Question about Cars & Trucks
Check the vacuum hose from the manifold to the transmission actuator
check the actuator for operation if it is a sealed transmission( gm do not recommend oil changes in transmissions )and it is close to he 60,000 miles mark or longer , then an oil change by an accredited transmission specialist shop would be in order
while there, they could run a fault code check to see if there are electronic problems
Posted on Apr 16, 2017
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Posted on Jan 02, 2017
SOURCE: Where is the vacuum hose
IF the engine was revving high RPMS it had to be a serious vaccum leak. If the PCV came undone it would cause it rev up quite high. the shaking was from the factory set RPM limiter when not in gear (around 4,000 RPMS) the only other vaccum leak big enough would be for the brake booster. They both have a check valve but that doesn't mean much. I would start there PCV is around 5 bucks and the other is about the same. If you need pics of location I could do that also.
Posted on Sep 15, 2008
There are diagnostic tools that could help detect what your problem is. The Snap-On Modis, or preferably a "Tech-2" GM scanner. Any reputable transmission shop, or GM dealer should have at least one of the two. It sounds to me like it could be the transmissions "EPC" (Electronic Pressure Control solenoid) The EPC controls main line pressure, in an effort to keep shift firmness, and shift duration at one specific level. This is to compinsate for the natural wear a transmission encounters, and to keep emissions as low as possable, by keeping shift duration low. When the EPC malfunctions (and thats somthing that they like to do in the 4t65E), it typically starts to shift harder than normal. They typically throw a P1811 code. (P1811 is a "max adapt-long shift" code) And the malfunction can be intermittent. Hope this helps, and good luck.
Posted on Apr 19, 2009
SOURCE: hard shifting Impala, sometimes.
Sounds like the vacumn modulator isn't connected. Like the hose has come off, or there is a tear in the hose. (4t60-E transmission)
4t65-E transmission is a different ballgame. Check the electrical connector to the side of the tranny. Make sure it's plugged in tight, and there is no corrosion on the connectors. Past this point it's time to check sensors. WSS, (Wheel Speed Sensor), and VSS, (Vehicle Speed Sensor)
Make sure these connections aren't corroded, and are on tight on both transmissions.
(Don't know which one you have. 4t60-E, or 4t65-E. I suspect you have the 4t60-E. It will state this on the transmission oil pan in raised letter/numbers)
Posted on Jul 09, 2009
The blower motor resistor is located behind the glovebox mounted in the fan housing box under the dash.
Posted on Jul 20, 2009
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