Surge problem in Overdrive?
11-28-2006, 07:07 AM
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Staging Lane
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Join Date: Aug 2005
Location: Lincoln, NE
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Surge problem in Overdrive? This is not an LS1 question, but I was hoping maybe someone could help me with this? Here is the situation with my 2000 Grand Prix GTP:
In overdrive with the torque converter locked up at highway speeds (50-70mph) this is most common. With or without the cruise on when you lightly depress the gas pedal say going up a hill or just accelerating, just before the converter should unlock or the tranny should down shift I get a bad surge, say about 500 rpm's back and forth until I push the gas pedal past this point a little farther or tapping it hard to force the converter unlock/tranny shift. Any ideas what might be causing this? There is a TSB on this issue for non super charged cars, I tried anyway, it was to replace the TPS sensor, but it did not help? I know these cars have a 2 stage fuel pump with a resistor built in to the system that controls this, and the other day the fuel pump fuse blew, I replaced it and have no issues with the fuse since, don't know it is related, but thought I would throw it out there.
Thanks.
In overdrive with the torque converter locked up at highway speeds (50-70mph) this is most common. With or without the cruise on when you lightly depress the gas pedal say going up a hill or just accelerating, just before the converter should unlock or the tranny should down shift I get a bad surge, say about 500 rpm's back and forth until I push the gas pedal past this point a little farther or tapping it hard to force the converter unlock/tranny shift. Any ideas what might be causing this? There is a TSB on this issue for non super charged cars, I tried anyway, it was to replace the TPS sensor, but it did not help? I know these cars have a 2 stage fuel pump with a resistor built in to the system that controls this, and the other day the fuel pump fuse blew, I replaced it and have no issues with the fuse since, don't know it is related, but thought I would throw it out there.
Thanks.
