"ssss" noise by firewall- drivers' side under hood

Asked by Nov 24, 2015 at 03:16 PM about the GMC Jimmy

Question type: Maintenance & Repair

4 Answers

285

Does the noise change with speed? change with engine rpm? when braking?

1 of 1 people found this helpful.
7,745

is the brake petal "squishy"

1 of 1 people found this helpful.
64,715

I suspect a vacuum leak. Check for loose or damaged vacuum lines.

2 of 2 people found this helpful.
285

anyways does it make the noise just sitting still with the engine running and the vehicle not moving?

1 of 1 people found this helpful.

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