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Fuel pressure

Tiny
JON SPRADLIN
  • MEMBER
  • 1994 FORD EXPLORER
  • 4.0L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 330,000 MILES
At first when I would drive it I could barely get it up to fifty five mph and when I would go up an incline it would loose all power and barely go up it. I changed fuel pump and fuel pump housing because the fuel gauge was not reading accurately. It seem to help it now I can get it up to sixty five to seventy mph with no problems, but it still looses power on inclines and fuel gauge is still not accurate. I did a pressure test and with key on engine off it is at 8 psi from what I read its suppose to be 35-40 psi and with engine idling its at 41 psi which is within normal. I do not want to spend $80.00 on a new regulator if it is not the problem.
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Sunday, January 21st, 2018 AT 3:20 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Good morning.

It is a good possibility that your catalytic converters are clogged. I would have the back pressure checked. It is a test where you remove an O2 sensor and insert a gauge and run the engine. If there is back pressure above one to two lbs, they are clogged.

Roy
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Sunday, January 21st, 2018 AT 4:32 AM
Tiny
JON SPRADLIN
  • MEMBER
  • 5 POSTS
It does not have a catalytic converter.
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Sunday, January 21st, 2018 AT 9:51 AM
Tiny
ASEMASTER6371
  • MECHANIC
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Okay, then I would start with a compression test. It will give us an idea to see if the timing chain has slacked off.

Roy
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Sunday, January 21st, 2018 AT 9:54 AM
Tiny
JON SPRADLIN
  • MEMBER
  • 5 POSTS
Okay, I will try that.
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Sunday, January 21st, 2018 AT 9:55 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Let us know the results.

Roy
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Sunday, January 21st, 2018 AT 9:57 AM
Tiny
JON SPRADLIN
  • MEMBER
  • 5 POSTS
I also forgot to add that when I first start it up after it has sat for a little bit I have to let it run for about ten to fifteen minutes to warm up or it will not move. It will spit and sputter.
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Sunday, January 21st, 2018 AT 10:10 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, let's start with the basics.

Roy
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Sunday, January 21st, 2018 AT 10:11 AM
Tiny
JON SPRADLIN
  • MEMBER
  • 5 POSTS
Did pressure test the gauge read 165 on all six cylinders.
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Sunday, January 21st, 2018 AT 11:24 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, that is good.

You have fuel pressure and compression.
Check the spark from the coil to see if it is a good snap.

Also, injectors are next stop to see if they are working.

Roy
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Sunday, January 21st, 2018 AT 11:31 AM

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