I would check the MAP sensor and the coolant temp sensor. It will be hard to diagnose with out a scanner, but you can measure resistance and voltage.
Help!! 1986 Buick Regal Grand National
- Thread starter SamanthaRam
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Absolutely a ScanMaster FIRST, then proceed fwd.
First thing I would do is install a vacuum gauge on it at a good vacuum source.
See what vacuum reading you get.
A stock LC2 TR 3.8 should pull 16-18” of vacuum
If your getting a low reading, you need to check, double check, and triple check ALL VACUUM lines.
These cars a notorious for rotted cracked vac lines.
First thing I would do is install a vacuum gauge on it at a good vacuum source.
See what vacuum reading you get.
A stock LC2 TR 3.8 should pull 16-18” of vacuum
If your getting a low reading, you need to check, double check, and triple check ALL VACUUM lines.
These cars a notorious for rotted cracked vac lines.
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