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

110,065

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

110,065

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

Add photo

Related Questions

  • Engine power loss and sputtering 45 answers

    It seems like I have a loss of power when accelerating and driving around 50-60 mph at ~2k rpm. The car also sputters and rpm begins to fluctuate while driving. Is the fuel injector bad or clogged and...

    1995 Pontiac Grand Prix 2 Dr SE Coupe

    -

    Maintenance & Repair

  • 2004 Pontiac Grand Prix Ask me any questions 39 answers

    I have totally replaced and rebuilt this car. I have experienced some major obstacles and solved them. I have experience with this year model Grand Prix. I may be of some help to others.

    2004 Pontiac Grand Prix GTP

    -

    Maintenance & Repair

  • 2007 pontiac grand prix

    Why do the lights keep coming on and off in my 2007 pontiac grad prix when its not cranked?

    2007 Pontiac Grand Prix Base

    -

    Maintenance & Repair

  • Reduced engine power on a 2008 Grand Prix 77 answers

    I have a 2008 Grand Prix, that worked great until last march when i put it in the ditch. it got all fixed from that. But just this past week i was driving it and it came up with REDUCED ENGINE POWER...

    2008 Pontiac Grand Prix Base

    -

    Maintenance & Repair

Search Pontiac Grand Prix Questions

Pontiac Grand Prix Experts

#1 Js08016
Js08016
Reputation 4,160
#2 Tom Demyan
Tom Demyan
Reputation 2,830
#3 munron
munron
Reputation 2,180
View All

Related Models For Sale

Used Chevrolet Impala
521 Great Deals out of 31,726 listings starting at $1,450
Used Pontiac Bonneville
3 Great Deals out of 533 listings starting at $1,799
Used Pontiac Grand Am
1,215 listings starting at $1,999
Used Chevrolet Monte Carlo
21 Great Deals out of 1,408 listings starting at $1,995
Used Ford Mustang
476 Great Deals out of 45,735 listings starting at $1,999
Used Chevrolet Malibu
948 Great Deals out of 79,656 listings starting at $1,500
Used Chevrolet Camaro
225 Great Deals out of 30,943 listings starting at $1,217
Used Ford Taurus
248 Great Deals out of 20,434 listings starting at $699
Used Honda Accord
813 Great Deals out of 84,287 listings starting at $1,050

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
17 Great Deals out of 429 listings starting at $1,500
2007 Pontiac Grand Prix For Sale
4 Great Deals out of 392 listings starting at $2,500
2006 Pontiac Grand Prix For Sale
456 listings starting at $2,675
2005 Pontiac Grand Prix For Sale
5 Great Deals out of 351 listings starting at $1,895

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.