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 Posted:5/5/2005 19:37 |
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I have a 2000 V10 Excursion that I purchased a few month's ago. A mechanic friend of mine has been trying to figure-out why my Excursion sometimes won't start. He has replaced the fuel pump, which at the time he thought was bad because we had no knowledge of this intermittent problem. He also replaced a relay which turns the fuel pump on. There is plenty of power, the engines turns very fast but acts as if it doesn't get any gas when it won't start. This has happened 3 or 4 times in the past three months but my mechanic has never had the X in this state in order to troubleshoot the problem. He drove it for three weeks with no problems. Anyway, if anyone has a clue as to what the problem could be I would appreciate any help. Does anyone think it could be the computer module? If so, does anyone know how much the computer module costs? If anyone has had this problem please ley me know how you resolved your problem.
Any help is appreciated.
Thanks,
Roger |
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Posted:5/5/2005 20:32 |
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Is there any Add-on Anti-theft devices installed from the prior owner?
Could be the Inertia fuel shutoff switch,could be a hungup code in the PCM,the throttle position sensor could have issues,etc
I suggest a code scanner and see what it comes up with.
Lemme know what codes if any are found.
Bill
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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LANDYOT
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• Subscriber since 11/23/2003 |
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• Newport News, VA, USA |
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• Registered on 7/15/2003 |
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• 1,110 posts |
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Posted:5/6/2005 05:05 |
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Even though they typically act up only when it's very cold, take a look-see at your IAC (Idle Air Control) valve. |
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Posted:5/6/2005 08:44 |
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Quoted from Ford Dealer Service for a thorough explanation on the IAC functions;
| Quote: | The idle air control (IAC) valve assembly Figure 117 and Figure 118 controls engine idle speed and provides a dashpot function. The IAC valve assembly meters intake air around the throttle plate through a bypass within the IAC valve assembly and throttle body. The PCM determines the desired idle speed or bypass air and signals the IAC valve assembly through a specified duty cycle. The IAC valve responds by positioning the IAC valve to control the amount of bypassed air. The PCM monitors engine rpm and increases or decreases the IAC duty cycle in order to achieve the desired rpm.
On applications with air-assisted injectors, the IAC valve (Figure 119)also supplies a small amount of air into the path of the fuel injectors. The jet of air causes an increase in fuel atomization at low speed and light load conditions.
Note: The IAC Valve Assembly is NOT ADJUSTABLE and CANNOT BE CLEANED.
The IAC valve (part of throttle body assembly) has an internal diode on some applications. If the internal diode is measured in crossed terminal position with a digital multimeter, there will be an incorrect or negative reading. It is important that the mating component and harness connectors correctly oriented. Diagnostic procedures emphasize this importance.
The PCM uses the IAC valve assembly to control:
No touch start
Cold engine fast idle for rapid warm-up
Idle (corrects for engine load)
Stumble or stalling on deceleration (provides a dashpot function)
Over-temperature idle boost.
Air Assist to Injectors. |
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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Posted:5/6/2005 21:37 |
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Bill,
There is an aftermarket security device on the vehicle. What exactly are you saying...that the security device is preventing the Excursion from starting?
I will mention the security device and the Idol Air Control to my mechanic. I will print the thread out and give it to him.
Thanks guys!
Roger |
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Posted:5/6/2005 22:03 |
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It is possible the anti theft unit could be preventing the startup but not necessarily the cranking.
Keep me posted,try and get it code scanned 
Bill
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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Posted:5/7/2005 06:48 |
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Bill,
My mechanic has a diagnostics machine and he said he is not seeing any problems. I don't know what he is using but he said that If I take it to Ford, they won't be able to tell me anything new. He has been on the phone with the local Ford dealership about this problem. Could Ford have a better diagonstics machine than him possibly? Unless the X is in the state of not starting, he won't see a problem I'm assuming.
Thanks again,
Roger |
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Posted:5/7/2005 14:11 |
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| Quote: | Bill,
My mechanic has a diagnostics machine and he said he is not seeing any problems. I don't know what he is using but he said that If I take it to Ford, they won't be able to tell me anything new. He has been on the phone with the local Ford dealership about this problem. Could Ford have a better diagonstics machine than him possibly? Unless the X is in the state of not starting, he won't see a problem I'm assuming. |
If he has a computer to pull error codes from your Excursion, he's right, Ford won't be able to tell anything different. If the X isn't throwing out any error codes, it's going to be a matter of trail and error at this point.
I would start at the security system, too. If the security system was tripped, it could crank, but it won't start up. You'll know if the security system is an issue because the red "ALARM" light will be flashing repeatedly in the gauge cluster on the dash.
-Eric
'67 Galaxie 500 - 390 FE, .030" over, FE to AOD adapter, disc brake conversion. The Daily Driver.
'00 Excursion - 7.3L PSD, LANDYOT Gen-II Radius Rods, Factory Tech Valve Body, 200K+ miles and going |
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Posted:5/7/2005 16:20 |
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Since no DTC's came up with the scan tool your mechanic utilized the trouble may be in the Fuel/ignition and base engine.
Outside of those above mentions further diagnostic procedures will need to be done with a Rotunda Distributorless Ignition System Tester (DIST) and the other, a scan tool with digital multimeter to more in depth.
So it'll be pretty much trial and error unless you get er into the Ford dealer for a thorough tear in. 
Bill
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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 Posted:5/9/2005 06:27 |
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Roger, the anti=theft device can be a little "cranky"--pun intended. If you yurn the ignition quickly and let go of it before it catches, you have to wait about 30-60 seconds before it will let you successfully crank it. Learned my lesson about 2 summers ago. Hope this helps!
David |
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