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GMC 1998 Sonoma Owner's Manual page 75

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If
the engine stalls and the SECURITY light flashes,
wait about 10 minutes until the light stops flashing
before trying to restart the engine. Remember to
release the key from the START position as soon as
the engine starts.
If the engine does not start after three (3) tries, the
vehicle needs service.
If you
are driving and the SECURITY light comes on,
you will be able to restart the engine if you turn the
engine off. However, your Passlock system is not
working properly and must be serviced by your dealer.
Your vehicle is not protected by Passlock at this time.
You may also want to check the fuse (see "Fuses
and Circuit Breakers" in the Index). See your dealer
for service.
If the SECURITY light flashes, wait until the light stops
flashing before starting the engine.
If the SECURITY light comes on while the engine is
running, a problem has been detected and the system
may need service. See your dealer for service.
In an emergency, call the GM Roadside Assistance
Center. See "Roadside Assistance" in the Index.
New Vehicle "Break-In"
NOTICE:
Your vehicle doesn't need an elaborate
"break-in." But it will perform better in the long
run if you follow these guidelines:
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Keep your speed at 55 mph
(88 km/h) or
less for the first 500 miles
(805
km).
Don't drive at any one speed
--
fast or
slow
--
for the first 500 miles (805 km).
Don't make full-throttle starts.
Avoid making hard stops for the first
200 miles (322 km) or so. During this time
your new brake linings aren't yet broken
in. Hard stops with new linings can mean
premature wear and earlier replacement.
Follow this breaking-in guideline every
time you get new brake linings.
Don't tow a trailer during break-in. See
"Towing a Trailer'' in the Index for more
information.
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