Question about 1998 Chevrolet S-10 Pickup
After I drive about 2 hours the transmition will shift very hard and the engine light will turn on. I change the transmition about a year ago and its doing it again. What can I do to fix this problem.
Thank you in advance
This is a common problem with the 4l60e transmission,
you need to have the system scaneed for codes, my guess is you will get a p1870 code,
this means internal slippage detected.
the most likely cause is a valve body malfunction, here is what happend.
the internal transmission line pressure is adjusted by the EPC solenoid, this solenoid is controlled by PWM "pulse with modulation" which simply means that the solenoid is turned on and of many times a second, the longer the on time the lower the pressure the longer the off time the higher the pressure, this on off on off rythem creates a fluid pressure pulse in the system.
now when your on the highway at cruising speed the transmission goes into lock up operation, the tcc valve is in the valve body, the valve is a high strength metal valve and the valve body is constructed of aluminum, as the tcc valve is acted upon by the pulsed high pressure fluid it will somewhat flutter in its aluminum bore and over time will damage the valve bore causing the lockup to slip a little bit.
the pcm detects the slippage, sets the check engine light and in an attempt to preserve the transmission the EPC is commaned full off which in turn puts the transmission at max line pressure and now you have an extremly harsh 1-2 shift.
have the valve body replaced or allow a transmission shop to remove the valve body **** the tcc valve bore and intall an updated valve.
ps. it will not hurt the transmission if continue to drive it.
Posted on Jun 14, 2009
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Posted on Jan 02, 2017
Tips for a great answer:
Aug 20, 2011 | 1999 Jeep Grand Cherokee
Mar 04, 2011 | 1990 Honda Accord
Apr 07, 2010 | 1999 Dodge Ram 2500 4WD
Dec 01, 2009 | 2000 Dodge Intrepid
Nov 11, 2009 | 1997 GMC Sierra
Jun 12, 2009 | 2000 Buick Regal
May 29, 2009 | 1988 Chevrolet K1500
Apr 05, 2009 | 1999 Jeep Grand Cherokee
518 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: