4l60e smoked?
Thread Starter
Joined: May 2011
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From: kansas city,mo
4l60e smoked? well I think my tranny may be toast. it slips in every gear but if you shut it off and start it up its ok for a while. is it time for a th400 or is there a simple fix? the tranny only has 9000 miles on it and was rebuilt to hold a bit more power.
Thread Starter
Joined: May 2011
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From: kansas city,mo
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From: Ann Arbor, MI
Bad solenoids won't cause the trans to slip.
Since you say it slips in all gears, I would suspect low line pressure. Have the local trans shop connect a pressure gauge to it and observe line pressure under medium to high throttle. A defective EPC (pressure control solenoid) can cause too-low line pressure. So can a defective engine sensor, especially the TPS.
At a minimum, a "built" trans should have a larger boost valve in it which will increase line pressure across the board, have a higher max pressures, and thereby reduce slippage. Ask if this was done. If not, get the Sonnax 4L60E-LB1 installed asap; it takes a trans shop 5 minutes to install after dropping the pan.
Since you say it slips in all gears, I would suspect low line pressure. Have the local trans shop connect a pressure gauge to it and observe line pressure under medium to high throttle. A defective EPC (pressure control solenoid) can cause too-low line pressure. So can a defective engine sensor, especially the TPS.
At a minimum, a "built" trans should have a larger boost valve in it which will increase line pressure across the board, have a higher max pressures, and thereby reduce slippage. Ask if this was done. If not, get the Sonnax 4L60E-LB1 installed asap; it takes a trans shop 5 minutes to install after dropping the pan.
Thread Starter
Joined: May 2011
Posts: 338
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From: kansas city,mo
the fluid in the trans smells burnt bad. im assuming its toast. gonna yank it out and take it in and see if its a simple fix if not im gonna do it right this time and put a th400 in it.
Thread Starter
Joined: May 2011
Posts: 338
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From: kansas city,mo
the thing that gets me is if u turn it off and start it back up its fine for a few minutes. like today when it happen i noticed it was slipping so i took it home and about a quarter mile from home i got stuck at a light and it wouldnt move. pushed it in a gas station and shut it off then started it up and could make it home.
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Verdad Gallardo Thread Starter
Joined: May 2011
Posts: 338
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From: kansas city,mo
Bad solenoids won't cause the trans to slip.
Since you say it slips in all gears, I would suspect low line pressure. Have the local trans shop connect a pressure gauge to it and observe line pressure under medium to high throttle. A defective EPC (pressure control solenoid) can cause too-low line pressure. So can a defective engine sensor, especially the TPS.
At a minimum, a "built" trans should have a larger boost valve in it which will increase line pressure across the board, have a higher max pressures, and thereby reduce slippage. Ask if this was done. If not, get the Sonnax 4L60E-LB1 installed asap; it takes a trans shop 5 minutes to install after dropping the pan.
Since you say it slips in all gears, I would suspect low line pressure. Have the local trans shop connect a pressure gauge to it and observe line pressure under medium to high throttle. A defective EPC (pressure control solenoid) can cause too-low line pressure. So can a defective engine sensor, especially the TPS.
At a minimum, a "built" trans should have a larger boost valve in it which will increase line pressure across the board, have a higher max pressures, and thereby reduce slippage. Ask if this was done. If not, get the Sonnax 4L60E-LB1 installed asap; it takes a trans shop 5 minutes to install after dropping the pan.
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Joined: Aug 2010
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From: Ann Arbor, MI
A good scanner should show you TPS percentage; you want to be sure it reads from at/close-to 0% closed throttle to at/close-to 100% full throttle. IIRC we recently had a thread where it was only reading 50% and the OP's trans was slipping.
It is very useful to connect a pressure gauge - it will have a long hose and you can read it while driving. The pressure will change from e.g. 50 lbs to 175 lbs depending upon throttle position. If you see that you can be reasonably sure that all engine sensors, the PCM and the tune are all working. A couple mechanics told me they replace the EPC as a first step because they can intermittently stick or react too slow to prevent slippage. In other words, the pressure gauge might show good numbers even with a bad EPC.
Of course, if the fluid smells burnt then the trans might already be toast, but it is possible that a sensor or EPC problem caused the failure.
It is very useful to connect a pressure gauge - it will have a long hose and you can read it while driving. The pressure will change from e.g. 50 lbs to 175 lbs depending upon throttle position. If you see that you can be reasonably sure that all engine sensors, the PCM and the tune are all working. A couple mechanics told me they replace the EPC as a first step because they can intermittently stick or react too slow to prevent slippage. In other words, the pressure gauge might show good numbers even with a bad EPC.
Of course, if the fluid smells burnt then the trans might already be toast, but it is possible that a sensor or EPC problem caused the failure.
I would suggest dropping the pan and doing a visual inspection. If it looks well then get a good quality OEM filter and service the unit. I have seen where cheap filters will collapse and will not allow fluid to pump. I only use filter tech or spx filtran filters. Hope this helps. Vince
Thread Starter
Joined: May 2011
Posts: 338
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From: kansas city,mo
I would suggest dropping the pan and doing a visual inspection. If it looks well then get a good quality OEM filter and service the unit. I have seen where cheap filters will collapse and will not allow fluid to pump. I only use filter tech or spx filtran filters. Hope this helps. Vince
Basically a pan full of crap. If it looks pretty good then like I said I would service it with a good quality filter first to see if you can save it. If you would like send me a pm with a pic or link back to this thread when you do get it down. I would be more than willing to take a look at it for you. Vince
