressure Sensor hose (which seemed fine), what vacuum hoses ARE there?</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">Just to eliminate other things I checked in distributor for point gap or whatnot. Found that the spring contact pin in center of distributor cap was gone. Spring was still there but not sticking out. The pin was easy to find on top of the plate. How the heck was the car able to go seven miles...although with the hesitation...with that pin missing and maybe making all kinds of strange contacts with points etc?</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">Is THAT a symptom of over hard revving? I, and my pal VW mechanic (not old ones any more), never saw that pin go missing, ever.</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">With re-set points (they were very slightly off) and "new" cap, and "new" filter, the hesitation problem improved, but not entirely.</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr">Plan is to next replace the entire distributor with one of my better spares, and clean the spark plugs. Anything else advised?</div><div id="yui_3_16_0_1_1413400786215_27809" dir="ltr"><br></div></div></body></html>