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Engine Surge - 2001 GMC Sonoma 4.3 V6 4l60E

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Engine Surge - 2001 GMC Sonoma 4.3 V6 4l60E

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  #11  
Old 11-06-2018, 08:42 AM
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Originally Posted by Swampdawg View Post
So i've ironed out most of my issues except one.
On early morning trips to work and cruising in cruise control around 60-70 the transmission is wanting to ship between 3rd and O/D.
It doesn't seem to do it in the afternoons and all other gears are shifting great with no issues.
I've through other issues replaced:
TPS
MAF
PCV Valve
Any input from those with more knowledge?
I'm still not convinced that what you are feeling is a 3-4 shift, but the vehicle isn't in front of me. If the difference is only 200-400 rpm, then it is TCC. A 3-4 shift would be more RPM difference than that. You can test it by pulling it down into third manually and checking the difference in RPMs.

If it is really shifting between 3-4, then Transman304 is your best friend. It should take a pretty good load on the engine to cause it to downshift into 3rd.

good luck and best wishes.
 
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  #12  
Old 11-06-2018, 09:21 AM
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By any chance do you have a resource for the spec, I've looked around but cannot find a chart or anything to go by.
 
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  #13  
Old 11-06-2018, 09:23 AM
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@les
The original problem is solved. The small surge and associated feeling has resolved. This is a much larger RPM difference and was confirmed by checking the truck at RPM in 3rd Gear as opposed to running in O/D and feeling the surge.
If i can find a resource chart to check the Pressure ranges i should be seeing I will hookup the gauge and test it.
 
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  #14  
Old 11-06-2018, 10:00 AM
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  #15  
Old 11-06-2018, 01:33 PM
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OK - so it's a 4th down into 3rd shift, right? There is your pressure spec and test procedure! But if you have had all the tap cell data cleared shortly ago, shouldn't you give it a chance to learn how to correct itself on the 3-4-3 shifting. I have no idea how many miles have passed since then.

Transman, if there was something wrong with the line pressure required to shift in the designated time, wouldn't that show up as a skewed tap cell value? I know (just enough about this to be dangerous).
 

Last edited by LesMyer; 11-06-2018 at 01:51 PM.
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  #16  
Old 11-06-2018, 03:58 PM
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@Les
Approximately 500-800 miles have passed. I'll get a pressure gauge and run the test to see the results. I guess the good and the bad is if it does happen to be the tranmission with an internal issue. I have anotehr 4l60E i took out. I'll start doing a complete rebuild on it and then I'll just have to do another swap, just want to make sure thats the problem before investing the time and money.
 
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  #17  
Old 11-08-2018, 10:02 AM
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Went to pick up the pressure gauge for testing and it was out so i'll make another run but question until then. Does the TCC Solenoid control 1-2 2-3 or 1-2 3-4? I've seen mixed answers and just wanted some clarification.
Also for @transman I've noticed you comment on some 4L60E rebuild links, do you have a recommended kit for rebuild (or set of kits) and or a list of specific parts you suggest subbing in those because of known issues?
If not i completely understand and i can put it all together with some research just didn't know if it was something that had been posted before and i couldn't find it.
 
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  #18  
Old 11-08-2018, 10:27 AM
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Originally Posted by Swampdawg View Post
Went to pick up the pressure gauge for testing and it was out so i'll make another run but question until then. Does the TCC Solenoid control 1-2 2-3 or 1-2 3-4? I've seen mixed answers and just wanted some clarification.
Also for @transman I've noticed you comment on some 4L60E rebuild links, do you have a recommended kit for rebuild (or set of kits) and or a list of specific parts you suggest subbing in those because of known issues?
If not i completely understand and i can put it all together with some research just didn't know if it was something that had been posted before and i couldn't find it.
TCC solenoid controls Torque Converter Clutch application (not transmission shifting). However, TCC will not operate unless transmission is in 3rd or 4th gear.

What are you going to use to run the tests (control the transmission) while you are checking pressures - that requires a capable scan tool. I suppose you could take back to the trans shop with the pressure gauge installed and talk them into doing the test for some $$$.
 

Last edited by LesMyer; 11-08-2018 at 10:30 AM.
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  #19  
Old 11-10-2018, 10:29 AM
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I have no clue why that posted again. Was writing a response and this appeared and can’t get rid of it. Anyone help?
 
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