1994 will start then idle down and die after 5-10 seconds | Ford Explorer - Ford Ranger Forums - Serious Explorations

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1994 will start then idle down and die after 5-10 seconds

Hrb00drow

New Member
Joined
April 30, 2015
Messages
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City, State
Kent, Wa
Year, Model & Trim Level
1994 Ford Explorer XLT
Just bought a 1994 Explorer XLT. When I start it, it will run for a good 5 seconds @1200 rpm, idle down to 800 rpm then sputter out and die. If I hit the gas while it is dying it will stay running.

What could the issue be? I'm pretty new to this stuff.
 
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natenkiki2004

Blue Bomb!
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Location
North Idaho
Year, Model & Trim Level
1991 & 1994 Explorers
Sounds like the idle air control motor is doing it's job but somethings not right at normal idle. Typical thing would be vacuum leak, maybe clean the MAF sensor.

Is it giving you a check engine light?
 
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vq5speed

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June 17, 2008
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City, State
1991 XLT Manual Locks
Year, Model & Trim Level
Stockton,Ca
Sounds like a vacuum leak.
 
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Gadget X

Elite Explorer
Joined
March 13, 2007
Messages
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City, State
Gibsonville, NC
Year, Model & Trim Level
'94 XLT 5-speed
Maybe fuel delivery, whether due to a clogged filter, weak pump, or something related. Iirc, a vacuum leak will cause a high idle speed? Good luck with it!
 
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Hrb00drow

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April 30, 2015
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City, State
Kent, Wa
Year, Model & Trim Level
1994 Ford Explorer XLT
It is not giving me a check engine light and as of the other day it wasn't pulling any codes. I will check out the suggestions when I get home today. Thank you.
 
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OneofMany

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Joined
December 21, 2012
Messages
225
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3
City, State
Georgia Mountains- Talullah Falls
Year, Model & Trim Level
94 expl 4x4
I tend to be suspect of the IAC too, but usually it cause the engine to die right after starting. Also check your egr. If it is stuck open it will inject too much air into your air/fuel mixture.
 
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SammyM00782

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July 18, 2014
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City, State
Ewing, NJ
Year, Model & Trim Level
1994 Ford Explorer
I have the same truck with the same problem but I can isolate mine to happening only after the truck has been running already and it's not consistent. If you give it gas it'll stay running but sound and feel like a miss. There's something wonky with the EGR I think, I can't remember the code right now but what happens is as I creep out of my neighborhood at minimal throttle you can feel it stutter slightly for about 5 seconds, engine light (which burned out actually) and then it's fine.
 
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fritz24

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March 22, 2015
Messages
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Year, Model & Trim Level
2006 ford explorer EB
As they mentioned iac-hell yeah. but a Vacuum leak??? Hell noooo.
Faulty Engine coolant temp sensor-check for corrosion and cracked insulation. This will cause the engine to stall start up if stuck on hot.
fuel delivery- check if fuel system holds pressure with KOER to KOEO for about 60 sec. report back
 
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the_don

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Joined
July 29, 2014
Messages
220
Reaction score
1
City, State
park city, ut
Year, Model & Trim Level
'93 exploder limited 5spd
fuel pressure should be 30-45psi with vacuum hose attached to the fuel pressure regulator
40-50psi with vacuum hose disconnected, and must hold at least 30psi for 5 minuites after engine is shut off. but i would look at the IAC first.
 
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Albino 94LTD

Recovering from Moab 2016
Elite Explorer
Joined
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City, State
Newcastle Wa
Year, Model & Trim Level
White 94 Limited
Callsign
KG7PKQ
Check the fuel pump relay in the power distribution box under the hood.

For a test, swap it with the WOT relay.

If that fixes the issue, replace the original suspect relay with a genuine Ford part NOT and aftermarket one. The original Ford relay has lasted 21yrs.
 
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MUDDYTOES

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Joined
December 2, 2014
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City, State
California
Year, Model & Trim Level
1993 Ford Explorer XLT
Mine did the same a couple days after getting back from a long trip. If it dies at low idle but runs with higher rpm it's a vacuum leak. My 93 caught a leak at the brake booster an made it so I had to really stomp on it to get the darn brake pedal to move.
 
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crpowell67

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April 1, 2014
Messages
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City, State
Christopher, IL
Year, Model & Trim Level
1993 ford explorer
I would look more towards a vacuum leak specially in the plastic/nylon lines not saying it is not something else but start with the easiest first real easy to check lines.
 
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