LT1 Based Engine Tech 1993-1997 LT1/LT4 Engine Related

Full throttle, won't shift into 2nd????

Thread Tools
 
Search this Thread
 
Old 08-25-2003, 10:52 AM
  #1  
Registered User
Thread Starter
 
95redvert's Avatar
 
Join Date: Aug 2003
Posts: 133
Full throttle, won't shift into 2nd????

When under full throttle at the 1/4 mile she wouldn't shift into second gear. She would just keep jumping off her redline and not shift. Has anyone else experienced this, and what is the problem??
95redvert is offline  
Old 08-25-2003, 10:56 AM
  #2  
Registered User
 
IrocManiac's Avatar
 
Join Date: Apr 2000
Location: Tulsa
Posts: 1,208
Unplug your battery for 30 mins and see if that fixes it...sounds like the pcm could be off...possibly even the tranny is going bad on you...but being a 95 model it is electronically controlled so I'd start with resetting the pcm.
IrocManiac is offline  
Old 08-25-2003, 11:48 AM
  #3  
Registered User
 
LimitedEd1LE's Avatar
 
Join Date: Aug 2002
Location: Chicagoland Area
Posts: 560
It also sounds like a computer issue. Have you ever had your PCM re-tuned? Either that or you transmission doesn't have enough pressure in the lines to shift into 2nd.
LimitedEd1LE is offline  
Old 08-25-2003, 12:02 PM
  #4  
Registered User
 
anaik's Avatar
 
Join Date: Feb 2000
Location: Cleveland,OH
Posts: 1,335
The PCM uses the TPS and vehicle speed to determine shift points, another direction to look.
anaik is offline  
Old 08-25-2003, 12:09 PM
  #5  
Registered User
Thread Starter
 
95redvert's Avatar
 
Join Date: Aug 2003
Posts: 133
What should the TPS be set at on a '95? I know on my '88 GTA it is at .54 volts, what is it for a '95 LT1??
95redvert is offline  
Old 08-25-2003, 12:12 PM
  #6  
Registered User
Thread Starter
 
95redvert's Avatar
 
Join Date: Aug 2003
Posts: 133
And no I haven't had the pcm retuned. I was thinking of getting the HPP III because I will be installing a set of 3:42's and wanted to adjust the pcm for that. Also wanted to lower my fan temp. And now I could try to adjust my shift points and firm them up, maybe that could work?
95redvert is offline  
Old 08-25-2003, 12:19 PM
  #7  
Registered User
 
95camaro z28LT1's Avatar
 
Join Date: Jun 2003
Location: new york
Posts: 127
I had the same problem

My car is off the road now because my tranny is shot. I started out with the same problem that you described. I found out the my car had problems when a piece of crap civic decided to race me. I raced him and then when I was expecting my car to shift from first to second, It didn't.

I waited it out and it got worse over time. Now my car is off the road until next year because I am not putting it on the road for 2 months and then taking it off for winter.

My tranny is shot. I forgot to say my car is a 95z28. Your problem may be computer, but the important thing is to check that tranny fluid. If it smells burned and is black or brown, your tranny is shot. There is nothing you can do other than fix it or let it get worse.
95camaro z28LT1 is offline  
Old 08-25-2003, 12:25 PM
  #8  
Registered User
 
anaik's Avatar
 
Join Date: Feb 2000
Location: Cleveland,OH
Posts: 1,335
Originally posted by 95redvert
What should the TPS be set at on a '95? I know on my '88 GTA it is at .54 volts, what is it for a '95 LT1??
When closed it can be between .4-.7 volts. When fully open it should be about 4 volts more than when closed. My thinking was if it's not showing 4.X volts when fully open the PCM will not tell the tranny to shift.
anaik is offline  
Old 08-25-2003, 01:40 PM
  #9  
Registered User
 
IrocManiac's Avatar
 
Join Date: Apr 2000
Location: Tulsa
Posts: 1,208
Re: I had the same problem

Originally posted by 95camaro z28LT1
My car is off the road now because my tranny is shot. I started out with the same problem that you described. I found out the my car had problems when a piece of crap civic decided to race me. I raced him and then when I was expecting my car to shift from first to second, It didn't.

I waited it out and it got worse over time. Now my car is off the road until next year because I am not putting it on the road for 2 months and then taking it off for winter.

My tranny is shot. I forgot to say my car is a 95z28. Your problem may be computer, but the important thing is to check that tranny fluid. If it smells burned and is black or brown, your tranny is shot. There is nothing you can do other than fix it or let it get worse.
Good call on the tranny fluid...granted my experience with the 700R4 are all before the electronic version was available in the F body but tranny fluid is critical in an auto trans and makes a huge difference in these transmissions in the way they shift, and when/where they shift...
IrocManiac is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
PCLZ28
Drivetrain
6
04-29-2015 11:56 PM
Roadie
Parts For Sale
7
02-16-2015 10:34 AM
Lt1son
N2O Tech
0
11-25-2014 01:52 PM
chevroletfreak
LT1 Based Engine Tech
202
07-04-2005 05:00 PM
Brady
Drag Racing Technique
8
07-29-2002 10:30 PM



Quick Reply: Full throttle, won't shift into 2nd????



All times are GMT -5. The time now is 04:06 PM.