I just bought a used 98 SE Escort, 108K miles. The CHECK ENGINE SOON
came on after I drove it 40 miles. A guy at an auto parts store
was kind enough
to do a diagnostic OBD2 test, and it showed this code:
exhaust gas recirculation flow insufficient detected
Can anyone help me on this? I know where the EGR valve is, but could
else be causing insufficient flow? Can you clean the EGR
valve if it's clogged?
There were other codes on the data sheet provided by the mechanic who
the car for the dealer:
P0500 means "VSS Malfunction"
P0171 means "Fuel System Too Lean"
P1000 means ??????????
Any help would be greatly appreciated.
I just read this thread http://www.usenetcars.com/t-243457.html from
with the 97 F150. Good info.
But...is there specific detail that can be given for my car, as it's
F150? Does Jason's case apply to me also?
The problem is *usually* the DPFE sensor but not always. You can roll the
dice and replace the sensor or you can get a manual (gasp!! spend money??)
and do some diagnostics to be sure of what you're doing. P1000 isn't really
a "trouble" code.... it indicates that not all of the emissions monitors are
WTF does this have to do with a pick up? Who the hell is Jason and why would
I spend time tracking down something???? People offer their time and
expertise for free.... Do NOT ask them to chase shit....
Warman is correct. P0401 - very common that the DPFE sensor failed,
and I've seen it quoted by others about a 99% chance.
For $30 I think it is worth it for the lay mechanic to take a gamble on
it. It is called "throwing parts" at the problem, which is indeed what
you would be doing. But in this case, I think the odds are in your
favor. I think a lot of indy shops would do the same.
Or you could take it to Ford and pay them $100 for a diagnostic fee,
$30 for the part, and another $80 for one hour of labor. Of course a
real Ford factory pro would have the pinpoint tests charts and
necessary tools to determine EXACTLY what failed, most likely without a
doubt. But you get what you pay for.
Since I'm a decent mechanic, and had already bought a manual, I decided
and get a DPFE. When I walked out of the auto parts store to
drive away, the
service engine soon light was OUT! Geez...well, at
least now I'm prepared with
a new part, if that's the finicky one.
What can an intermittent signal mean with regard to EGR problems?
There is nothing 'mechanical' about replacing a DPFE sensor, except for the
typical need for triple-jointed, very skinny fingers, to be able to to bolt
it to whatever tight corner where it happens to be located without dropping
each screw ten times in a row. Practicing a few cuss words before the
undertaking helps as well.
Intermittents are a way of life when the deadly combination of hot gas
(complete with water vapor and sulphur) and electronics is involved. If you
happen to have a vacuum pump and a voltmeter, you can test your existing
DPFE very easily. It has a 'low' and a 'high' port. Turn ignition on,
disconnect the high side, pull some vacuum on the low side and watch the
output voltage go from about 1V to something like 5V. Your manual will have
the details (Warman has some tricks to do this using engine vacuum, even
without the vacuum pump, I am sure...)
Whatever you do, I would recommend checking the plumbing while you are at
it. Make sure that the hoses are intact, not plugged with soot and not
crossed over (One nipple on the DPFE should be a slightly larger diameter
than the other. Don't remember which is which, but it's easy to figure out
remembering that the high side is the one closer to the exhaust)
----- Original Message -----
I have a 95 Tbird which intermittently gave a "lean" condition code for
months before I found a vacuum leak. It apparently started as
a pinhole leak.
Once it finally became a big enough hole so I could
hear the leak I was able to
find it. As someone suggested check all
vacuum hoses and replace any that have
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