1993 Chevrolet Van cruise control

DOKLUT

MEMBER
1993 CHEVROLET VAN
5.0L
V8
2WD
AUTOMATIC
82,000 MILES

Will not hold speed. Cuts out or starts to lose speed. Press on the gas and it will come back to speed and hold for a little while.

Saturday, June 13th, 2015 AT 3:57 PM

1 Reply

CARADIODOC

MECHANIC
33,752 POSTS

These symptoms are typical of a vacuum leak. Usually that is on the small vacuum hose going to the cruise control servo, but often that hose taps off the large hose feeding the power brake booster. If that's what you have, check that larger hose too for leaks and loose clamps. If everything looks okay, run a temporary vacuum hose straight from the intake manifold to the cruise control servo. (Cap any hose ends that are left open by doing that). If that solves the problem, suspect internal leakage inside the power brake booster.