SST Question

Pete02LSE

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Tonight, I am in the process of changing the valve cover gaskets. I installed the passenger side...buttoned everything up and took it out for a drive...just to make sure I didn't screw anything up. Well...on my test drive...I observed something I have never noticed before. When shifting over to SST at speed...it would start out in first. Therefore, I chirped the rear tires on the downshift. I tried it two other times...with the same results.

I thought if you shifted over into SST, it would stay in the current gear...not go to first.

Any ideas? PCM calibration problem? I've never noticed this before.

TIA,
-Pete
02 LSE
 
Pete02LSE said:
Tonight, I am in the process of changing the valve cover gaskets. I installed the passenger side...buttoned everything up and took it out for a drive...just to make sure I didn't screw anything up. Well...on my test drive...I observed something I have never noticed before. When shifting over to SST at speed...it would start out in first. Therefore, I chirped the rear tires on the downshift. I tried it two other times...with the same results.

I thought if you shifted over into SST, it would stay in the current gear...not go to first.

Any ideas? PCM calibration problem? I've never noticed this before.

TIA,
-Pete
02 LSE

I use SST quite often and it is supposed to stay in the current gear. Imagine doing 65 mph in 5th and dropping to 1st. Ouch. Dealer time!:)
 
IIRC, the pre-'03s won't go into 1st in SST mode in stock trim. Either way, it shouldn't shift into 1st when you go to SST mode--at least my '04 doesn't. Something's wrong, but I don't know what you could've done to break that. I'd guess that you knocked a connector loose, pulled a wire out of a connector, cut a wire, or did something similar. Go back to the passenger side and check the wires and connectors in the vicinity...
 
They had to keep it in second to pass emissions. If you punch the throttle, it drops to first.
 
SurfjaxLS said:
They had to keep it in second to pass emissions. If you punch the throttle, it drops to first.

Don't the later models start out in first without the "punch it at the stop light" trick?
 
2001LS8Sport said:
Don't the later models start out in first without the "punch it at the stop light" trick?

yep - the 03+ engine was a bit more efficient (VVT) and could pass the CAFÉ test while in 1st.
 
Well...strange...it was ok today. Maybe when I was pulling it over I was accidently pulling it back into first...I was pretty tired...who knows.

Anyway...thanks for the replies.

-Pete
02LSE
 
All my SST 1st gear questions were answered on page 158 & 159 in the owners manual. At any time in SST mode, when the throtle is past 60% in 2nd, 3rd, 4th, or 5th gear, 1st gear is available as long as you do not come to a complete stop. It would be nice to start from 1st gear but I can not start from a complete stop in 1st gear.

+ and - position operation
These positions allow the driver to
manually select the appropriate
upshift (+) or downshift (-) and
gear range.
² Can only be entered from the D5
(Overdrive) shift position.
² Gear ranges 1–5 provide the same
function and ratio as found in the
D5 or D4 automatic mode positions.
² The transmission will not upshift or
downshift unless the gearshift lever
is moved forward or rearward.
² One tap forward (+) will
command the transmission to upshift one gear range.
² One tap rearward (-) will command the transmission to downshift one
gear range.
² Upshifts are allowed at any vehicle speed.
² 2 (Second) gear is normally used for start-up. A 3 (Third) gear
start-up will be allowed only if selected. All other selection(s) will
revert to 2 (Second) gear.
² If the driver starts in 2 (Second) gear and does not pass a throttle
angle of 60%, the transmission will remain in 2 (Second) gear. No
automatic upshift will occur.
² If the driver passes the 60% throttle angle, a 2–1 kickdown will occur,
scheduled by the processor as used in D5. Once the 2–1 kickdown has
occurred, the transmission will remain in 1 (First) gear until 2
(Second) gear is manually selected by moving the gearshift lever. No
automatic upshift will occur.
² Once a 2–1 kickdown has occurred, manually shifting in and out of 1
(First ) gear is allowed until the vehicle comes to a complete stop.
² A shift to 1 (First) with the vehicle at a stop is never allowed.
² When downshifting at normal road speeds, the transmission will only
allow a downshift into the next lower gear.
² If the gearshift lever is moved into the downshift (-) position more
than once in rapid succession, the transmission will only allow a
downshift into the next lower gear to prevent possible engine and/or
transmission damage. Once the vehicle reaches below a specified entry
Driving
158
speed for the next lower gear, the transmission will allow another
downshift to occur if selected by the driver.
Recommended Shift Speeds
Upshift according to the following charts:
Recommended upshifts when accelerating
Select Shift V6 3.0L
Shift from:
1 - 2 n/a
2 - 3 39 km/h (24 mph)
3 - 4 56 km/h (35 mph)
4 - 5 69 km/h (43 mph)
Recommended upshifts when cruising
Select Shift V6 3.0L
Shift from:
1 - 2 n/a
2 - 3 29 km/h (18 mph)
3 - 4 50 km/h (31 mph)
4 - 5 64 km/h (40 mph)
Recommended upshifts when accelerating
Select Shift V8 3.9L
Shift from:
1 - 2 n/a
2 - 3 34 km/h (21 mph)
3 - 4 51 km/h (32 mph)
4 - 5 66 km/h (41 mph)
Recommended upshifts when cruising
Select Shift V8 3.9L
Shift from:
1 - 2 n/a
2 - 3 26 km/h (16 mph)
3 - 4 47 km/h (29 mph)
4 - 5 61 km/h (38 mph)
Driving
159
 

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