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99 Lumina shifting problems

Tiny
GEOZOR
  • MEMBER
  • 1999 CHEVROLET LUMINA
  • 276,000 MILES
I just rebuild my 3.1 M engine. Before the rebuild I had transmission problems, and I had replaced the vacuum modulator with a cheap adjustable one. With the rebuild I found that the TPS was broken. Anyway everything works and I have tryied to adjust the modulator many times but the car still will not shift before 4000 rpm. Any ideas on how to adjust the modulator before I throw it in the garbage?
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Monday, December 19th, 2011 AT 9:43 PM

2 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It's probably not the modulator. It could be a govenor or bad electrical connection. Take to a trans guy and have him scan it for codes. It could be a stuck valve in trans.
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Monday, December 19th, 2011 AT 11:25 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
Get a new modulater. Those cheap ones are only good for a few adjustments than thier junk.
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Tuesday, December 20th, 2011 AT 12:11 AM

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