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stalled at 10,000 ft


boisebamber

New Member
Joined
March 13, 2008
Messages
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City, State
boise
Year, Model & Trim Level
99 sport
99 xlt 6 cyl 4 L ...160k

runs great in all respects except when temp excceeds about 65. then to start it i have to crank once, turn off ignition and then re-crank. fires right up.

today i was on grand mesa at 10,000 ft and engine started to sputter as i was exiting at slow speed from parking lot. finally stalled. i cranked a few times, no go,waited, cranked again and it started right up and runs fine that i can tell.

i have replaced IAC, EGR, cleaned MAF, changed all O2 sensors, full tuned-up ..all in last 6 months in attempt to fix starting problem.

mechanics tell me to check each injector for leaks and/or new fuel pump.

i suppose stalling at high altitude is related to starting problem but am not sure.

any illumination would be appreciated.
 




ranger7ltr

Elite Explorer
Joined
November 17, 2001
Messages
1,303
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18
City, State
Great State of Texas
Year, Model & Trim Level
1999 Sport
When was the fuel filter replaced last?

The returnless fuel system on the 99 and up Explorer is picky about losing presure and/or volume. Check the fuel pressure at the fuel rail... minimum should be 65 psi although the engine will run as low as 55 psi...

But I would check pressure before then after changing the filter before changing any hardware...Especially if the engine runs fine for the moment...
 




ucluglee

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October 13, 2010
Messages
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City, State
Greenville, SC
Year, Model & Trim Level
'00 XLT
As minor as this sounds, try a new gas cap.
 




boisebamber

New Member
Joined
March 13, 2008
Messages
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City, State
boise
Year, Model & Trim Level
99 sport
not disagreeing on the fuel cap, but why would outside air temp influence? i guess being at 10,000 ft and operating at slow speed could have been precipiator of stall...the famous boyles law.

at any rate will get new fuel cap and giver er a try.

one mechanic said the thing ran 'cool'. i had a logical disconnect on this because i live in texas and running 'cool' sounds like a good thing.

any thoughts on ECT functionality?
 




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