1999 explorer
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Joined: Jul 2016
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1999 explorer
I NEED HELP....my truck runs like a brand new one....but on occasion it just won't start.....sometimes it will be over night and sometimes its days before it will start....we have changed the fuel pump 3 times thinking we were gettin a bad pump ....filter has been changed 4 times....we service it on a regular basic and fix anything that happens to it cause I really love it....but I am at witts end on this....we have changed the crank shaft postion sensor .....02 sensors ....it only does this when the ENGINE IS COLD NOT THE WEATHER....someone please help me cause I am ready to sell my baby 
Logistics Pro
Joined: Jun 2009
Posts: 4,819
Likes: 83
From: Cedar Rapids, IA
Have you made any attempt to determine what it doesn't have when it won't start? If not, that's a necessary next step. Get access to a spark tester and a fuel pressure tester. When it won't start, install the fuel pressure tester at the fuel rail to see what amount of fuel pressure you have. If there's decent pressure, does it bleed off quickly?
Also check for spark to the spark plugs (or at least the ones you can easily reach).
If you have correct fuel pressure and good spark but the engine still won't start, pull a spark plug or two and check the condition. Are they wet with fuel? Are they black from carbon? Are they in good shape with a correct gap?
Do you have access to a scan tool with datastream mode that would make checking the Engine Coolant Temperature easy?
-Rod
Also check for spark to the spark plugs (or at least the ones you can easily reach).
If you have correct fuel pressure and good spark but the engine still won't start, pull a spark plug or two and check the condition. Are they wet with fuel? Are they black from carbon? Are they in good shape with a correct gap?
Do you have access to a scan tool with datastream mode that would make checking the Engine Coolant Temperature easy?
-Rod
Mountain Pass
Joined: Mar 2012
Posts: 210
Likes: 19
From: Southeast MI.
how old are the plugs and wires? I had a 74 montego that would sometimes not start and on a whim i changed the wires. ran like a champ after that. small cracks will let the wires short out to each other. something to look at.
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