Does this mean the PCS can only ever be in 1 of 2 positions? Your transmission requires hydraulic pressure to connect the power between the engine and your wheels. Forward Abuse Bore Plug22. This drop-in precision USA-made steel valve is design to provide full-time line-to-lube, as well as restoring the hydraulic integrity of the circuit without the need to machine the bore. Low spring rates, incorrect spring heights and inappropriate replacements from previous rebuilds can lead to low base line pressure. We'll show you how we tuned a 4L65E to give us both a much more aggressive downshift schedule as well as a much cleaner and smoother short-shift schedule at light throttle that saved us a bunch of fuel during part-throttle cruise. If the early shallow filter is installed it will fall off causing low pressures and slippage. Erratic line pressure; Low line rise; 1-2 Harsh; 2-3 Shift feel poor; Poor shift quality; Code 894, 1870; Falls out of lockup when hot; No lockup; TCC slip Exhausting apply pressure also diminishes line pressure, which can result in burnt clutches. Excess wear at the isolator valve bore reduces TCC apply pressure. So, I've been researching and I read that it may be caused by low line pressure and a quick test is to unplug the Throttle Position Sensor and take the car for a short quick drive. This precision USA-made steel oversized valve is design to provide full-time line-to-lube, as well as restoring the … This is a primary cause for TCC-related slip code P1870 and overheated converters. I found the following Tech Tip for the 4L60E: "General Motors 4L60E Preventive Maintenance Tip The pressure regulator boost valve and it's sleeve should be replaced every 40,000 miles to avoid major damage that occurs when accumulated wear in the boost sleeve causes insufficient pressure to be made available in reverse. Symptoms: Wrong gear starts Solenoid performance codes Erratic line pressure Clutch failure Band failure No 4th Harsh shifts 2nd Gear starts Cause: Actuator feed limit bore wear results in low pressure at shift and EPC solenoids. I was under the impression that the PCS would be post width modulated to get more varying fluid pressure or is this just not the case. 4L60E Manifold Pressure Switch. In reverse 600-800 psi is common. The first is a dynamometer test that reveals low line pressure during boost conditions (look for 50-100 psi less than specified in Reverse). lock up clutch not working will cause serious overheating and burnt clutches as well. Line pressure booster kit 4L60E-LB1 fits early-style GM 4L60-E, 4L65-E and 4L70-E pumps. This is LINE PRESSURE that is coming from the pump, when in drive ranges from Min: 55-65psi to Max:170-190psi from factory. The second is vehicle symptoms such as clutch slippage, reverse chatter, and 3-4 clutch failure. Mechanic's Assistant: Besides this, what condition is the car in? Runs pretty good has misfire code but you cant feal a miss, the mass air flow boot has a cut in it. For the same reason, the symptoms will vary as well, ranging from harsh shifts, soft shifts, burnt frictions, overheating, to converter clutch failure. Reconditioning the bore and installing Sonnax TCC regulator and isolator valve kit 77754-03K restores normal TCC operation by shoring up the hydraulic integrity of this circuit. To put it in layman’s terms, a pressure manifold switch is a part of the transmission that attaches to your valve body which tells it what gear that it’s in. Whats people lookup in this blog: 4l60e Transmission Cooling Lines; 4l60e Transmission Cooler Lines Diagram Check clearance between pan and filter. 3. New rebuilt 4l60e has low line pressure in all gears but rises with rpm, it does hesitate going into all gears. Sonnax Line Pressure Booster Kits Low EPC/Torque Signal Pressure High Low Line Pressure Check for Wear • If pivot is worn, replace with Sonnax pivot ... 4L60E-LB2 4L60-E, 4L65-E, 4L70-E** 700R4-LB1 4L60 (700-R4), 200-4R 400-LB1 400 4L80E-LB1 4L80-E, 4L85-E 4T65E-LB1 4T65-E 350-LB1 350 Symptoms: Low base line pressure; Cause: These readings can be obtained by attaching a 300 psi fluid pressue gauge to the appropriate pressure port on … I unplug the sensor, and sure enough, reverse works great, shift through the gears (only got into 3rd) and it's pretty damned firm, but it does shift quickly and well. This in turn has an effect on exactly how much pressure is going through the lines of the 4L60E at any given time. Stethoscoped it and the noise is either the torque converter or the front trans pump. I found this recently on a Nova with a 4l60e … On the other hand, in those cases where the wear is most prevalent at the spring end of the valve, the leak in that area would cause low line pressure. Reconditioning the bore and installing Sonnax TCC regulator and isolator valve kit 77754-04K restores normal TCC operation by restablishing the hydraulic integrity of this circuit. Low HI RPM pressure and undesired 3-4 clutch apply when the car is not in 3rd gear will result in burning the clutch. The transmission setup tab and the Shift Parameters tab, I can make adjustments easily. MAX RPM for a stock 4L60E/65 should be no more than 6000 rpm. Hi All, I just would like some clarification about the 4L60E experts here on the forum. Exhausting apply pressure also diminishes line pressure, which can result in burnt clutches. 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