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Upshift Light

warp8

Well-known member
Joined
Jun 5, 2006
Messages
95
Location
Florida
Anyone know what controls the Upshift light or where it is in the FSM.

It is staying on all the time in my 86.
 
T

tdr1919

Guest
Anyone know what controls the Upshift light or where it is in the FSM.

It is staying on all the time in my 86.

Wow Eddie, my upshift light is sporadic, like my MPG guage, I figured they were tied together somehow.
Tom
 

warp8

Well-known member
Joined
Jun 5, 2006
Messages
95
Location
Florida
Well

Today, I drove it and the light stayed out. Just a gremlin I guess.
 

warp8

Well-known member
Joined
Jun 5, 2006
Messages
95
Location
Florida
It's baaaack!

Intermittently with no rhyme or reason. I am running a pcmforless chip. I may put the stock chip back in to see if that is the cause.
 
T

tdr1919

Guest
It's baaaack!

Intermittently with no rhyme or reason. I am running a pcmforless chip. I may put the stock chip back in to see if that is the cause.

I'm surprised that we havent had any of our "C4 techno-wizards" jump in and tell us how we can go about trouble-shooting this thing.

Tom
 

warp8

Well-known member
Joined
Jun 5, 2006
Messages
95
Location
Florida
I am a little surprised myself. I am going to pull the unit out again and make sure its nothing that I did to it when I replaced the bulbs.
 

G Winter

Well-known member
Joined
Aug 21, 2004
Messages
2,177
Location
NW Iowa
Corvette
1990 red convert 6 sp
I don't know for sure but it is my guess that the ecm controlls the shift light.
If I get some time I will look it up in my Helms.

Glenn
:w
 

warp8

Well-known member
Joined
Jun 5, 2006
Messages
95
Location
Florida
I think you're right. I removed the unit today and dissassembled it and everything seems OK. Didn't start till I changed the chip.
 

G Winter

Well-known member
Joined
Aug 21, 2004
Messages
2,177
Location
NW Iowa
Corvette
1990 red convert 6 sp
I may be talking about something diff. now that I look at the post closer. I was thinking about the 1 to 4 shift light on the six speed. That also only allows a shift from 1 to 4.

Glenn
:w
 

warp8

Well-known member
Joined
Jun 5, 2006
Messages
95
Location
Florida
I may be talking about something diff. now that I look at the post closer. I was thinking about the 1 to 4 shift light on the six speed. That also only allows a shift from 1 to 4.

Glenn
:w

No sweat! Mine is an Auto.
 

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