Question about 1999 Pontiac Sunfire

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1999 Pontiac Sunfire stalls in hot weather and will not restart for about 5 or 10 minutes. Will continue to do this until car sits for a while.

Lived in Florida for the past eight years and this was a real problem on long trips or after driving more than 20 minutes in hot weather. Very annoying...wonder if this is something other people have had a problem with. Recently drove from FL to MA and it happened several times on the highway (in busy highway traffic). Not good! Thank heavens for AAA. Since I have been in MA it has not happened once. Any ideas?

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  • 62 Answers

On some of these motors the crank position sensor goes bad when it heats up I would replace that first

Posted on Jul 25, 2017

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Posted on Jan 02, 2017

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SOURCE: 88 pontiac 6000 shudders and stalls after approx. 30 min. driving

What was replaced in the tune up? Usually the coil paks cause these types of issues. Also fuel filter or fuel pump will allow enough fuel to start and sputter like you describe.

Posted on Jun 16, 2009

  • 236 Answers

SOURCE: 1996 Pontiac Sunfire, code reads too lean, bank 1

you may have a faulty ECM

Posted on Jul 09, 2009

  • 318 Answers

SOURCE: My 1999 Pontiac Sunfire shut off while i was driving on FWY

You could have a bad alternator and are running off the battery voltage. This is just one possibility tho.

Posted on Jul 18, 2009

  • 242 Answers

SOURCE: 2005 Pontiac Aztec has an intermittant engine

Next time this happens, reach up and try to turn the key like you are trying to start. It shouldn't engauge starter while in gear so don't worry about that. If it starts up when you do this, you most likely have a weak switch and the weight of your keys swinging may me shutting you down.

Posted on Aug 28, 2009

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  • 31 Answers

SOURCE: My 2002 Pontiac Montana has issues starting in hot

check your temperature if it goes up quite fast you have a problem with your radiator or water pump, but if it is ok check your battery and alternator...

Posted on Aug 17, 2010

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1999 sunfire will start but stalls after a minute or so. turn key back to on position and can hear fuel pump then can start it again but only runs for a minute then stalls again


Assuming the pump relay is good, it could be the engine computer or something else. The computer needs to see oil pressure or RPM to continue to energize the pump relay. You could jumper the relay to verify.

Jan 27, 2014 | 1999 Pontiac Sunfire

2 Answers

My 2002 Pontiac Montana has issues starting in hot weather. If it hasnt been driving for a while it starts and runs fine but the once you stop somewhere then theres a chance it wont start again. Actually...


check your temperature if it goes up quite fast you have a problem with your radiator or water pump, but if it is ok check your battery and alternator...

Aug 17, 2010 | 2002 Pontiac Montana

1 Answer

I have another problem with my 1999 Pontiac Sunfire. after driving it for 5 minutes or so, it will stall, and not restart. If I wait 5 minutes or so, it will eventually start. I did notice one of the coil...


REPLACE THE COIL PACK BUT I AM LOOKING AT IGNITION SWITCH TO KEY LOCK CYLINDER.THIS COULD CAUSE CAR TO TURN OFF.THIS WILL DISABLE POWER TO IGNITION SWITCH.

Nov 09, 2009 | 1999 Pontiac Sunfire

3 Answers

What kind of oil does a pontiac sunfire take?


YOU CAN USE PENNZOIL OR VALVOLINE HAVOLINE 5W-30 IN WINTER OR 10W-30 IN SUMMER.

Jul 28, 2009 | 1999 Pontiac Sunfire

1 Answer

My 1999 Pontiac Sunfire shut off while i was driving on FWY


You could have a bad alternator and are running off the battery voltage. This is just one possibility tho.

Jul 17, 2009 | 1999 Pontiac Sunfire

1 Answer

Engine hesitates or stalls


This might be what we call vapor lock try driving with your gas cap off and see if it still quits under the same conditions.

Jun 17, 2009 | 1999 Pontiac Sunfire

2 Answers

1992 pontiac boneville, keeps stalling


Have you chg.fuel filter and had a fuel pressure test done? Does it have spark after it stalls? Fuel pumps are a common problem, they work when cold get warmed up they quit, after a while quit all together. Do the fuel pressure test.

May 05, 2009 | 1995 Pontiac Sunfire

1 Answer

My 1999 pontiac sunfire won't start sometimes


so you changed the air temp sensor because ginko wrote the same thing in solution 8 how about coolant temp sensor

Mar 23, 2009 | 1999 Pontiac Sunfire

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