Question about 1996 Pontiac Sunfire
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.
Posted on Jul 28, 2009
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this 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.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
May 20, 2018 | Ford Cars & Trucks
on May 23, 2011 | Ford F Cars & Trucks
Jan 14, 2018 | Cars & Trucks
May 19, 2014 | 1996 Jeep Grand Cherokee
Sep 08, 2012 | Ford F-150 Cars & Trucks
Feb 27, 2012 | 1997 Pontiac Sunfire
Feb 09, 2018 | 2000 Chevrolet Blazer
Oct 15, 2010 | Cadillac Brougham Cars & Trucks
Aug 24, 2010 | 2001 Pontiac Grand Am SE
Mar 09, 2009 | 1992 Toyota Celica
460 people viewed this question
Usually answered in minutes!