McWotever Registered User
#1

2000,Mk1 Focus, 1.4 petrol hatchback, circa 119k

Recently developed a problem which i initially thought was leakage from the badly rusted exhaust, replaced both the back and centre box but still have the same problem.

Sounds now like it could be a misfire?

On idle the engine seems fine, and the RPM needle is rock solid.
Revving in neutral also sounds fine.
But under any pressure, like accelerating, a slow, jerking acceleration is given. On cruise runs grand, but going uphill the same happens and will lose power, the needle also drops 50RPM or so before recovering.
Also fuel consumption has risen significantly.

I've dropped a bit of injector cleaner in a full tank today and ran it for 50 miles but still have the same problem.

Oil change, air and oil filters, HT lead change, plugs change all only circa 6k ago (3 months-ish). Any ideas wot could be the problem?

Plan to pop new plugs in tomorrow, but the old ones look fine. Trying to start at the cheapest option and working up!

Andy013 Registered User
#2

2000,Mk1 Focus, 1.4 petrol hatchback, circa 119k

Recently developed a problem which i initially thought was leakage from the badly rusted exhaust, replaced both the back and centre box but still have the same problem.

Sounds now like it could be a misfire?

On idle the engine seems fine, and the RPM needle is rock solid.
Revving in neutral also sounds fine.
But under any pressure, like accelerating, a slow, jerking acceleration is given. On cruise runs grand, but going uphill the same happens and will lose power, the needle also drops 50RPM or so before recovering.
Also fuel consumption has risen significantly.

I've dropped a bit of injector cleaner in a full tank today and ran it for 50 miles but still have the same problem.

Oil change, air and oil filters, HT lead change, plugs change all only circa 6k ago (3 months-ish). Any ideas wot could be the problem?

Plan to pop new plugs in tomorrow, but the old ones look fine. Trying to start at the cheapest option and working up![/Quotei


I'd say your problem is the coil . Very Commen to go on the focus.

McWotever Registered User
#3

That has been mentioned to me alright....sounds expensive!

#4

There are two common causes of misfires on the Focus, failing coilpacks and water getting into the spark plug recesses due to the frost plugs in the cylinder head leaking.

Pop the plug leads off the plugs and have a look down into the recess to see of there is any water or major rust, in not then a coilpack is likely.

McWotever Registered User
#5

Nissan doctor said:
There are two common causes of misfires on the Focus, failing coilpacks and water getting into the spark plug recesses due to the frost plugs in the cylinder head leaking.

Pop the plug leads off the plugs and have a look down into the recess to see of there is any water or major rust, in not then a coilpack is likely.


By coilpack do you mean ignition coil?

#6

McWotever said:
By coilpack do you mean ignition coil?



No I mean coilpack They are not quite the same thing. A Focus doesn't use an ignition coil.

Andy013 Registered User
#7

Nissan doctor said:
There are two common causes of misfires on the Focus, failing coilpacks and water getting into the spark plug recesses due to the frost plugs in the cylinder head leaking.

Pop the plug leads off the plugs and have a look down into the recess to see of there is any water or major rust, in not then a coilpack is likely.


By coilpack do you mean ignition coil?[/Quote

Yes coil pack is the ignition coil. The frost plugs leaking are on the new shape 05 focus. So you don't have to worry about that. I think the coils are about 160 - 180. Had to get one last year for my car.

McWotever Registered User
#8

Don't say that! LOL

Looked at micks garage they are saying €40ish.

Unless the figure you are quoting is supplied and fitted in a garage? Looks like a handy enough DIY job to test and replace.

#9

McWotever said:


By coilpack do you mean ignition coil?[/Quote

Yes coil pack is the ignition coil. The frost plugs leaking are on the new shape 05 focus. So you don't have to worry about that. I think the coils are about 160 - 180. Had to get one last year for my car.



The same engine was used in the later model Mk1 focus as well with the same problems.

Hal1 Registered User
#10

Get an OEM one if you need it replaced. A spurious coilpack won't last. Speaking from experience here!

#11

Hal1 said:
Get an OEM one if you need it replaced. A spurious coilpack won't last. Speaking from experience here!



Cheap spurios ones don't last.

McWotever Registered User
#12

Coil pack replaced as were the plugs, and no improvement.

No corrosion on HT leads.

Noticed a small leak from the exhaust, from the new joint between the cat and the centre box, ran out of exhaust sealant so still a small leak, that wouldnt cause the problem would it?

Meant to say that the engine thru a certain range interfered with the radio, which led me to believe it was a HT problem.

At a loss now, think i'll have to bite the bullet and get a diagnostic ran on it.

#13

McWotever said:
Coil pack replaced as were the plugs, and no improvement.

No corrosion on HT leads.

Noticed a small leak from the exhaust, from the new joint between the cat and the centre box, ran out of exhaust sealant so still a small leak, that wouldnt cause the problem would it?

Meant to say that the engine thru a certain range interfered with the radio, which led me to believe it was a HT problem.

At a loss now, think i'll have to bite the bullet and get a diagnostic ran on it.



Replaced with a new coilpack or second hand?

If new then use a spray bottle to spray water over the HT leads while the engine is running. If there is a break anywhere you may see the spark coming out of any damaged area.

McWotever Registered User
#14

Brand new. Will try that trick in the mornin.

Tested both old and new coil pack with a multimeter, both gave the same reading, both outside of the range stated in the Haynes manual.

George Dalton Registered User
#15

Did you gap the plugs before you fitted them?

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