re Re: Hard-starting 1991 100s

["Smith, Kirby A" <kirby.a.smith@lmco.com>]

Eric Maxon <emaxon@megsinet.net> wrote:

Never rule out vaccuum leaks as the culprit-- When the car's hot, you
don't get the 80-150ma diff p reg current, and the cold start injector
only sprays for a brief second-- even a small vaccuum leak will have a
much greater effect on starting a hot motor.  I've found 3 NF engined
cars with the SAME leak-- very difficult to spot, usually easy to HEAR--
the L shaped 1/2" dia hose connecting the idle air regulator to the
intake manifold.  It usually splits or pinches shut along the long seam
UNDER the fold of the manifold.  Listen for hissing from that vicinity
and peek between the manifold runners to see if it's squashed flat w/
the engine running.  Come to think of it, that's the only serious
vaccuum leak I've found on 100's-- I guess the 100 fleet is still pretty
new by rubber rotting standards.  This hose is only about $17 list at
the dealership.
++++++++
I had the same problem on my NG engined 1988 90q

Kirby A. Smith   New Hampshire USA
1988 90q Titanium gray, 180 kmi
1988 90q Stone gray, 185 kmi - under construction
1988 90q Stone gray, 180 kmi - under destruction
1995 S6 Pearl effect, 80 kmi