Question about 2004 Pontiac Sunfire

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2004 Sunfire Problem starting and shutting down on occasion

My sunfire has same problem. Also when it doesn't start the fuel pump relay buzzes.

I replaced fuel filter with better fuel flow after, but engine shut down twice since then. I am going after the fuel pump next, however I think the tank has to be dropped to get to the fuel pump. If this is the case I'm wondering if I have the skill and stuff to do it.

Also when relay for fuel pump swapped with relay for starter (same relay) the problem does not switch to starter. So I assume relay is ok.

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  • Pontiac Master
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Posted on May 12, 2017

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  • Pontiac Master
  • 3,754 Answers

I'd want to check voltage and ground for fuel pump relay. The load side of relay is the line with arrowhead, when relay is energized that line with arrowhead moves to other terminal and sends voltage to fuel pump on gray wire. The control side of relay is that coil symbol, it has to have voltage and ground, the voltage comes from pcm, the ground is a chassis ground. The voltage for load side of relay is fuse protected, fp/inj fuse. 2004 Sunfire Problem starting and shutting down on - fuel pump-mo2osvehtzbwzhstuaetpz2s-2-0.jpg

Posted on May 12, 2017

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

chiquititas
  • 1010 Answers

SOURCE: 1999 pontiac sunfire will not start

Maybe the starter is not notify to the engine.

Posted on Jun 17, 2008

  • 2 Answers

SOURCE: 98 pontiac Sunfire shuts self off

You might not need a tumble, the sys is controled by the key, and transponder, and the ecm. Most auto locks smiths can come out and check the system, might just need a key re-programed

Posted on Nov 14, 2008

kyo0141
  • 15 Answers

SOURCE: Engine Swap

There are several engines that will fit the 2.2l Ecotec, 2.4L high out put motor, and I have actually seen a chevy cavalier that has a 3800 V6 in it if you want to go all out but in most cases sticking with the ecotec motor or the 2.4 High Out Put motor would be best they are two of the best motors for these cars and since the Sunfire is basically the same car as the cavalier almost any thing motor wise is inner change able between cars depending on the motors i own an 2004 chevy cavalier LS sport and a buddy of myn has a 2004 Pontiac Sunfire and both have the 2.2L Ecotec and are both Manual trans and even most of the interior parts are the same except for some of the dash board components hope this helps you out

Posted on Dec 29, 2008

csmock132
  • 4669 Answers

SOURCE: Problems In a cylinder of pontiac sunfire

What engine? Does it have good compression?

Posted on Mar 08, 2009

Molson02536
  • 3854 Answers

SOURCE: 95 sunfire engine swap

It will fit but your going to have to do a lot of engine management retrofit to have your engine run right unless you have the ECM for the engine also. Good luck and hope this helps. 

Posted on Jul 01, 2009

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1 Answer

Where is the fuel pump shut off switch located in a 2000 pontiac sunfire


GM doesn't use a fuel pump shut off switch, the safety system works like this, fuel pump is turned off if the engine oil pressure goes to zero with the key in the run position. Ford uses a shut off switch that is activated by an impact exceeding 3 G's (3X the force of gravity), it is called the fuel pump shut off inertia switch.

Aug 24, 2011 | 2000 Pontiac Sunfire

2 Answers

Fuel relay buzzing, no start


I'm having the same problem. What did it end up being?

Feb 14, 2010 | 2004 Pontiac Sunfire

2 Answers

2004 sunfire, engine will crank but wont start, could it be anything besides the fuel pump? There have been no advanced warnings.


CHECK 20 AMP IGNITION FUSE.AND CHECK FUEL PUMP AND FUEL INJECTOR FUSE.IF ALL IS GOOD HAVE CAR SCANNED A FAULTY CRANK SHAFT SENSOR OR OPEN EGR VALVE.OR FAULTY PCM WILL CAUSE NO START PROBLEMS.ALSO ANTI THEFT SECURITY SYSTEM WILL SHUT DOWN CAR.WHEN YOU HAVE IT SCANNED IT WILL TELL YOU THE ANTI THEFT SYSTEM IS THE PROBLEM..

Jan 23, 2010 | 2004 Pontiac Sunfire

2 Answers

Sunfire will not start, it started for a second or two then quits could it be the fuel pump or ecm or anti theft shutting the fuel pump off i am totally baffled, 2002 pontiac sunfire


Have somebody listen at the gas cap for a buzzing sound when the ignition switch is turned on, or if you can hear it, it only does it for a few seconds, if you don't hear it, the pump is bad and the gas tank has to be dropped to change it.
This is not recomended, but I do it all the time to make sure the problem is in the fuel system. Spray a little bit of starting fluid in the intake, if it starts, the problem is in the fuel system, but listen for the buzz sound first.
Other problem could be a clogged fuel filter, or a faulty fuel pressure regulator. Have a fuel pressure test done, that would also reveal the problem, if it's a fuel problem.

Sep 18, 2009 | 2002 Pontiac Sunfire

2 Answers

Why is the fuel relay buzzing and car won't start? the dash lights are flickering on and off, and the relay buzzes for like 3-5 seconds, and the startes just keeps trying to turn over the engine. it...


sounds like originally your alternator is over charging causing dash lights to come on and flicker while driving then battery is flat(low) causing problem when starting
jump start engine, check alternator charge rate, and get battery recharged and then checked(load tested)

Aug 02, 2009 | 2004 Pontiac Sunfire

1 Answer

Car want crank over


This is Caused by the Fuel Pump. If you remove the Fuel Pump relay and it will try to Crank, You have a Bad Fuel Pump. I do Believe that the Fuel Pump is located inside the Fuel Tank on the Sunfire. Not an easy Repair But, Necessary

Jan 24, 2009 | 1998 Pontiac Sunfire

1 Answer

My 1997 sunfire wont start. the engine will turn over.


its a sunfire , have a buddy sit in your car and you go to the back have him turn the key to the on position... not the run position and listen for a buzz or whiiirrrrrring sounds, do this several times if no noise chances are your fuel pump is dead, a common chev problem, if it has no noise you can try giving it a few good whacks where the fuel pump is located at the tank and try again more often than not this will get your fuel pump buzzing again and then you will know if your problem is at least in the front or the back..
yadidimean
Thanks Shawn

Jan 05, 2009 | 1997 Pontiac Sunfire

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