The Check Engine MIL may be illuminated along with DTCs P0171 (Fuel Trim System Lean Bank 1) and/or P0174 (Fuel Trim System Lean Bank 2) set in the Engine Control Module (ECM) on some 2012-2019 Enclave, Traverse; 2012-2017 Acadia; 2015-2019 XTS, Impala; 2015-2016 Colorado, Canyon; and 2015-2017 Equinox and Terrain models equipped with the 3.6L V6 engine (RPO LLT, LFY, LFX). Learn how to interpret CB talk here. hardlymoving from Memphis, TN on May 19, 2020: Easy way to find a vacuum leak is to spray fog around the vacuum lines and air intake areas with a brake clean aerosol spray. I let the car idle for a hour. When going down from speed for a light or stop sign, no matter the rate of de-acceleration, do not have and tendencies of a stall like they describe. You still need to diagnose the problem to check where it's coming from. Heating and cooling over time will cause those bolts to loosen. You do still need to follow the tool operating instructions, however, and the repair manual troubleshooting steps. Then check for intake gasket leaks. In severe cases of coolant leaks, parts of the manifold are wet with coolant, or puddles of coolant are present. He said the is no spark after it stalls. I wish I could be more specific. By Jason Van Wyhe. Set your car to park or idle to check for leaks in the intake manifold. (Fig. Search for any indications of cracks along the manifold's exterior. It'll be more accurate. Block the wheels to be safer and prevent the vehicle from moving. Throttle body and intake manifld gaskets can develop leaks as well. Dan Ferrell writes about do-it-yourself car maintenance and repair. Pinch the vacuum line leading to the device, and spray soapy water on it and hear for a change in idle speed. ? Always replace a vacuum hose with one of the same diameter and length, and for the application intended (PCV, brake booster, or regular vacuum). If you set your intake manifold on the bench in front of you with the carb side down, you just put the shims on first then put your bands on (and in my case, … I have a 2010 GMC Terrain literate 140K. Do you feel the transmission suddenly changing gears? Another source is your vehicle repair manual. The fewer connectors, adapters, and hoses you use to connect your hand pump to the device you want to test, the better. At start up and at cold or hot idle, all seems ok. Driving, at any speed or gear (Auto tans) there is a surge or pulsing in engine RPM’s. 18,000 miles later issue has not gotten better nor worse but has yet to throw a code. I have a 2002 Saturn S series sedan 3rd generation SOHC. If you don't have the diagram, check each vacuum hose as you go around the engine. You can drive for a few minutes until the component's temperature rises and the (broken) coil opens and the car stalls. Follow the instructions that come with the tool and the tips included in the post linked above. . Want to save on an expensive car bill? The less-common item is a cracked vacuum hose. High idle or very low idle, depending on vehicle model. All he could find is one small vacuum leak. For example, a bad EGR valve, bad compression, or ignition timing problems may cause one or more of these symptoms as well. If the engine rpm's rise after spraying the brake clean on or around the hose or intake component, you've found your leak. Tighten the bolts gradually, following a crisscross pattern—when tightening a manifold, start at the center and work your way out. After making a repair, route and secure the vacuum hose away from hot surfaces and moving components. All it does is keep the clamp from moving. (Note: If you are trying to find a potential vacuum leak because of a trouble code you retrieved after your Check Engine Light came on, your car computer may be adjusting the air/fuel ratio to compensate; so the engine might not sound as if it had a performance problem. Then you could be driving and all of a sudden experience a stalled engine. Is there any chance I could have success using a spray type gasket sealant (such as Permatex High Tack Spray-a-gasket sealant) to "fix" a small vacuum leak with my intake manifold gasket? There are a lot of places where a vac leak can occur but this one seems to stump people. So this problem seems to plague a lot of 2004 - 2007 Vulcan engines. If leaking, you may hear a hissing sound. If there's a leak, you'll hear a hissing sound. He has certifications in automation and control technology. Dan Ferrell (author) on January 07, 2019: It sounds more like an idle control (IAC) actuator or ignition system, sticking EGR valve problem. 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