My 05 Trailblazer has what I would call a surging problem. It will intermittently surge at speeds between 45 - 65 mph and 1,500 to 2,500 RPM. Took it in to the shop for repair; camshaft position sensor and both O2 sensors were replaced but the problem is still there. I have noticed that when the surge occurs the RPM will drop by about 300 for a second or two then jump back up. Is this an engine problem or transmission problem?
Thanks for the input. You'r the third person to recommend that I replace the TPS. I'll give a try.Thanks for the input. You'r the third person to recommend that I replace the TPS. I'll give a try.
I know the symptom well, just replaced one on my Land Rover and it did EXACTLY the same as you described.I know the symptom well, just replaced one on my Land Rover and it did EXACTLY the same as you described.
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sounds a little like a cruise control problem. they used to have a centering adjustment that kept the speed within a range. If the range somehow shifted to the high end this would cause your surge. it would be a screwdriver slot on the outside of the case.cw increase ccw decrease. yours is set too high or cw. I work the screw back and forth several times in case dirt entered the cruise module.
SCAN IT FOR VSS CODES AND. TRANSMISSION CODES.FOR TORQUE CONVERTER FAULT CODES OR SHIFT VALVES CODES.IF ALL IS GOOD TRANSMISSION GOVERNOR COULD BE CAUSING PROBLEMS.
ok a couple of things to try one is loosen the throttle cable so it has a little play in it and then you can check for vacume leaks using carb cleaner if rpms change you have a leak
Its a loose connection on the speedo cable. its a b*tch to get to. I had the same problem on my truck, it would fluctuate in 5th gear on the highway. i spent the money and had a professional do it.
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