Question about 1999 Ford Expedition

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99 expedition wont start

Seems to be fuel in the rails,not sure if I am getting spark,how do I check

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There are a couple of ways.I would remove a plug wire from one of the spark plugs,useing a spark tester that you can pick up at your local parts store insert it into the spark plug wire and have someone crank the motor and you watch the tester.

Posted on Mar 09, 2009

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Posted on Jan 02, 2017

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1 Answer

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An engine needs three things to run air, fuel, spark. So check to make sure air supply is adequate. Check fuel supply. Check to see that all air has been bled from the injector rails. Check wiring again . Make sure ground strap is reattached from firewall to engine. Pull off a plug wire and check for spark. If distributor was removed make sure it was reinstalled correctly and it is not 180 degrees off. Recheck all plug together connectors. Hope this helps.

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need to check fuel pressure shrader valve on fuel rail check for fuel ,remove a plug wire check for spark,plug wires have very strong current be very careful not to get shocked,if either one is not there then let me know we can go from there

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could be fuel pressure regulator or throttle position sensor,check them first,make sure your getting fuel to motor

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check your crankshaft position sensor

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1 Answer

99' expedition wont start in cold weather why?


This is information straight from the repair manual.
1. Defective spark plugs. the gap is to wide to get a nice spark to fire the engine.
2. Defective coolant temperature sensor.
3.Fuel not reaching the injectors, check filter, pump and fuel lines.

I would check one of the first 2. The temp sensor is where i would start.

Feb 01, 2010 | 1999 Ford Expedition

1 Answer

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its not easy the way you put it, but maybe first thing to check should be fuel pressure at the fuel rail should be above 50 psi to start if its below its going to be hard to start, most times is a defective fuel pump, next check for spark at the coils if its a 4.6 or 5.4 v8 take off one coil tell a friend to help you crank the engine from inside while you check for spark if there is no spark find or rent an obd2 code reader and check for dtc it will save you a lot of time than checking one by one

Dec 08, 2009 | 1999 Ford Expedition

1 Answer

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I have a 1995 impala ss with lt1 motor it wont start i changed the cap&rotor,starter,ingnition modulator,fuel filter and it still wont start


First thing I'd check is the optispark sub harness. Check both connections, the one by the optispark and the one on the passenger side of the intake manifold. Disconnect both sides and check for corrosion. This is a known weak spot on these motors.

If that checks out your going to want to start with the basics. Do you have spark and fuel? Pull the spark plug wire for a cylinder and using a spark tester test for spark while cranking. You want to have a nice blue spark. If you have good spark check for fuel pressure by hooking up a fuel pressure gauge to the shrader valve on the fuel rail. It should be in the high 40s - low 50s. If you have fuel also, check to make sure the injectors are getting a pulse using a noid light.

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check out the injectors and the coil pack to make sure you are getting spark

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99 Expedition - Stutters and loses power when accelerating


My was doing the same thing, it was an EGR valve and a misfire on the #2 cylinder which required a new spark plug and a coil pack
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