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2003 Ford Explorer NO Power

Tiny
WPODLI
  • MEMBER
  • 2003 FORD EXPLORER
  • 6 CYL
  • 4WD
  • AUTOMATIC
Replaced a timing chain on 2003 ford explorer, ran for a little while and then lost power. Checked compression, put on diagnostic computer and it came up o2 sensor and cat problems.
Tuesday, March 15th, 2011 AT 4:24 PM

14 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
What were the compression readings?
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Tuesday, March 15th, 2011 AT 5:53 PM
Tiny
MERLIN2021
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Can you post all codes for me? P0420 in there?
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Tuesday, March 15th, 2011 AT 6:00 PM
Tiny
WPODLI
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Okay I will get those for you here very shortly.
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Tuesday, March 15th, 2011 AT 7:48 PM
Tiny
WPODLI
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EGR, HTR, O2 sensor and the Cat is what came up on the computer and our mechanic will go out and check the compression.
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Tuesday, March 15th, 2011 AT 7:49 PM
Tiny
MERLIN2021
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OK these are description the codes are Pxxxx Or Uxxxx or Bxxxx can you get these?
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Tuesday, March 15th, 2011 AT 8:26 PM
Tiny
WPODLI
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The Compression readings are cylinder 1 was between 60-90.
Cylinder 2 was was 90
cylinder 4 was 150.
Cylinder three he couldn't get a reading because it was leaking off. He couldn't get a tight connection.
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Tuesday, March 15th, 2011 AT 8:39 PM
Tiny
WPODLI
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The diagnostic computer just comes up with symbols not codes. The solis computer isn't working. The computer he used was the Blue Point Can OBD2&1
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Tuesday, March 15th, 2011 AT 8:42 PM
Tiny
MERLIN2021
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If these are accurate 60-90 is too low and means internal engine problems, have a wet test done to determine if it's rings or valves, use a few drops of oil in the low cylenders, retest, if reading improves, rings are worn, if no improvment, valves are worn.
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Tuesday, March 15th, 2011 AT 8:44 PM
Tiny
MERLIN2021
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Propper method so GAS does not give false readings!
ENGINE COMPRESSION

Gasoline Engines

Check engine compression with engine at normal operating temperature, all spark plugs removed (on
dual plugs, remove exhaust side only), and throttle wide open. Ensure crankcase is full and oil is of
correct viscosity. With compression gauge installed, use remote starter switch to crank engine.
Crank engine at least 5 revolutions, and record highest reading. Repeat procedure for all cylinders,
using approximately same number of revolutions. Lowest compression reading should not be less
than 75 percent of highest compression reading. No cylinder compression reading should be less than
100 psi (7 kg/cm2 ).
NOTE:
DO NOT use ignition switch to crank engine. Fuel injection and coils
will activate and may cause damage.
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Tuesday, March 15th, 2011 AT 8:50 PM
Tiny
MERLIN2021
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If you have been cranking the engine for some time, you may have washed the cylenders in gas, this will KILL compression! Do an oil and filter change so you do not damage the engine! As in the post above YOU MUST either use a remote starter or remove the fuel pump relay and ignition fuses or gas will be injected into the engine.
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Tuesday, March 15th, 2011 AT 8:54 PM
Tiny
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I wanted to touch base with you again. We did compressions tests. There is good compression on the driver side, no compression on the passenger. The valves and the cam is good. There is just no power and are really stumped with this. Especially with the lack of compression on the one side.
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Monday, March 21st, 2011 AT 8:01 PM
Tiny
MERLIN2021
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If the test was done correctly, it sounds like a warped head or timing chain probem. I will post the specs later today.
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Tuesday, March 22nd, 2011 AT 10:16 AM
Tiny
WPODLI
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We are thinking timing chain. We let our mechanic go because of lack of showing up and mistakes. He put one part of the timing chain on but not the other side and that's what we are thinking he didn't do it right. We have the ford explorer cam tool. But having the specs would be great
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Tuesday, March 22nd, 2011 AT 11:54 AM
Tiny
MERLIN2021
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The other thing is does this mechanic know and work on these? Valve guides are usually broken and in the oil pan, so check the guides on the dead side. If broken, engine R&R needs to be done, also there are a few special tools needed to do these, like cam holding tools ans the timing belt tensioners are on the outside and screwed into the head. Not the greatest design ever.
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Tuesday, March 22nd, 2011 AT 8:06 PM

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