Question about 1999 Pontiac Sunfire

1 Answer

99 sunfire has trouble starting at times o ring replace fuel pump also and oxygen ensors fixed what is the problem

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Pontiac Master
  • 2,184 Answers

Sometimes the anti theft can disengage the starter and/or injectors. This is a common problem on GM vehicles. Read this link, it might help ya out. http://vatspasslockpasskeysecurityhelp.yolasite.com/

Posted on May 29, 2011

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

99 suburban fuel pump wont seal


You need help pushing it down against the O-ring,
while you install the lock ring

Mar 21, 2013 | 1999 GMC Suburban

1 Answer

Have changed to crankshaft sensor the oxygen sensor spark plugs and wire and wont start even when it is turning over


Borrow a fuel pressure tester from Auto Zone and test the fuel system. It could be that you have a bad fuel pump or fuel pressure regulator. It also could be a plugged fuel filter.

Mar 14, 2013 | 2000 Pontiac Sunfire

1 Answer

97 pontiac sunfire 2.2L engine has trouble starting when engine is cool I have to give it a little gas to start it but when engine is hot starts just fine. Had fuel injector cleaned and a induction replace...


po141 code is downstream oxygen sensor heater or circuit fault. that should not keep it from starting cold...but cars are funny like that!!
i would get that fixed and go from there

May 27, 2011 | 1997 Pontiac Sunfire

1 Answer

My 1996 sunfire will not start when it is hot outiside. we have replaced oil filter, cleaned air filter, new plugs, new oxygen sensor and still not starting when hot outside.


Get in the car with your door open and listen to the rear of the car, when you turn on your ignition do you hear a humming sound coming from the fuel tank for a couple of seconds? If not, it could be your fuel pump trying to fail. Also your ignition coil could be the problem too.

Aug 10, 2010 | 1996 Pontiac Sunfire

1 Answer

99 sunfire is not gettin gas to the motor it was run out of gas bout week n a half ago any answers


it sounds like the fuel pump needs to be replaced
the fuel pump is an electric motor the fuel in your tank keeps it cool but when you run the fuel dry the pump overheats and can seize

Dec 21, 2009 | 1999 Pontiac Sunfire

1 Answer

Low gas pressure in 96 sunfire. Replaced the oxygen sensor, vacuum hose, fuel pump and fuel filter. Fixed the ignition regulator. When I shut off the car it sometimes fires right up right away. It used to...


You have mentioned that you replaced the O2 sensor. The oxygen sensor is completely ignored by the engine computer while the car is starting, and doesn't come into play at all until the engine warms up completely. Are you sure you have a fuel pressure problem? If so, replacing the O2 sensor would not have any affect.

To be sure you have a fuel pressure problem, you need to measure it. This car does not have a fuel pressure test port, so you need an inline fuel pressure test gauge. To test the pressure, connect an in-line gauge and switch your ignition switch to the "run" position. (Do not start the engine.) The fuel pump should run for two seconds. During this time when the engine is not running, you should have between 41 and 47 PSI of fuel pressure. If you start the engine, the fuel pressure should drop somewhat at idle (maybe somewhere closer to 28-35 PSI). Fuel pressure is regulated according to intake manifold vacuum, so at idle, it should be fairly low, while at higher throttle settings, it should be higher.

From what I gather, your car cranks for a long time before starting. If you suspect low fuel pressure, a defective fuel pump relay could cause that condition. The relay is located in a relay/fuse box under the hood on the driver's side of the car. If the relay fails, the fuel pump can still be energized by the engine oil pressure switch. This switch closes when engine oil pressure reaches ~4PSI. If your engine is not producing 4PSI of oil pressure while cranking, or if it takes a while to reach 4PSI, that would explain your problem.

Jul 27, 2009 | 1996 Pontiac Sunfire

1 Answer

2003 Sundifre won't STAY running


The gauge problem sounds like the common issue on the 03-05 Sunfire instrument clusters where the stepper motors on the cluster's circuit board fail over time. It can be fixed, check out this page for more on how to get it repaired - Sunfire instrument cluster fix

Jun 16, 2009 | 2003 Pontiac Sunfire

2 Answers

Fuel gage Not reading accurate fuel level


sounds like you got a malfunctioning float on your fuel pump (works like a toilet bowl) try adding magellans mystery oil (you can find it at most part houses like napa ect) to you fuel for a few tanks to see if it can loosen things up if not probably going to need to replace the part

Dec 04, 2008 | 1999 Pontiac Sunfire

1 Answer

Trouble Starting


You need to check to see if the fuel pressure bleeds down, hook up a guage to the fuel rail port, turn key on for a moment then turn it off, the fuel pressure should not drop more than 5 PSI in 24 hours, if it does the fuel pump check valve is defective, this allows the fuel lines to drain down and causes long cranking to start. You will have to replace the pump to fix this problem.

Jul 22, 2008 | 1997 Pontiac Sunfire

Not finding what you are looking for?
1999 Pontiac Sunfire Logo

153 people viewed this question

Ask a Question

Usually answered in minutes!

Top Pontiac Experts

yadayada
yadayada

Level 3 Expert

75117 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22095 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

7772 Answers

Are you a Pontiac Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...