why doesn't my car not want to shift from 1 st to 2nd until it reaches 30 mph, and from 2 nd to 3 rd gear until 55 mph.

10

Asked by Aug 19, 2015 at 02:35 PM about the 1997 Pontiac Bonneville 4 Dr SE Sedan

Question type: Maintenance & Repair

The car shifted fine until I replaced the upper and lower manifold gaskets. the car accelerates great, but doesn't want to shift until the rpms are above 3000 rpm. The tps checked bad so I replaced it and the idle air solenoid. the map sensor checked out good. I would appreciate any suggestions.

3 Answers

20

Probably have a vacuum leak.

1 of 1 people found this helpful.
10

I have check the routing and replaced all the damaged hoses I could find, but it hasn't changed anything. I appreciate the input.

1 of 1 people found this helpful.
69,475

Check any and all wiring that you had to unplug and move aside to do the job. Make sure everything is plugged back in correctly and that all the connections are clean and tight. Some of these things have not been disturbed since the car was made, 18 years ago. Also inspect all the ground straps and connections. Again, make sure they're clean and tight. Is the check engine or service engine soon light on? If so, have the computer scanned. Most auto parts stores will do it for free. Post the codes and then we can help further. Check the MAP sensor for proper seating and a good electrical connection as well as the TPS (Throttle Position Sensor). The computer uses information from these 2 sensors to determine shift points on the transmission, among other things, based on engine load. HTH. -Jim

1 of 1 people found this helpful.

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