2002 ford explorer sport cranks but will not start

Asked by Jan 14, 2017 at 06:22 AM about the 2002 Ford Explorer Sport 4WD

Question type: Maintenance & Repair

Drove my 2002 ford explorer sport ( NOT sport trac) on several errands. After coming out of one of the stores the truck would crank but not start. Towed it to a friend's house ( heated garage) . Replaced the fuel filter, crank sensor, checked the emergency gas shut off, Car has fuel at least up to the filter.After changing the filter when it still wouldn't start I popped the connection again and it was charged. So I assume it has fuel ( plan to see if I can find the schrader valve today and do a pressure check) .and the fuel pump is working. Checked for spark. I have spark. Shot starting fluid in the intake and still would not even give me a Bump, just cranked. Checked for fuel injector pulse with a NOID light. NO codes come up. don't know where to even check next since I seem to have spark and fuel and the fact that I don't even get a bump with the starting fluid. Guys at autozone suspect a sensor, but which one and how to tell with no codes?

8 Answers

87,145

What color is the spark? White or orange?

87,145

It should be white, may have weak coil, or ignition control module.

I'll check today. My friend was watching the spark while I turned the key

I should also add that there is no RPM movement on the gauge when cranking . I will take a better look at the anti-theft light today also . I didn't notice anything obviously different and I have used 2 different keys but some suggested the anti-theft system .Thanks for the help so far

87,145

Yes, try to turn off the anti-theft system, that would make it not start.

Further update. Checked fuel pressure it was at 55 lbs. replaced the cam shaft position sensor, spark plugs and ignition coil. Still turns over has fuel and spark but no start.Verified spark by pulling spark wire, putting a new plug in it and then holding near ground while cranking engine. Spark was strong and white. Still no reaction when squirting starting fluid in the intake. Visually saw the cam shaft turn but no reading on the tach. The anti-theft light did not blink (comes on when key is turned but goes right out) , so I assume the anti-theft is not an issue. Otherwise, how do you "turn it off"? The only things I can think of is that maybe the replacement Cam sensor or crank sensors are bad (unlikely but it happens) , or maybe the main computer is bad ? Or, a bad ground somewhere (but how do you find them all) ? Anyone have any other ideas worth testing? Will try compression test tomorrow if I can get a tester. My buddies and I are at a lost. Thanks for all the help so far

87,145

If it where a cam sensor or a crank sensor, it would show up in the codes. Checking the compression may tell the story, so let us know. It is possible the timing chain guides and tensioners are worn creating slop in the chain possible jumping a tooth or so. Squirting starting fluid in it should have started. Check to see how much slop is in the timing chain since you can see the camshaft, by manually turning the engine clockwise until the cam moves, then see how far back the crank move counter-clockwise before the cam starts to turn. You can measure this from the timing mark on the end of the crankshaft pulley.

Didi the compression check today and the driver's side had 0 pressure so it looks like I will be looking for a new truck. Thanks for all the help and advice.

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