GMC Sonoma not starting

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Posts: 2
Joined: Wed Mar 06, 2013 10:58 am

Noisy GMC Sonoma

Unread post by ajgolf18 » Wed Mar 06, 2013 11:17 am

My GMC Sonoma V6 makes a pffting noise when first started. Sound comes from engine compartment and varies with rpms. Goes away after a few minutes of driving/warmup. Sounds like exhaust leak at manifold or head gasket leak. No water in oil, no excess exhaust noise during driving.