why does my 1999 pontiac grand prix loss all power when the tempature light comes on

Asked by Jul 06, 2013 at 09:02 AM about the 1999 Pontiac Grand Prix 4 Dr SE Sedan

Question type: Maintenance & Repair

i have replaced the EGR valve, thermastat, thermastat censor, water pump, low coolant censor.. My car is NOT running hot but when driving as soon as the tempature light comes on the car losses all power.

2 Answers

158,845

Check your battery connections. A loose or dirty connection can also cause this type of issue.

158,845

Found this thread on another site. Might be same issue as yours ---My 1999 Grand Prix has been acting up with all the same symptoms many people described. Engine cut out at highway or low speed; hard to start after a hot shut down; the Trac light stayed on after the engine cut out and immediate restart in neutral etc. It was getting worse lately with the hot weather. I contemplated replacing the crank position sensor, mass air flow sensor, PCM one at a time, and hundreds of $ at a time, like many people before me. Then, I found the way to fix my problem at ZERO DOLLAR! I figured that it could be a voltage problem. I used a multi-meter. I measured the voltage across my battery, which show the normal 12.7 V. But from the positive terminal junction to a good ground on the engine (e.g. Al engine mount) the voltage has dropped down. I also measure the conductivity as well, and I did not get zero Ohm between the negative terminal to the good ground spot on the engine. I removed the grounding cable attached to the body panel and found that it was bolted on to a part with original body paint! What a bad design! Paint is not the best conductor in the world! After years of dirt and rust build-up, the conduction between the bolt threads won't be as good as before. So you get intermittent voltage drops that stalled the engine. I gave the contact a good rubbing with sand paper. I check voltage and conductivity after and it was good as you would expect. Since than, I never had a single staling. It has been three weeks with lots of kilometers in hot weather. I trust that the same remedy will solve a lot of your problems. I apologize to many garages for reducing tens of thousands of dollars of their potential business.

Your Answer:

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    6,370
  • #2
    munron
    Reputation
    4,920
  • #3
    Dorian Hendricks
    Reputation
    3,500
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Chevrolet Impala
48 Great Deals out of 935 listings starting at $1,995
Used Chevrolet Monte Carlo
10 listings starting at $4,612
Used Pontiac Grand Am
19 listings
Used Honda Accord
50 Great Deals out of 1,935 listings starting at $1,995
Used Ford Mustang
51 Great Deals out of 1,861 listings starting at $3,987
Used Jeep Grand Cherokee
92 Great Deals out of 4,661 listings starting at $4,250
Used Pontiac Firebird
22 listings starting at $18,900
Used Chevrolet Malibu
63 Great Deals out of 2,091 listings starting at $1,700
Used Chevrolet Camaro
39 Great Deals out of 1,046 listings starting at $9,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.