2000 Silverado 5.3 surges in OD at @40-50mph
05-17-2005 | 07:58 AM
#11
Originally Posted by okichessy
I live in San Angelo, TX. I'm going to try disconnecting the Powrshift and see what happens. As far as gas goes I'm in the military and buy 95% of my gas on base. I"ll keep all ya'll posted..... Thanks for all the help!!
My costs are a little different, I have a mechanic that we trade labor and parts. My truck stays on "credit" as so does any electrical work in his house. Good luck, let us know, you are pretty stock so it should be something small (sorta). Hell a bad FPR could be it.
05-23-2005 | 01:39 PM
#14
Thread Starter
Teching In
Joined: May 2005
Posts: 7
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No codes...
Took the Silverado to Autozone and they did a scan for free. Unfortunaltely no codes came up. I'm going to completely disconnect the PowerShift box and see what happens. I'll check the EGR valve and see if that is the problem..
06-14-2005 | 08:29 AM
#16
Staging Lane
Joined: Jun 2005
Posts: 85
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Originally Posted by Weedo
Is there a way to easily check the "lockup"? That's exactly what it sounds like to me. The converter going in and out of lockup...
Easy way to check lockup is to get on the road going about 50, then keep your foot steady on the gas and just touch the brake pedal and look for a 200 rpm increase. As soon at the PCM gets the brake signal, it releases the TCS.
06-15-2005 | 04:25 PM
#17
Teching In
Joined: Jun 2005
Posts: 8
Likes: 0
From: Colorado
Hey there!
New to this forum but I have been around on the WS6 and F-body boards for my T/A when I used to own it...still miss that LT1 rocket!
Anyway, I have this very same issue and read on another forum about this issue. Here is a quote from a "enthusiast level" user on that forum:
"4L60-E is the type of transmission in your truck. They are found on many GM products (including my 96 Impala SS and my 2000 Yukon). Starting in 97 (at least I think it is 97), they started using PWM to control the lock-up. This was done for fuel economy. PWM = Pulse Width Modulation.
The converter is only locked up in OD. The shift to OD is usually at 40 MPH. Soon after that the converter is locked up (unless you give it gas). That is why you are seeing this from 43 to 55 MPH.
Is your check engine light on? It will if the problem gets worse. Most likely, you will get a P1870. Has the fluid and filter ever been changed.
The Transgo Reprogramming Kit converts the PWM style lockup to the non-PWM style. The Reprogramming kit can be installed without removing the tranny and will work with the PWM style torque converter (from what I understand). The other benefit to the Reprogramming kit is that is will improve line pressure which means the 3/4 clutch pack will live longer. I bought this kit for Impala SS but have not installed it yet.
I tried to find some info on the Internet but could not really find anything that describes the PWM style of lockup".
Ok you can check for this condition yourself by tapping the brake pedal when the surging is happening and if it goes away then you know that the problem is with the torque converter locking up. I just flushed out the fluid again (now at 90k) which did not fix the issue like last time and I have no codes present or never have. So, has anyone done one of these reprogram kits? I have never really done much with transmissions, so I do not have any idea how hard this is to do. Also, I read that some people get the problem to stop by using a Hypertech programmer, but that is not exactly a cheap way to go since the TransGo kit is about $80. Besides, are their not better programmers than the Hypertech for our trucks? Any opinions are welcome on any of this....I'd love to get this issue solved...along with my hard starting (have to replace leaky FPR) and my clunk noise in the steering shaft!!! Sheesh, should have kept my T/A!!! ;-)
Again, hope this helps too!
New to this forum but I have been around on the WS6 and F-body boards for my T/A when I used to own it...still miss that LT1 rocket!
Anyway, I have this very same issue and read on another forum about this issue. Here is a quote from a "enthusiast level" user on that forum:
"4L60-E is the type of transmission in your truck. They are found on many GM products (including my 96 Impala SS and my 2000 Yukon). Starting in 97 (at least I think it is 97), they started using PWM to control the lock-up. This was done for fuel economy. PWM = Pulse Width Modulation.
The converter is only locked up in OD. The shift to OD is usually at 40 MPH. Soon after that the converter is locked up (unless you give it gas). That is why you are seeing this from 43 to 55 MPH.
Is your check engine light on? It will if the problem gets worse. Most likely, you will get a P1870. Has the fluid and filter ever been changed.
The Transgo Reprogramming Kit converts the PWM style lockup to the non-PWM style. The Reprogramming kit can be installed without removing the tranny and will work with the PWM style torque converter (from what I understand). The other benefit to the Reprogramming kit is that is will improve line pressure which means the 3/4 clutch pack will live longer. I bought this kit for Impala SS but have not installed it yet.
I tried to find some info on the Internet but could not really find anything that describes the PWM style of lockup".
Ok you can check for this condition yourself by tapping the brake pedal when the surging is happening and if it goes away then you know that the problem is with the torque converter locking up. I just flushed out the fluid again (now at 90k) which did not fix the issue like last time and I have no codes present or never have. So, has anyone done one of these reprogram kits? I have never really done much with transmissions, so I do not have any idea how hard this is to do. Also, I read that some people get the problem to stop by using a Hypertech programmer, but that is not exactly a cheap way to go since the TransGo kit is about $80. Besides, are their not better programmers than the Hypertech for our trucks? Any opinions are welcome on any of this....I'd love to get this issue solved...along with my hard starting (have to replace leaky FPR) and my clunk noise in the steering shaft!!! Sheesh, should have kept my T/A!!! ;-)
Again, hope this helps too!
06-15-2005 | 04:26 PM
#18
Teching In
Joined: Jun 2005
Posts: 8
Likes: 0
From: Colorado
Originally Posted by sd155racer
Easy way to check lockup is to get on the road going about 50, then keep your foot steady on the gas and just touch the brake pedal and look for a 200 rpm increase. As soon at the PCM gets the brake signal, it releases the TCS.
LOL....you just beat me to it!!! Ah, gotta love it though!!!
06-17-2005 | 01:34 PM
#19
TECH Regular
Joined: Dec 2002
Posts: 486
Likes: 0
From: Pensacola, FL
It seems you are not alone with this exact same problem. I took my truck back to the shop that just rebuilt my 60E into a 65E. They ran the scanner on it and got no codes whatsoever. I am going to do the brake apply 'test' to see if it makes a difference...if so, I will take it back since the tranny shop also installed a new TC at the rebuild.
