No start when warm????
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Junior User
Joined: Sep 2006
Posts: 63
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From: Torrance CA
No start when warm????
Driving me crazy.. 2002 Ranger XLT auto 3.0 will not start after it has run awhile, Was very intermittant at first sometimes six months would pass, sits for and hour or so and would start right up and run great. Lately it is becoming more frequent. Good fuel press, good spark, I have changed the coil pack, fuel relay, filter , am at a loss. HELP,
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
Have the computer scanned for trouble codes & post All code Numbers. If no codes found, since it takes air, compression, fuel & spark to make em run, whats going missing when it won't hot start??? When you tested fuel pressure & spark, was it in one of it's no start fits????
Thread Starter
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Junior User
Joined: Sep 2006
Posts: 63
Likes: 0
From: Torrance CA
Have the computer scanned for trouble codes & post All code Numbers. If no codes found, since it takes air, compression, fuel & spark to make em run, whats going missing when it won't hot start??? When you tested fuel pressure & spark, was it in one of it's no start fits????
Moderator
Joined: Jan 2004
Posts: 13,851
Likes: 111
From: SW Va
OK, good feedback. When its in one of its warm no start fits, get a fuel pressure gauge connected to the fuel rail Schrader valve test port & post the fuel pressure numbers.
If you don't have, or cant borrow one, Harbor Freight has one for $20 that's good enough, if you'll wrap all the threaded fittings with some PTFE ribbon dope so they won't weep.
If you don't have, or cant borrow one, Harbor Freight has one for $20 that's good enough, if you'll wrap all the threaded fittings with some PTFE ribbon dope so they won't weep.
Mountain Pass
Joined: Mar 2012
Posts: 210
Likes: 19
From: Southeast MI.
i know how much a pain in the butt an intermittent problem can be. you think you know what it is, change the part, only to have the same problem. You can throw a lot of money at a vehicle before you stumble onto the problem. problems i have heard about when the vehicle is warm is the ignition control module, pcm. a good website for how to test things is
Part 1 -Ford 3.0L, 3.8L Index of Articles
Part 1 -Ford 3.0L, 3.8L Index of Articles
Posting Guru
Joined: Apr 2000
Posts: 1,746
Likes: 4
From: PNW
If you turn the key to ON (not START), can you hear the fuel pump run for a few seconds when you're experiencing a no-start? If you don't hear the pump running in ON or if you check fuel pressure while cranking and it's low, give the bottom of the fuel tank a tap with a rubber mallet or, with a block of wood against the bottom of the tank, use a regular hammer to hit the wood. The idea is to jar the fuel pump a bit and see if it will start running. Just like starters, fuel pump motors can get a bad spot on them.
In addition to what jswford listed, I've heard that crank sensors like to fail intermittently. One more thing to add to the list.
Finally, I posted a youtube video of some guy who had a wiring issue at the underhood fuse/relay panel. A jiggle test uncovered the problem and he shows how to jumper the relay to isolate the problem. I'll see if I can find that link.
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