Backfire. Saturn VUE

For 1990-2009 cars only

Makes 🢒 Saturn 🢒 2004 🢒 VUE - AWD 🢒 Engine 🢒 Engine Controls - 3.5L (L66) 🢒 Backfire

Checks

Action

DEFINITION: The fuel ignites in the intake manifold, or in the exhaust system, making a loud popping noise.

Preliminary Check

•	Refer to Diagnostic System Check - Engine Controls .

•	Refer to Symptoms - Engine Controls .

Ignition System Checks

•	Check for the proper ignition coil output voltage with a J 26792 Spark Tester or equivalent.

•	Inspect the spark plugs for correct operation and good ignition system performance. Refer to Spark Plug Inspection .

•	Inspect the ignition coil boots for damage.

Engine Mechanical Checks

•	Check for any of the following engine mechanical problems:

-	Any broken or weak valve springs

-	A low compression

-	Any sticking or leaking valves

-	An incorrect valve timing

-	An incorrect or worn camshaft

-	Refer to Symptoms - Engine Mechanical in Engine Mechanical--3.5L.

•	Check the intake and the exhaust system for casting flash or other restrictions.