[urq] 84 urq compression testing

[todd ward]

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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