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Send PMLenexa, KS - USA
Joined: 9/25/2015
Posts: 1
Vette(s): 1991 Coupe, dark red with saddle interior, automatic. Original car, no customization.
My '91(standard coupe/automatic) has been thoroughly code checked and mechanically performs well within specs. The car is always driven in the overdrive position for the auto transmission and shifts properly. However, the "shift now" indicator lights comes on, on the dash right between 55-60 mph while accelerating, closely followed be the CES light on the control panel coming on and staying on until the end of the drive regardless of speeds up and down during the run. As I said, everything with the ignition, fuel system, EGR, etc., etc., has been checked out. Our theory now is that this is likely something within electronics getting some form of false message to trigger the shift indicator well after the transmission has already shifted up.
Let me hear from you if have shed any light on getting this distraction eliminated from an otherwise highly enjoyable ride.
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Duncanville, TX - USA
Joined: 11/8/2003
Posts: 22714
Vette(s): #1-1974 L-48 4spd Cp Med Red Metallic/Black deluxe int w/AC/tilt/tele./p/w-p/b/
Am-Fm/map light National/Regional/Chapter NCRS "Top Flight"
#2-1985 Bright Red/Carmine Cp.L-98/auto
Member: NCRS, NCRS Texas, Corvette Legends of Texas
I don't understand why your automatic car would have the "shift now" light in the first place. I'd have to check into that. Have you tried pulling any codes out of it while the CES light is on? That would give you/us an idea of what the PCM thinks is going on, and would give you a starting place to diagnose the issue.
Joel Adams
C3VR Lifetime Member #56 
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"
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Send PMCrystal Springs, MS - USA
Joined: 7/29/2011
Posts: 34
Vette(s): 1973 Mille Miglia Red LS5
1981 Claret Red
1982 White
1985 Silver Metallic
1988 Yellow
1993 Torch Red ZR-1
1994 Torch Red Coupe LT1
1996 Dark Purple Metallic LT4
2000 Torch Red
2001 Light Pewter
2003 Z06 Millennium Yellow
2009 Atomic Orange
Check your vacuum lines...
1981 Dark Claret Metallic - SOLD
1982 White
94 Torch Red LT1
96 Dark Purple Metallic LT4
02 Black Convertible - SOLD
03 Millennium Yellow Z06
09 Atomic Orange Z51
09 Atomic Orange Z51
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in Forum: C4 General Discussion
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