<VV> Power problem GM - Not Corvair

[N6nev at aol.com]

Measure the vacuum at idle and then raise the rpm to 2500.  the  reading 
should be within 1" , If the reading drops as you raise the rpm the  exhaust 
is restricted  , most times, its the cat.  Larry
 
 
In a message dated 4/17/2009 10:13:10 A.M. Pacific Daylight Time,  
nicolcs at aol.com writes:

I had a  similar problem with my GMC motorhome. After many false leads, I
finally  found that the metering rods in the Quadrajet were stuck in the  
down
position. A carburetor rebuild fixed it. I thought I had a fuel  delivery
problem but then I noticed that if I floored the accelerator and  opened the
secondaries, it would go; obviously not a pump/filter  problem.  The cat is 
a
good possibility too (if you have one).  Normally, a mechanic checks the 
back
pressure at 2500 rpm using a gauge  installed where the O2 sensor goes. 
Since
you don't have an O2 sensor, you  have to use a vacuum gauge.  Look for a
steady drop in vacuum with the  engine held at a constant 2500-3000 rpm -
indicating increasing  backpressure from a plugged cat.

Craig  Nicol

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