Thread: shifting issues
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Old 03-09-2012, 09:02 AM
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JimFreeh JimFreeh is offline
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Join Date: Mar 2007
Location: Hampton Roads, Virginia
Posts: 3,366
Check vacuum to trans.

Tap comes off intake manifold by cylinders 5 and 6.
Line crosses over to passenger side, and connects to vacuum modulator.

Low/no vacuum signal would tell trans the engine is working hard and that could cause the trans to delay upshifts.

Vacuum modulator on the trans body can also fail, check to see if it holds vacuum.

Jim
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