Hard Starting 3.0
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Hard Starting 3.0
I have a 97 Taurus GL 3.0 I have been having starting problems. It started about 6 months ago. It used to barely turn over before it would start. Once the car is started it runs great, no ping misses runs really smooth. The problem is getting it started. It will take several attempts to get it started. It does it worse when it’s cold, but it doesn’t start easy when it is warm. I have checked the spark it appears to be slow to intermittent when the motor is turning over. I have replaced the cam sensor reset the computer, changed plugs and it appears to have good fuel pressure.
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Any ideas?
<?xml:namespace prefix = o ns = "urn:schemas-microsoft-com
fficeffice" /><o></o>Any ideas?
Post Fiend
Joined: Jan 2003
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From: Connecticut
Welcome to FTE!
Under what condition(s) did you check the fuel pressure? Maybe it takes a while for the fuel pressure to build. Have you tried turning the ignition key on and off several times before attempting a cold start? This will cause the fuel pump to "cycle" which will allow for the system to build adequate pressure before you actually start trying to crank the engine over.
Under what condition(s) did you check the fuel pressure? Maybe it takes a while for the fuel pressure to build. Have you tried turning the ignition key on and off several times before attempting a cold start? This will cause the fuel pump to "cycle" which will allow for the system to build adequate pressure before you actually start trying to crank the engine over.
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I tried turning the key on for about 2-3 seconds 3 times this morning. It seemed to help, but it still took longer than it should to start. I will put a gage on it this weekend and post the actual fuel pressure and how quickly it takes to get to that pressure. Is there a check valve in the fuel pump that keeps pressure in the system? I will repost as soon as I can.
Thanks
Thanks
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I checked my fuel pressure. With the key off the pressure is 0 once the key is turned on it goes to 18 - 30 lb’s for about 1 second then quickly goes to 0.
When I start the car the pressure runs a steady 30. When I take the vacuum hose off the pressure regulator it jumped to about 40. As soon as the key goes off the pressure goes to zero. Is this the fuel pressure regulator? There is something in the return line that does not have vacuum to it. What is it and what does it do?
Thanks
When I start the car the pressure runs a steady 30. When I take the vacuum hose off the pressure regulator it jumped to about 40. As soon as the key goes off the pressure goes to zero. Is this the fuel pressure regulator? There is something in the return line that does not have vacuum to it. What is it and what does it do?
Thanks
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
The pressure specs sound OK, but the pressure should hold steady (within 5 psi) for at least one minute once the key (i.e., the pump) is turned off. So there is some definite leakdown going on. Either the FPR is shot, or there is a leak somewhere else in the fuel delivery system (injectors?). Is there any fuel in the FPR vacuum line when you pull it off after shutting the engine off?
Post Fiend
Joined: Jan 2003
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From: Connecticut
I doubt it's the injectors then, if the plugs aren't wet.
Is the FPR vacuum line connected on both sides? The other end should be connected to a port coming off the back of the upper intake manifold, right underneath the DPFE sensor.
Is the FPR vacuum line connected on both sides? The other end should be connected to a port coming off the back of the upper intake manifold, right underneath the DPFE sensor.
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Yes its is connected. What is the thing that splits the return line and does it have anything to do with it holding pressure?
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Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
The fuel pump assembly has a discharge check valve that maintains system pressure after the key has been turned off. It's really the responsibility of the check valve to hold the pressure. The fuel pressure regulator can cause a leakdown of pressure, but it's specific role is really to regulate fuel pressure when the engine is running. If the FPR is not leaking fuel, then it sounds more like a check valve issue. As noted, the check valve is a part of the fuel pump assembly which is mounted in the fuel tank.
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