Engine will not start up?

Tiny
MCCCK5
  • MEMBER
  • 1994 FORD EXPLORER
  • 176,000 MILES
I am having a problem starting my vehicle after it has set for a time. The things I have done fuel pressure with Key on Engine off 35psi key on engine running 30psi. I have check for fuel available after it sits and fuel is present at the rail on the injectors. Switched reelays around to see if any difference and there is not. I have checked and ignition fire is present.
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Wednesday, December 30th, 2020 AT 6:56 PM (Merged)
Tiny
JOE F
  • EXPERT
If you have spark and fuel, it should run. There are two things I need you to check. First, switch the EEC relay (under hood) with a different relay with the same part number to see if that helps. Next, when it doesn't start, check to make sure the injectors are getting power to transfer the fuel from the fuel rail to the engine. See if it will start with starting fluid when it happens.

Let me know what you find.
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Wednesday, December 30th, 2020 AT 6:56 PM (Merged)
Tiny
FIXITMR
  • MEMBER
Squirt some gas in intake and see if it fires up for a second or 2.
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Wednesday, December 30th, 2020 AT 6:56 PM (Merged)
Tiny
MCCCK5
  • MEMBER
I have replaced both the EEC Relay and the fuel pump relays. I have also tried starting fluid and it does not help. Check engine light is not on as I continually crank it will backfire and eventually start and run very rough until the temp comes up then it runs fine and will start fine until it is allowed to sit and cool off.
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Wednesday, December 30th, 2020 AT 6:56 PM (Merged)
Tiny
MCCCK5
  • MEMBER
It does
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Wednesday, December 30th, 2020 AT 6:56 PM (Merged)
Tiny
MCCCK5
  • MEMBER
I have to say I am disappointed in the slow or no response.
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Wednesday, December 30th, 2020 AT 6:56 PM (Merged)
Tiny
CJ MEDEVAC
  • MEMBER
NOT REAL GREAT ON THESE NEWER PUPPIES

SOUNDS LIKE A SPARK ISSUE, IF THE STARTER FLUID WAS NOT AN INSTANT "BUST OFF"

HOW LONG AGO SINCE IT HAD NEW "PROPERLY GAPPED" PLUGS AND OTHER IGNITION RELATED TUNE-UP PARTS?

I TRY

YOUR TURN

THE MEDIC
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Wednesday, December 30th, 2020 AT 6:56 PM (Merged)
Tiny
FIXITMR
  • MEMBER
What about codes? Have you tried reading them? Sounds like it's too lean on startup. Check temp sensor and clean MAF if it's dirty.
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Wednesday, December 30th, 2020 AT 6:56 PM (Merged)
Tiny
EMELIUS
  • MEMBER
  • 1994 FORD EXPLORER
  • 6 CYL
  • 2WD
  • MANUAL
  • 135,000 MILES
For about 4-5 months my Ford Explorer would sporadically turn off, but would turn on again after a good 15-20 minute cool down. Just recently, the car turned off and wouldnt' start up again at all.

I had the fuel pump replaced, but that didn't help.

I tested to see if the fuel pump engaged, and it did, but when I test to see if fuel will squirt out of that test valve on the engine (not sure what its called), very little pressure comes out, and this was the case the whole time I had this car ( I bought it used ).

Recently, i've had suspicion that it would be the Crank shaft position sensor?

Any opinions?
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Wednesday, December 30th, 2020 AT 6:57 PM (Merged)
Tiny
EMELIUS
  • MEMBER
Also, i'd like to note that I bought a car repair manual and went ahead and tested the the crankshaft position (CKP) sensor connector with the voltmeter and got 0 volts with the Key on and engine off, so I assume this is the problem.

Would a bad CKP (crankshaft positon sensor) be the problem for my issues?
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Wednesday, December 30th, 2020 AT 6:57 PM (Merged)
Tiny
BUNKBED973
  • MEMBER
  • 1994 FORD EXPLORER
  • 185,000 MILES
New fuel pump, fuel lines and filter all sensors checked ok on scan. Fuel pressure at rail goes no higher then 30 psi. Also does the fuel enter or exit the fuel rail through the pressure regulator?
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Wednesday, December 30th, 2020 AT 6:57 PM (Merged)
Tiny
JOE F
  • EXPERT
The fuel pressure is good. Do me a favor. When this happens, open the hood and switch the EEC relay with another one from the relay box that has the same part number. I have had situations where the relay wouldn't work when warm.

Let me know if it works.
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Wednesday, December 30th, 2020 AT 6:57 PM (Merged)
Tiny
BUNKBED973
  • MEMBER
Hi and thank you for answering I already tried that I should have put that in my question. We even replaced the pcm. When it happens if I release the pressure from the rail the truck will start
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Wednesday, December 30th, 2020 AT 6:57 PM (Merged)
Tiny
JOE F
  • EXPERT
Is the regulator working?
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Wednesday, December 30th, 2020 AT 6:57 PM (Merged)
Tiny
BUNKBED973
  • MEMBER
Yes it is we actually replaced it with a known good one just in case it was bad. Even left the pressure guage on it held 30 psi for over 6 hours. Im thinkiing maybe the garage accidentally switched the feed and return lines to the rail when they replaced them. Do you know if the fuel flows into or out of the rail at the regulator?
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Wednesday, December 30th, 2020 AT 6:57 PM (Merged)
Tiny
MOTORHEAD2
  • MEMBER
  • 1994 FORD EXPLORER
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 98,000 MILES
I have a 1994 Ford Explorer that gives a code 341 and will only fire for a brief second on initial startup. Things I have already done: 1)New battery and clean terminals. 2)Relays checked ok. 3) changed fuel filter.
4) Fuel pressure holds at 40 psi during cranking. 5)get spark at coil on all three banks of coil while cranking. 6) tested 12v and signal at injector with logic probe-receiving both 12v and a signal during cranking. Also tach on car works during cranking.
As a final note, car will run with starting fluid which leads me to believe some type of fuel injection problem. Any ideas?

Updated 11-13-09

The fuel pressure stays at a constant 40psi. I also checked and bypassed the fuel reset button but still no luck.
NEXT?
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Wednesday, December 30th, 2020 AT 6:58 PM (Merged)
Tiny
JOE F
  • EXPERT
With the key on and not in the start position, how much fuel pressure do you have?
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Wednesday, December 30th, 2020 AT 6:58 PM (Merged)
Tiny
MOTORHEAD2
  • MEMBER
Fuel pump weak. Pressure is too low.
Thanks
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Wednesday, December 30th, 2020 AT 6:58 PM (Merged)
Tiny
JOE F
  • EXPERT
WHat pressure is it? I looked everything up. Running, the pressure should be between 35 and 45PSI. Your original post said 40PSI. Has that changed?

Let me know.
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Wednesday, December 30th, 2020 AT 6:58 PM (Merged)
Tiny
MOTORHEAD2
  • MEMBER
My pressure gauge stayed at a constant 40psi. After tapping into the fuel rack with a known good fuel pump, the car is running. The tap block on my pressure guage has a check valve in it that I missed.
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Wednesday, December 30th, 2020 AT 6:58 PM (Merged)

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