HOW DO I DO A VACUM CHECK ON MY 1998 CHEV TAHOE WITH A 5.7 V8 VORTED ENGINE? WHERE DO I SCEW IN THE TEST GAUGE? WHAT SHOULD THE VACUM BE?
Dec 2, 2006 at 10:05 AM
1998 Chevrolet Tahoe Vacuum Check
CHEVROLET
STRUXGL
- MEMBER
- 11 POSTS
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You need to find a vacuum line that has a constant vacuum. Look to see if you can find on coming off of the intake manifold. Be carefull not to remove one the will effect the performance of the motor. I personaly like to use the hose that goes to the PVC valve. Remove the valve and simply connect the gauge in place. The reading for a normal heathly engine should be a steady needle between 17 to 22.
Hope this helps. Backyardmechanic :o
PS A vacuum gauge is a excellent tool for troubleshooting engine problems but is not used to much by mechanics today.
Hope this helps. Backyardmechanic :o
PS A vacuum gauge is a excellent tool for troubleshooting engine problems but is not used to much by mechanics today.
Dec 4, 2006 at 2:09 AM
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Suggested Repair
Connect a vacuum gauge to a constant vacuum source, such as the PCV hose after removing the PCV valve, and avoid lines that affect engine performance. A healthy engine should show a steady reading of 17 to 22.
Conversation Summary
The owner of a 1998 Chevrolet Tahoe 5.7 V8 asked where to connect a vacuum gauge and what reading is normal. The expert advised using a constant vacuum line, preferably the PCV hose, and expecting a steady 17 to 22 on a healthy engine.