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How do you check if a1990 Chevy 1500 5.7 liter v8 has plugged catalylict converter?
Wiki User
∙ 14y ago
You can hook a vacuum gauge to a direct vacuum source on the intake manifold. There's several vacuum ports on the intake. Gauge should read at idle 18 to 21 inches of vacuum, the higher the better. If it has real low readings like below 18 Then if you KNOW for sure there's nothing else wrong with the engine, then it's probley the converter.
If you want to KNOW for sure then take the exhaust loose on both sides of the engine and go drive it. If it run's good and you like it, then put a converter on it.
Wiki User
∙ 14y ago
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