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Hello everyone, I have a 2000 Expedition and have been having a problem with it for about four months now. I start it up and it fires right up but I get in it other times and all it does is turn over. I used to play with the door locks, locking it and unlocking it and it would start but now it wont start that way. The only way I get it to start is by putting my battery charger on it. If I let it sit for a few days without driving it the battery will go dead on me also. I have also noticed sometimes the gauges will sweep over and back and other times they wont. It has all eight new coil packs and I havent checked the fuel pump but you would think it wouldnt be that because of it starting with the battery charger. I also replaced the battery. Someone told me they thought it had something to do with the security system shutting off the fuel pump. Is this possible? Any advice would be very appreciated.
When your gauges sweep over like that it indicates low battery voltage. I would start off by testing your battery and alternator. It sounds like one of them is bad. This can easily be done with a $5.00 volt meter from Harbor Freight. Your voltage should be somewhere around 13.8-14.4 volts while running. After letting the battery sit for a few hours you should have at least 12.6 volts. You should also load test your battery, tool is around $20 at harbor freight or free at the auto parts store. Also make sure to check the connections at the battery terminals.
Thanks for the replies. I just put a new interstate battery in it and new battery terminals. The alternator is working fine. I havent tested the pump. I have AE program. Will this test my fuel pressure? I am still trying to figure out the program. The car has 164,000
There should be a diagnostic mode where you can watch the trucks ecm while you start/run it. It would verify fuel pressure through the rail sensor. Any check engine light? If you have fuel pressure then you need to verify ignition and injector pulse.
It has no check engine light. I will have to plug it in and play around with it I guess. Could it have something to do with the GEM? I just dont understand why i can get it to start every day but it wont start sometime. Now I dont have low beam headlights and my windows dont work. Does the GEM control fuel to the engine so that it just cranks?
The battery going dead sounds like an electrical issue as do the instruments sweeping full scale. You say the battery and alt are good so maybe a grounding problem. You may have several issues ganging up on you.
There should be a diagnostic mode where you can watch the trucks ecm while you start/run it. It would verify fuel pressure through the rail sensor.
I don't think your gonna find a fuel pressure sensor on the 2000 Expy. Prolly best thing is to get a fuel pressure gauge and tape it to the windshield. Check the pressure each time you go to start it. When she no start, check to see what the gauge shows. If it shows adequate pressure, pull a COP and see if you have any secondary spark.
Are you always using the same ignition key to start it?
Thanks for the help. Im going to get a gauge today and check it out. Would the fuel pump be getting weak allowing it to start sometimes? Once it starts it runs great with no problems.
I am using the same key. I only have one key. Are these a coded key?
Would the fuel pump be getting weak allowing it to start sometimes?
If the pump was getting weak you would probably have issues when driving, especially under load. More likely the pump is intermitant. The fuel gauge should show you if the pump is the issue.
Originally Posted by murphym84
I am using the same key. I only have one key. Are these a coded key?
Yes. The key contains a transponder that responds to an inquiry from the PCM. Be sure you don't have a bunch of keys, etc. that could block the transponder's signal to the PATS antenna.
If the pump was getting weak you would probably have issues when driving, especially under load. More likely the pump is intermitant. The fuel gauge should show you if the pump is the issue.
Yes. The key contains a transponder that responds to an inquiry from the PCM. Be sure you don't have a bunch of keys, etc. that could block the transponder's signal to the PATS antenna.
Thats one of the little quirks my truck has-- it starts and drives without the PATS key and I was never able to figure that out
My wifes Expedition is having a similar issue, except the battery does not drain and the gauges don't sweep. Subscribing. Hopefully we both can find a cure.
This is probably dumb, but have to ask... I know you said you put a new battery in it and everyone is pointing to different things. But recently had something similar happen to my Jeep and after everything else it was the battery. Just got a bad one, even though new. Weird things with gauges, rear hatch cycling like it was stuck anf then when it stopped the lights and gauges showed good. So probably too easy of an answer, but even when we jumped it or charged it, voltage check would come up as good but the minute it was hooked up...no go. Did you take the new battery back to the store and have them verify all cells are good and cold crank, etc? We did, they said it was good but problem cont'd and looked it up on a forum. Everyone said they changed the battery and it worked! Went back to store and they tried to tell me sometimes it's harder to start in cold weather, duh! Anyway, another ew battery and presto-works just fine. Sometimes new batteries aren't good from the get go.
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