1999 pontiac grand prix lost power on highway n now it wont start

SOURCE: 1999 pontiac grand prix gt 3.8L v6 cranks wont start

Is the security light on? If you have spark and fuel, it should run. Any codes? Could be bad crank sensor or cam sensor.

SOURCE: 2001 Pontiac Grand Prix Gt not shifting into OD

this trans is the 4T65E. It needs a 4th clutch hub. The splines strip off around 120k or more because they weren't hardened from the factory. The new ones have the hardened splines. The trans needs to come out and be partially torn down. I've fixed alot of these. Change the EPC solenoid while you are there. They wear and hang up causing intermittent harsh shifts

You can drive them forever without changing the hub but you'll never have 4th gear

SOURCE: Pontiac Grand Prix 94, will not start. Security lighty

try a new ignition switch.

Duane Wong

• 6826 Answers
• Posted on Jul 15, 2010

SOURCE: How to Replace the Starter in a 1999 Pontiac Grand

starter is located on the engine block down below.

Removal & Installation To Remove:
Before servicing the vehicle, refer to the precautions in the beginning of this section.

1. Remove or disconnect the following:
   • Negative battery cable
   • Radiator lower air deflector
   • Torque converter cover
   • Electrical connections from the starter
   • Starter motor

1. Install or connect the following:
   • Starter motor and torque the bolts to 32 ft. lbs. (43 Nm)
   • Starter solenoid BAT terminal
   • Starter solenoid S terminal
   • Torque converter cover and torque the bolts to 89 inch lbs. (10 Nm)
   • Radiator lower air deflector and torque the bolts to 15 ft. lbs. (20 Nm)
   • Negative battery cable

SOURCE: 2004 Pontiac grand prix gtp won't start- fully

it is the alternator brushes cheap and tanks little time to be replace and the brush who is clicking