02 dak with 4.7 engine.i posted this problem about a year ago,since then i replaced the fuel pump,spark plugs,had my local shop do a complete flush of the fuel system.i went to the nhtsa web site for any tcb's regarding this problem...there are none.as usual there are no codes flashed even at the point of when the problem accurs.problem is when starting....as long as the truck is ice cold,truck starts fine.let run for a few miles then let it sit for about 30 minutes or so,trucks cranks and cranks but no start.then after cranking for 30 secs,truck will sputter to life.oh yea, i've benn to 3 different dealerships around the area,if they had the fix for this, i would not be posting this problem...anyone with a solution please chime in....thanks to all.

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john carfello

Have you looked into the ignition system? I know on older vehicles the balast resistor and coil sometimes give you heat-related problems, but the 4.7 is a coilon-plug isn't it? If not, check those. oh, wait, it cools for 30 minutes and then won't start? Is the fuel evaporating/draining out of the fuel rail? Check fuel pressure at the rail after letting it sit for a while.
You said you flushed the system and replaced the pump, did you replace the fuel filter too?

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99 WJ Laredo v8 4x4

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thanks horatio!!yes idid replace the fuel filter as this is an in tank system with filter as part of the pump.we checked the pressure at the rail...there is a drop continuely,but bot below 7lbs.this is considered normal according to dodge,after the vehicle sits.but again without any codes being thrown,it's hard to figure out..iwas just thinking of an oil pressure switch that may not be working properly,but were would that be located?..thanks for responding.

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john carfello

I dont know if the Oil Press switch would hinder it from starting. I had a bad one, but it didn't prevent or make hard starts with it bad, it mainly made the guage read incorrectly and sometimes stall at stops. It is located next to the distributor back by the firewall. Not easy to get to and needs special extended socket to change. Cost me @ $30.00 for the switch and I think it was $12.00 for the socket.

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if you havent fixed this problem, it may be something called a intake air temp sensor. not sure if your truck even has one cause its an 02 but might be something to check into. sensor is a thermistor, varies value of resistance in accordance with temp changes. sensor may be sending pcm a resistance value that may cause it not to start after temp raises. im not at all sure if this will be related to your problem, but something to ask local dealership, or mechanic about.

Reguardless of what the fuel pressure is after it sets for a while, as soon as you turn the key to the run position the fuel pump should prime the fuel line. I had that some problem where it wouldn't even be related to heat, just every once and a while it would crank hard and eventually sputter to life. The dealership changed the fuel pump saying the check valve in the pump was bad so every once and a while it would allow the fuel pressure to bleed back into the tank after the pump had primed the fuel rail for starting. I would check fuel pressure as it sits, as you turn the key on for the pump priming, and then for starting. Then you could see if the fuel pressure was bleeding out. nghtwlf has a good point about a sensor sending the wrong value, not off the chart wrong to kick up a code, but just wrong for the conditions to cause a real rich or lean condition.

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01 Dakota QC 4x4 4.7 V-8 Automatic
88 Mustang GT 5.0 V-8 5-Speed