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Questions about Fuel Systems

65 messages,  Last post on Dec 16, 2007 at 2:47 AM

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#26 of 65 2003 ford expediton xlt 4.6 by ttvjo Aug 29, 2005 (12:34 am)
yes, i have a 2003 ford expedition with 55,000 miles on it i raned it low of gas a few times now it is hesitating when i'm trying to accelerate, it goes real slow and then gradually pick up then start fading out again and sometimes jerk a little bit what is wrong anyone know should i change the fuel filter or is it my fuel pump.. also where can i get cheap parts from the dealership is so high....i have tried gas treatment but it didn't work.....it got worser at a half of tank of gas please help me out i just a little old lady...thanks Replies to this message: swschrad (Aug 29, 2005 6:31 pm) pinevideo (Dec 17, 2005 3:45 pm) swschrad (Dec 23, 2005 2:12 pm)
#27 of 65 Re: 2003 ford expediton xlt 4.6 [ttvjo] by swschrad Aug 29, 2005 (6:31 pm)
Replying to: ttvjo (Aug 29, 2005 12:34 am) try replacing the fuel filter first. it's a little interesting to work on... bolted underneath, has those silly spring clips on it, you have to bleed the pressure off first at the fuel rail... but you're due on that. aftermarket filters from a quality source like wix should be less than the dealer cost. any decent auto parts store will have a filter for that vehicle in stock. Replies to this message: pinevideo (Dec 17, 2005 3:45 pm) swschrad (Dec 23, 2005 2:12 pm)
#28 of 65 Injectors by noobie1 Dec 02, 2005 (3:16 pm)
2002 Silverado, 8.1L, 73K mi. - This truck has seen a gradual reduction in fuel mileage over the last six months. Besides plugs, what constitutes a tune-up? Should the injectors be removed and cleaned? as well as O2 sensors? Thanks.   -David Replies to this message: alcan (Dec 02, 2005 3:59 pm) noobie1 (Dec 02, 2005 6:53 pm) alcan (Dec 03, 2005 2:22 am) swschrad (Dec 23, 2005 2:07 pm)
#29 of 65 Re: Injectors [noobie1] by alcan Dec 02, 2005 (3:59 pm)
Replying to: noobie1 (Dec 02, 2005 3:16 pm) "Besides plugs, what constitutes a tune-up?"   Plug wires, air filter, PCV valve, fuel filter.   "Should the injectors be removed and cleaned?"   No.   "as well as O2 sensors?"   No. Oxygen sensors will gradually deteriorate, and when they do they'll tend to slow down their response to changes in exhaust gas oxygen content. The proper way to check an O2 sensor is to monitor it's activity on a scan tool, watching for swings between low and high voltage output. Replies to this message: noobie1 (Dec 02, 2005 6:53 pm) alcan (Dec 03, 2005 2:22 am) swschrad (Dec 23, 2005 2:07 pm)
#30 of 65 Re: Injectors [alcan] by noobie1 Dec 02, 2005 (6:53 pm)
Replying to: alcan (Dec 02, 2005 3:59 pm) "watching for swings between low and high voltage output"   Is that a good thing or bad thing? And, what kind of scan tool? Thanks alcan.   -David Replies to this message: alcan (Dec 03, 2005 2:22 am) swschrad (Dec 23, 2005 2:07 pm)
#32 of 65 2000 Ford Windstar lurching by christylove Dec 02, 2005 (8:35 pm)
I have a 2000 Ford Windstar that "lurches" for lack of a better description, while driving it. It is barely noticable but the engine light has come on. Does that sound like a fuel system problem?
#33 of 65 Re: Injectors [noobie1] by alcan Dec 03, 2005 (2:22 am)
Replying to: noobie1 (Dec 02, 2005 6:53 pm) Oxygen sensors generate a voltage signal relative to the amount of oxygen in the exhaust stream. The engine control computer uses this signal to fine tune the air/fuel mixture. The voltage should be constantly changing from about 200mV to about 800mV as the computer increases/decreases fuel delivery.   Scan tools display data stream, the actual signals being received by the engine computer from all input sensors, and can range from Actron's $300 CP9135 to Snap-on's $5000+ MT2500.
#34 of 65 Re: 2003 ford expediton xlt 4.6 [swschrad] by pinevideo Dec 17, 2005 (3:45 pm)
Replying to: swschrad (Aug 29, 2005 6:31 pm) I'm getting the same problem on a '98 Expedition. I used to have a '97 Tahoe & its fuel flter was near the right side just under the passenger door. Is the Expedition filter similarly located? Replies to this message: swschrad (Dec 23, 2005 2:12 pm)
#35 of 65 Re: Injectors [noobie1] by swschrad Dec 23, 2005 (2:07 pm)
Replying to: noobie1 (Dec 02, 2005 6:53 pm) just about any OBD-II adapter that allows for a PC or Palm display will allow you to watch the crossings of the oxygen sensors. I built a BR-1 adapter and use a junkpile laptop for the purpose. some scantools with complex LCD screens might allow watching the crossings directly on the tool, Alcan would know more about that grade of tool. you can check directly in the reviews at www.batauto.com to see if they have reviewed any that will do it.   you can also use thin wires slid into the connector to bring the signals out to a general-duty oscilloscope.

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