89 4.0 vacuum leaks?
10-24-2015, 12:23 PM
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89 4.0 vacuum leaks?
Working on an 89 XJ with 274k miles on it with the 4.0. Starts hard and there is a hissing/sucking noise. Measured the vacuum and it's around 16-17 inHg. What is normal? When revving it up, it goes into the normal range. What should I be looking at? I've never diagnosed vacuum leaks before. Thanks much!
10-24-2015, 11:36 PM
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0
Check to be sure the intake manifold bolts are snug.
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