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Please help me figure out the problen

Tiny
HOLLYSA12
  • MEMBER
  • 2002 FORD F-150
  • 163,000 MILES
My 2002 f150 4.2l v6 is having problems. It will drive fine then lose power. U can floor it and it will not move it will only idle. Then it will catch power and go. It does this often now help please
Saturday, July 7th, 2012 AT 1:31 AM

9 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Check fuel pressure.

Check for back pressure from cat converters.

Roy
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Saturday, July 7th, 2012 AT 1:51 AM
Tiny
HOLLYSA12
  • MEMBER
  • 4 POSTS
Done did cats r fine and fuel pressure is good
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Saturday, July 7th, 2012 AT 1:55 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Ok, what is the pressure on the fuel and the back pressure on the cats?

Roy
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Saturday, July 7th, 2012 AT 2:01 AM
Tiny
HOLLYSA12
  • MEMBER
  • 4 POSTS
I am not sure my dad did it and he is a mechanic. But this problem has stunned us we have checked and changed everything. Lol. At a lost really I wanna say fuel pressure was 35
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Saturday, July 7th, 2012 AT 3:06 AM
Tiny
MIKEDEROUIN88
  • MEMBER
  • 137 POSTS
Did the car run hot?
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Saturday, July 7th, 2012 AT 8:46 AM
Tiny
TACHAINS
  • MEMBER
  • 1 POST
There could be a build up of debris in the fuel tank when the fuel pump is drawing fuel it will catch the debris and cause low pressure put a fuel pressure gauge on it and check pressure as you are driving it
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Saturday, July 7th, 2012 AT 9:43 AM
Tiny
HOLLYSA12
  • MEMBER
  • 4 POSTS
We done the fuel pressure at autozone and they said it was fine for that truck. Fuel tank was cleaned bout 4 days ago we put a new fuel pump in it
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Monday, July 9th, 2012 AT 12:41 AM
Tiny
HOLLYSA12
  • MEMBER
  • 4 POSTS
No truck is not running hot
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Monday, July 9th, 2012 AT 12:50 AM
Tiny
MILTONDACUSJR
  • MEMBER
  • 1 POST
Got the EXACT same problem on a truck im working on, getting codes P0174, P1131, and P0135, not running hot, fuel press around 35-40 while driving down the road, when it stalls out to nothing, its still idling but wont accelerate, the fuel pressure DOES NOT change at all as this is happening, then after a few seconds. Vrroom right back to running perfect. What the hecks going on?
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Friday, November 16th, 2012 AT 6:43 PM

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