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Starting Problem

walterd140

Well-Known Member
Joined
August 9, 2003
Messages
355
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City, State
Ludlow, Massachusetts
Year, Model & Trim Level
'94 Sport
Hi All. Developed an issue starting. 94 stock Explorer with 160,000 miles. The engine would crank & crank & crank. Finally starting after a lot of cranks or me physically stepping on the gas.

I changed out the air & fuel filter, plugs & wires. Still does it.

Here's a new kick.. I crank a few seconds, stop, then turn the key & it fires right up.

I do have a slight coolant leak & a fuel leak as well (hope to fix fuel leak real soon).

Any help?

Thanks in advance
Walter
 



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Verno

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Joined
October 8, 2008
Messages
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City, State
Waynesboro, TN
Year, Model & Trim Level
94 XLT
Sounds like your issue is either fuel pump or fuel pressure regulator. Do a fuel pressure test first.
 






walterd140

Well-Known Member
Joined
August 9, 2003
Messages
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City, State
Ludlow, Massachusetts
Year, Model & Trim Level
'94 Sport
Thanks Verno, but the fuel pump is either working or not, right?
 






Verno

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City, State
Waynesboro, TN
Year, Model & Trim Level
94 XLT
Thanks Verno, but the fuel pump is either working or not, right?

Not necessarily. When they begin to fail/get weak they will basically work intermittantly.
 






MrShorty

Explorer Addict
Joined
December 27, 2001
Messages
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City, State
Spanish Fork, UT
Year, Model & Trim Level
92 XLT and '87 Bronco II
Or the pump itself works fine, but the check valve in the pump (that's supposed to keep the rail pressurized when the key is off) goes bad. The fuel rail depressurizes, which means it takes longer for the otherwise good pump to pressurize the system.
 






walterd140

Well-Known Member
Joined
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Messages
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City, State
Ludlow, Massachusetts
Year, Model & Trim Level
'94 Sport
Just out of curiosity, what perssure should I get on the rail? Also, do I check it with the engine running, not running, or key turned to start (to get the fuel pump humming)?
 






MrShorty

Explorer Addict
Joined
December 27, 2001
Messages
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City, State
Spanish Fork, UT
Year, Model & Trim Level
92 XLT and '87 Bronco II
yes (by that I mean you should measure pressure under all those conditions). You might go to the Under the Hood forum and review the fuel pressure test mini-diary thread. spec fuel pressure is 40 psi KOEO.
 






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