Shakes when idle, smooths out while driving, thunking sound when shifting, no code. Here’s a good YouTube video on how to do it. Between the MAF sensor and throttle body (some vehicles only use a MAP sensor)ĭiagnosing a vacuum leak can be tricky.Here are some frequent vacuum leak locations: If unmetered air (air that enters that didn’t pass through the MAF sensor) enters the engine, it will cause your vehicle to shake when idle. The PCM knows precisely how much air enters the engine due to data from the MAF or MAP sensors. Your Traverse’s engine creates a vacuum when running. You may hear a whining or whistling sound. It may appear with P0171 (fuel trim lean) or no code. Here’s a great video on how to diagnose faulty plug wires with a multimeter. Spark Plug Wires– While only some models and engine combinations of vehicles today come with spark plug wires (a lot are now coil-on plug), if your Traverse happens to have them, they can go bad and cause a rough idle.Your Traverse will be running rougher at any RPM, but a misfire will be most pronounced at idle. If a coil pack goes bad, it’ll cause a misfire and rough idle condition. They are fired by the PCM (powertrain control module) at precisely the right time to provide the optimal ignition timing. Coil Packs– Nearly all model years and engines use coil packs.This page has a great chart to compare your spark plug condition to new ones. Although most modern vehicles use iridium spark plugs, they need changing at Chevy’s recommended intervals. Spark Plugs– The spark plugs are one of the most common causes (if not the most common reason that your Traverse may have vibrations and shaking).Here are the main components of the ignition system, as well as what would cause them to make your Traverse shake when idling. If your Traverse isn’t getting a good spark it will shake as it misfires and tries to stay running. The ignition system is responsible for burning the air-fuel mixture that enters the combustion chamber. You’ll likely get a misfire code, such as P0300 or P030X (X being the misfiring cylinder number. Ignition Misfire The spark plug to the left was bad enough to cause a bad backfire and threw the P0301 trouble code, which indicated cylinder 1 had the misfire The engine will vibrate, but it’ll otherwise run fine.Ĭauses 1. Rough idle, decreased MPG, potential slapping sound.Ī rich A/F mixture will usually lead to black or blue exhaust. You should hear a slamming noise when shifting or letting off the gas. Noticeable misfiring sound, lack of power, and MPG may suffer. When relevant, we’ve listed the applicable code in the “causes” section below. ![]() With these diagnostic codes, you’ll know which sensor is reporting a problem, which will narrow down your list of problems. You can get an OBD II code scanner cheaply, or most auto parts stores provide a complimentary scan. Before trying to figure out what is causing your Traverse to feel like a washer full of towels, make sure the check engine light isn’t on. There are a lot of reasons why your Traverse may shake when idle. The most common reasons a vehicle shakes when idling is a misfire or bad motor mount.Ĭhevy Traverse Shaking When Idling Diagnosis Check for Codes We’ve lined out some of the most common causes below. If your Traverse has this problem, many issues can cause it. It can be very jarring when your Chevy Traverse shakes when idle.
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