Vacuum leak?

Asked by Jan 16, 2017 at 05:35 PM about the 1996 Chevrolet C/K 1500 Silverado Extended Cab SB

Question type: Maintenance & Repair

Having trouble when switching from vent to defrost
to floor. Any switching from one to another only
happens when I let off the pedal then I hear the
clunk when the doors move with a surge of
vacuum. It also idles rough but fine when driving.
Sometimes the engine surges after starting when
engine is still hot from normal driving. Once going
again it stops. Have replaced idle control sensor
with no change in symptoms. Gas vapor purge
system is all good.  Brake booster and vacuum line
good. Can't find a vacuum accumulator or any
other vacuum lines to inspect for damage. Any
help will appreciated.

1 Answer

7,145

It does sound like a vacuum leak. Try spraying quick start around the intake manifold, you may have a leaky intake gasket or loose bolt. If it checks out good, disconnect one hose at a time from intake manifold instead of chasing hoses away from engine and see if you find the one feeding the problem area

Your Answer

Add photo

Related Questions

  • Vacuum leak? 1 answer

    Having trouble when switching from vent to defrost to floor. Any switching from one to another only happens when I let off the pedal then I hear the clunk when the doors move with a surge of vacuu...

    1996 Chevrolet C/K 1500 Silverado Extended Cab SB

    -

    Maintenance & Repair

  • Oil leak bad 1 answer

    I got a 96 Chevy Silverado 1500 with a 4.3 Vortec and I have a bad oil leak and I cannot figure out where the oil is coming from and my pressure in the radiator water pressure I guess you'd say is ...

    1996 Chevrolet C/K 1500 Silverado Standard Cab SB

    -

    Maintenance & Repair

  • vacuum leak on 1998 /camaro 6 answers

    Chk engine light came on - dealer indicated it was a vacuum leak and traced it back to the gas tank - said the tank need to be replaced bacuase they couldn't pinpoint the location of the leak. Car is...

    1998 Chevrolet Camaro

    -

    Maintenance & Repair

  • Water leak 1 answer

    I have put new gaskets and had heads checked and they are good but still blows water out exhaust what else could it be

    1992 Chevrolet C/K 1500 Standard Cab SB

    -

    Maintenance & Repair

  • oil leak 2 answers

    I got a 90 chevy half ton with a manual transmission. Oil seems to be covering the starter, and the slave cylinder. Any ideas? let me know.

    1990 Chevrolet C/K 1500

    -

    Maintenance & Repair

Search Chevrolet C/K 1500 Questions

Chevrolet C/K 1500 Experts

#1 Andrew Olsen
Andrew Olsen
Reputation 3,550
#2 John Saffrahn
John Saffrahn
Reputation 2,550
#3 Rowefast
Rowefast
Reputation 2,150
View All

Related Models For Sale

Used GMC Sierra 1500
783 Great Deals out of 67,904 listings starting at $1,699
Used Ford F-150
2,204 Great Deals out of 180,758 listings starting at $1,500
Used Chevrolet C/K 2500
192 listings starting at $6,499
Used Dodge Ram 1500
403 Great Deals out of 10,670 listings starting at $1,500
Used Chevrolet Tahoe
610 Great Deals out of 35,916 listings starting at $1,000
Used Toyota Tacoma
551 Great Deals out of 41,654 listings starting at $2,999
Used Chevrolet Camaro
418 Great Deals out of 31,646 listings starting at $2,395
Used Chevrolet S-10
8 Great Deals out of 1,263 listings starting at $999
Used Chevrolet C/K 3500
233 listings starting at $4,597

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.