98 Grand Prix Tach Problem
agaylord
10-01-2006, 07:42 PM
This is a rare occurance but its starting to weird me out. Sometimes when I'm driving, the tachometer will drop to zero and shortly after, the traction off light comes on. To fix this i put the car in neutral, turn it off, restart it, put it back in drive, and keep going. My car is a 98 Grand Prix GT with the 3800 series II engine. I'm guessing this is a computer problem but i have nooooo clue. any help would be awesome.
richtazz
10-02-2006, 06:51 AM
You have the classic symptoms of a crank position sensor going bad. It's located behind the harmonic balancer on the 3800 series-II.
agaylord
10-02-2006, 06:27 PM
is this the same reason why its starting to stall out at a red light?
BNaylor
10-02-2006, 07:07 PM
is this the same reason why its starting to stall out at a red light?
The crank position sensor generates 18X timing pulses to the ICM for the tach and ignition timing. Another classic symptom is engine stall out.
The crank position sensor generates 18X timing pulses to the ICM for the tach and ignition timing. Another classic symptom is engine stall out.
agaylord
10-02-2006, 07:42 PM
okay i had a free comp. diagnostic done just to be safe and it said the same thing. is this a fix i can do myself?
BNaylor
10-02-2006, 08:57 PM
It can be a DIY job. Sensor may cost around $50.00. See tech procedure in link below. Good luck.
Click here (http://mykidz.net/GTP/CrankPosSensor.shtml)
Click here (http://mykidz.net/GTP/CrankPosSensor.shtml)
Automotive Network, Inc., Copyright ©2026