Question about 2002 Chevrolet TrailBlazer
While driving 55 to 60 the trucks rpms jump up and down from 1 to 2 ... when starting the truck with foot on brake and placing gear to drive it has tried to take off .. what could this be.. it dosnt do it all the time
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Posted on Jan 02, 2017
When the transmission jumps the extra RPM by 200 or 300 RPM. That's your Torque Converter Clutch lock up disengaging or it's slipping. Pull the transmission dip stick out and check the fluid level and condition of the fluid, look to see that it's not burning. If the fluid is not burning then it's the Torque converter clutch unlocking and the Throttle position Sensor may need to be readjusted, or if the transmission is still running off a TV cable. The TV cable may need to be adjusted and or the transmission filter may be dirty and needs to be changed. Take it to a transmission shop and explain to them what the transmission is doing. I'm not sure if your transmission is an 4L80 or a 4L80E. If it's the 4L80E the PCM and ECM control the lock up to your converter. If the PCM detects a problem with the transmission, it drops the transmission fluid pressure to the converter clutch. If it's a 4L80, it's controlled by the TV cable and vacuum lines to the transmission modulator. Regardless they can look in to this when they change the transmission fluid and filter. Recap: Have the Suburban's ECM scanned for any transmission DTC codes. Service the transmission if the fluid is dark in colour and burnt. Adjust any linkage to the transmission that is an issue to it's performance. Good luck and keep me posted, be glad to help.
Posted on Jun 07, 2009
You friend broke the low one way clutch. He was rolling backwards and shifted into drive and floored it before the vehicle came to a stop.
Posted on Jun 29, 2009
SOURCE: I have a 2000 gmc
Sounds like TPS (Throttle Positioning Switch) They develop "hot spots" or wear spots usually at throttle positions that are commonly used alot IE: cruising speed. When they get hot spots they fluctuate looking for solid connection. Replace TPS.
Posted on Apr 04, 2011
SOURCE: my 02 trailblazer jumps in
Sounds like the torque converter is coming out of lockup. A technician with a highend scan tool should take it for a road test to diagnose the condition.
Posted on Aug 15, 2011
Many of the 6 cyl. engines are prone to carbon build-up in the throttle body. If this is the case, it is best to clean it off the car and is fairly easy to do. Remove the snorkel, 1 electric fitting on the throttle body (a little tricky) and one vacuum line on tb as well. Four bolts remove the tb from the engine and the throttle body can be cleaned with throttle body cleaner from any auto supply store. An o-ring attaches the tb to the engine so that you will not destroy a gasket during the repair. Pretty easy and should take less than 1 hour, but be careful of sharp edges in the throttle body.
Posted on Nov 14, 2011
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