1987 Ford Bronco Normal PSI for cylinder compression test

1987 FORD BRONCO
130,000 MILES • V8 • 4WD • MANUAL
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AUSTIN1993
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The engine loops at idle speed.
What are the specifications for the cylinder compression?
Jul 8, 2009 at 10:09 AM
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BLACKOP555
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as long as its over 100 and the lowest cylinder is no more then 30% less then the highest.

i.e highest is 100 lowest has to be 70 or more.

i would suspect a vaccum leak causing your problem.

to check it spray the vaccum lines with brake cleaner and monitor the idle. if idle changes thers a leak. also spray the gaskets and air intake hose also
Aug 12, 2009 at 8:15 PM