[urq] 84 urq compression testing

[Bill Bennett]

Todd, unplug the black wires wires at the coil (15) that will disable the fuel pump and you will have no spark either, check compression cranking for ten cycles just use your foot to hold the throttle open, this way you will not have to ground anything. Umm Todd
  ----- Original Message ----- 
  From: todd ward 
  To: urq at audifans.com 
  Sent: Thursday, April 22, 2004 6:08 PM
  Subject: [urq] 84 urq compression testing


  Just checking procedures for compression testing my 84
  urq. Bentley says to remove all plugs after car
  reaches normal operating temp. Then disconnect hot
  wire at distributor cap and ground it out with a
  clamp. Open the throttle. Nominal pressure 102-131 psi
  Minimum of 73 psi with a max difference of 29 psi.
  Question: where should I ground the igntn wire? And
  how should I hold the throttle open? Should only need
  4-5 cranks until gauge will not rise any further
  right? My car would not pass emission so I took it to
  a shop where they did a compression and leak down
  test. It showed low compression and leakage of 70% in
  cylinder #1 and 85% in the rest. But the car seems to
  run fine. Its got a boost controller and probably some
  other mods I don't know about yet and smells like its
  running rich. But I just took it on a 600 mile trip
  and got 20-21 mpg running 80 most of the way. And the
  car has less than 80k on it. I don't think the shop
  would lie but it runs to smoothly for me to think it
  needs a 2-4k top end rebuild. No cutting out and pulls
  very well in high rpm 4-5k range. What would leakage
  like this show up as in every day driving? I was
  thinking the failure had come from a bad O2 sensor and
  maybe the mods dumping in too much fuel not bad
  valves. Know anybody in St. Louis? Thanks Todd




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