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
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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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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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How do you fix a fuel pump on 2000 Pontiac Sunfire? Well, I think that is what the problem is...the car turns over but won't start. (battery is new and the starter is fine) It seems like it's not getting...


Yes - that relay could cause your problem. Remove relay and replace with a like numbered relay from the relay box if you have one - if not, buy replacement relay and test. If that doesn't work then the fuel pump is in the gas tank and you'll have to remove ( or at least lower ) the tank to replace. Make sure you empty the tank as best as possible before loosening straps - they are very heavy when partially full. Even 1/4 tank is hefty and difficult to manage.It is also possible your fuel filter is plugged and should be replaced when doing a pump assembly as well as the plastic sock on the pump assembly.

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My 93 cougar like sputters when running. no power, and idles real hard. what could this be?


I'm guessing fuel pump is going. Check for 40 PSI pressure with fuel pressure gauge. Check in engine comaprtment.
Section 10-01: Fuel Tank, Filters, Lines and Electric Fuel Pump 1995 Thunderbird, Cougar Workshop Manual
DESCRIPTION AND OPERATION Fuel Pump, Electric The electric fuel pump:
  • Is part of the fuel pump module.
  • Is located in an internal reservoir in the polyethylene fuel tank (9002) .
  • Is mounted with its inlet at the bottom of the reservoir.
  • Is designed to increase satisfactory pump operation during extreme vehicle maneuvers and steep climbs with low fuel levels.
  • The high-pressure fuel pump module on the 3.8L SFI and 4.6L-2V engines can supply 60 liters (15.9 gal) of fuel per hour at a working pressure of 269.0 kPa (39 psi).
  • The fuel pump module on the 3.8L SC SFI engine can supply 125 liters (29.0 gal) at the same rate and pressure.
  • The fuel pump module has an internal check valve to maintain pressure in the system after the engine is shut down.
  • The fuel pump module also has an internal release valve to provide protection from too much pressure if fuel flow becomes clogged in the fuel filter (9155) , the fuel line is damaged, or other factors.
  • Overpressure is limited to 850 kPa (123 psi) and reduced fuel flow will result if the pressure relief valve is activated.
  • The fuel pump module is protected at its inlet by a nylon fuel filter element (9365) which filters contaminants which could plug or damage fuel pump components.
  • The fuel filter element simultaneously allows passage of small quantities of water which may accumulate within the tank reservoir.
  • The electrical system has a fuel pump control relay in the powertrain control module (PCM) (12A650) which provides power to the fuel pump module through an inertia fuel shutoff switch (IFS switch) (9341) that is normally closed.
  • The electrical system provides power to the fuel pump module through two relays:
    • Fuel pump power relay.
    • PCM power relay.
The current path depends on operating conditions.
  • When the ignition switch (11572) is OFF, contacts of both relays are open.
  • When the ignition switch is first turned to RUN, the PCM power relay energizes and closes its contacts.
  • Power is sent to the fuel pump relay and a timing device in the powertrain control module .
  • The fuel pump module runs through the contacts of the fuel pump relay.
  • If ignition switch is not turned to START, the timing device in the powertrain control module will open ground Circuit 57 after about a second.
  • Opening the ground circuit deenergizes the fuel pump relay, which opens its contacts and de-energizes the fuel pump.
  • The circuitry provides pre-pressurization of the fuel system.
  • When the ignition switch is turned to START, the powertrain control module operates the fuel pump relay to provide fuel while cranking.
  • After the engine starts and the ignition switch is ON, power to the fuel pump module is again supplied through the fuel pump relay. The powertrain control module senses engine speed and shuts the fuel pump module OFF by opening the ground circuit to the fuel pump relay when the engine stops or is below 120 rpm.



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

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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
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Aug 02, 2009 | 2004 Pontiac Sunfire

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


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yadidimean
Thanks Shawn

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