1990 Chevy Lumina

Tiny
MARTIN LOPEZ
  • MEMBER
  • 1990 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 236,283 MILES
Transmission may shift late or not upshift at all. Why?
Tuesday, December 22nd, 2009 AT 8:38 AM

1 Reply

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Welcome to the forum, one thought is the vacuum modulator, where applicable. Located on the front side of transaxle, down low. Has a vacuum line going to it. I did look at a vacuum diagram for your vehicle, didn't see the modulator on the diagram. Just a thought.
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Tuesday, December 22nd, 2009 AT 9:55 AM

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