I've read a few posts here about fuel pumps and am not sure if the
symptoms my '02 ZX5 are the same.
when cruising at constant speed (not accel / decel) at about 1800rpm
in any gear, my car 'lurches' in a very consistent manner, about 2-3
times per second, such that it can feel as though I am driving along
an evenly rippled road. It does not have any problems with hard
can anyone suggest what might cause this? I have a trip planned for
monday but am hesitant to take this car if it's going to die on me!
My 2000 Focus SE wagon with the 16V DOHC Zetec does *exactly* the
I wouldn't worry about taking the trip (what, me worry?). Mine has
been doing it for some time, and I don't like it, but it's pretty
subtle and I fear that no one else but me could discern that there is
anything wrong. Of course now that I've said that, it'll probably
go bad all of a sudden when I'm 50 miles from nowhere on a cold
But, I do know what you are talking about. I was actually hoping it
would get worse and turn out to be the fuel pump issue, so I could get
it repaired for free by Ford.
Please let the group know what happens, as I will do if I ever get
a resolution to my problem.
BTW, what sort of gas mileage are you getting? Mine's never been
nearly as good as I had expected, up to 30 on long trips, but around
town and commuting I only get about 25 mpg (US gallon). It has the
4 speed auto transmission.
Would that not set a code in the computer? I have these symptoms and
there were no codes the last time I started it up with the tripmeter
in diag mode.
Also- is the DPFE sensor covered under an emissions warranty? My 2000
Focus is out of standard 3/36 warranty, but it would be nice to get
Ford to pay for a DPFE sensor if it's considered a critical emissions
Mine did not throw a code until the dealer flashed the EPROM and re-tested. At
that point, it became clear to them. It was covered under the (2001) warranty
but I would think it should be covered by the emmisions warranty since the DPFE
sensor directly controls the EGR. This problem seems to happen at about 20K
Thanks for the confirmation. I decided to do a little experiment to see
if the 'ripple' effect was related to the EGR system. I disconnected the
vacuum hose to the EGR valve and plugged it with a golf tee. No more
ripple effect, and it seemed to have a little more pep at part throttle.
The check engine light did come on, which I expected, but the fact that
it runs so much smoother now has pretty well convinced me. I'm going
to run a tank of gas through it this way to see if my mileage gets any
better, I think it will.
We own a 2000 Focus and just got a letter from Ford addressing this problem.
They state it is something with the fuel pump...ALTHOUGH they don't have a
fix for it yet. But they stated that it would be available after the first
of the year and they would be extending the warrenty to 10year/100,000
Check with your Ford dealer about this. It covers 2000 and 2001 models.
I don't see a recall number, but there is this number:
Program 03n01 - Possible Engine Stalling In 2000 And 2001 Ford Focus
They go on to state that if you are having severe problems, bring your car
in and see if they have a "interm part"...
Hi Bob / mark, i forgot to mention in my post that my "check engine"
light is on, so it sounds like this might be the problem. Am I able
to check which 'code' has been identified?... I noticed mark started
his car with "tripmeter in diag mode"... how would I do that?
I am also naive to the meanings of DPFE and EGR... sounds like I shoud
go get the haynes manual?
Well, after I disconnected and plugged the vacuum hose to my EGR
valve (in order to see if inappropriate/untimely application of EGR
was responsible for the surging, and yes, it was), the CEL lit up.
So I tried holding down the tripmeter reset button for five seconds
while turning the key to the RUN position (release when you see the
word 'test' displayed). Then you press the reset button to cycle
through various displays, including some possible DTCs (Diagnostic
Trouble Codes). Unfortunately, even though the CEL was lit, the
tripmeter reported 'DTC NONE'. Apparently it does not give you the
OBD-II codes, just codes related to the instrument panel itself.
Here's a page that says how to do it for a Mustang, the Focus's
display sequence is similar but not exactly the same:
Haynes aren't very good for much beyond simple parts replacements.
They tend to advise taking it to the dealer for anything related to
fuel injection or engine management. The genuine Ford manual set is
pretty expensive- I bought the mechanical and electrical volumes
for $180 (IIRC) but unfortunately I didn't buy the engine
management/fuel injection volume, which is probably another $150 or so.
DPFE is Differential Pressure Feedback EGR sensor (I think)
EGR is Exhaust Gas Recirculation (this I know)
Hi Mark, thanks for the follow up. Is replacing these sensors costly
/ difficult. Is this the kind of problem best solved by a
dealer/service center or will the sensors be easy to come by and
straight forward to replace? I realize this is a judgement call so
I'm just wondering how big a job this is? I am reasonably thrifty and
have worked on my past cars to a limited extent - but never dealt with
The DPFE sensor on my 2000 Focus is right out in the open on the firewall
just to the left of the brake reservoir . You might need to remove
the air intake runner from the air filter box to the throttle body in order
to get access to where the hoses attach to the EGR tube. Piece of cake.
I would try to get Ford to pay for it, I will mention the symptoms when I
bring my car in for the battery cable/pinch bolt recall.
 (when you are standing in front of the car)
DPFE- differential pressure feedback exhuast (sensor) this monitors exhaust
back pressure in the manifold and feeds back a signal to the ECU which it
then uses to improve the accuracy in the amount of EGR (exhuast gas
recirculation) lift it applies to the EGR valve- basically it knows that
when exhuast pressure is high (with a wide throttle) more exhausrt gas is
going to pass through the EGR valve at a given opening than when exhuast
pressure is low.
Bear in mind that a lazy o2 sensor will give exactly the same symptoms as
you are experiencing too. But check the EGR system first- disable it
temporarily to check - disconnect and plug hose as per previous post.
This ripple effect sounds just like my problem see "Help needed"
23/12/2003. It has the same symptoms except for the horrible smell which has
not reoccured since the first episode, I am bringing my focus to my dealer
on monday next to try and get it sorted out
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