Ghost in Transmission
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Instructor
Joined: May 2010
Posts: 101
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Ghost in Transmission
I have a 98 C5 with auto trans. Shifts normal manualy and in auto mode. When in 4th if I need to add a little speed, it will slip for about 1000 to 1200 rpms or 3 seconds and then grab. If I hit it hard, it grabs no problem. Even if I use the cruise control to upspeed, it will slip the same. With cruise on and going up any kind of grade, where it need to keep speed up it slips the same. Normal auto mode from red light and regular throttle, shifts fine. Only happens when I'm already in 4th (overdrive) and needing to increase speed a little. Floor it, while in 4th, and it grabs fine. Driving me crazy trying to figure it out. If it happened in all shifting in every gear I could probably have a good chance to figure it out. Surely, I'm not the only C5 auto this has happened to. Any ideas out there. Thanks.
Burning Brakes
Joined: Jul 2011
Posts: 1,096
Likes: 110
From: Fredericksburg Virginia
You say slip but does the RPM's shoot up during that time? It sounds more like a delay of it downshifting or almost a hesitation. Better description will help us help you. Have you used the DIC to pull codes?
Chris
Chris
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Instructor
Joined: May 2010
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AS I stated in my thread, rpm's raise 1000 to 1200 for about 3 seconds before it grabs. To me that is not a hesitation, but a slip. The only codes are for my 02 sensors, which I'm sure are burned out because of the headers. Anyway, I've already purchased them to intall when I do the trans service. It only does this exactly the way I described it in my thread. I don't know how I could give a better description. I am going to change the 3-4 selonoid, maybe all of them and the harness. Can't hurt. I was just hoping that someone else has had this weird occurance. But thanks for helping. If you can think of something else, let me know please.
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Sounds like you have a problem with line pressure.
When was the last time you changed the trans fluid and the last time you checked the fluid level the DIFFICULT PROPER WAY???
Is your trans and engine stock, modified and have you ever tuned the PCM?
The longer you let it run this way, the more you are damaging that band .
Call RKT56 Rick Kim (forum sponsor) and discuss the issue with him. He will give you the right guidance.
Bill
When was the last time you changed the trans fluid and the last time you checked the fluid level the DIFFICULT PROPER WAY???
Is your trans and engine stock, modified and have you ever tuned the PCM?
The longer you let it run this way, the more you are damaging that band .
Call RKT56 Rick Kim (forum sponsor) and discuss the issue with him. He will give you the right guidance.
Bill
Thread Starter
Instructor
Joined: May 2010
Posts: 101
Likes: 2
ghost in transmission
Sounds like you have a problem with line pressure.
When was the last time you changed the trans fluid and the last time you checked the fluid level the DIFFICULT PROPER WAY???
Is your trans and engine stock, modified and have you ever tuned the PCM?
The longer you let it run this way, the more you are damaging that band .
Call RKT56 Rick Kim (forum sponsor) and discuss the issue with him. He will give you the right guidance.
Bill
When was the last time you changed the trans fluid and the last time you checked the fluid level the DIFFICULT PROPER WAY???
Is your trans and engine stock, modified and have you ever tuned the PCM?
The longer you let it run this way, the more you are damaging that band .
Call RKT56 Rick Kim (forum sponsor) and discuss the issue with him. He will give you the right guidance.
Bill
Tech Contributor
Joined: Dec 1999
Posts: 32,910
Likes: 2,402
From: Anthony TX
CI 6,7,8,9,11 Vet
St. Jude Donor '08
Rick Kim
RKT56
http://rkt56.com
Phone number: 301-257-0930
205 Bucheimer Road, #C
Frederick, MD 21701
RKT56
http://rkt56.com
Phone number: 301-257-0930
205 Bucheimer Road, #C
Frederick, MD 21701
Thread Starter
Instructor
Joined: May 2010
Posts: 101
Likes: 2
ghost in transmission
Rick Kim
RKT56
http://rkt56.com
Phone number: 301-257-0930
205 Bucheimer Road, #C
Frederick, MD 21701
RKT56
http://rkt56.com
Phone number: 301-257-0930
205 Bucheimer Road, #C
Frederick, MD 21701
