I have a 98 Tahoe with 150,000 miles. When I accelerate from a dead stop I hear a ticking noise from under the vehicle. It is not present when idling or deccelerating. If I accelerate slowly the ticking is not present. Only when I give it a little more gas. Any insight would be most appreciated.

  • Are you able to narrow it down to suspension or engine noise? – rpmerf Jun 13 '16 at 13:32
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    Could be an exhaust manifold leak. – john D. Jun 13 '16 at 20:40
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    Could be a worn u-joint on the driveshaft. Do you also hear it when going up hills? – TMN Jun 14 '16 at 17:43

Pre-ignition , maybe. What octane gasoline is it supposed to take, and what are you putting in it? Pre-ignition generally ticks when you put the engine under load, especially going up a hill, or "putting your foot" in the gas pedal. If the car is supposed to be run with 91 or 93 octane fuel, and you're using 87 that could cause pre-ignition and a ticking noise.

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