I 2005 Envoy is lunging forward idling high when I stop and has a hissing sound under the hood what could this be

10

Asked by Feb 21, 2019 at 05:32 PM about the 2005 GMC Envoy

Question type: Maintenance & Repair

My 2005 Envoy is idling high making a hissing
sound under the HUD and lunging forward

3 Answers

2,915

Only hissing that I know of comes from not hooking the tube back up under the plastic resonator on top of the engine. See attached pic. Check your vacuum line attached to the brake booster too.

1 people found this helpful.
10

Thank you so much I'm a 62 year old woman on I do not want to get ripped off by any mechanic I really appreciate your information. it seems to be blowing air out on the opposite side by where the fuse boxes

1 people found this helpful.
2,915

Well, there is a PCV hose on the opposite side above the intake, could it be hissing from here in the picutre. If it's that side, could be this hose, or a severe intake leak, or brake booster hose not reconnected.

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