mondeo 1.8 misfire

[phoult]

any ideas out there on duratec misfires.already changed plugs,leads and coil pack.oil is 5w30 ford spec.mis fires upto 2400 revs then seems to clear.does not happen all the time,just most of the time.any ideas wecome before the big hammer comes out.

 

[SB118]

Chuck it on an obd reader.

Where are you based?


1st post, and it's in Motors AND it's Mondeo based. You'll fit in well

 

[phoult]

obd reader only shows lean now and then.based in hull

 

[ajstan]

is it mk3? im having that exact problem atm, havnt changed the coil pack yet - i'll watch this thread carefully

 

[Janesy B]

MAF?

 

[phoult]

it is the mk3,let me know if you get yours sorted.will check the maf

 

[Janesy B]

Disconnect the MAF, if it runs better with it off then it'll need cleaning or replacing. This may or may not trigger then engine management light which may or may not clear after a long drive.

 

[Jamous]

MAF?

This first and report back

 

[iaind]

Disconnect the MAF, if it runs better with it off then it'll need cleaning or replacing. This may or may not trigger then engine management light which may or may not clear after a long drive.

If its anything like mine it'll take 30~40 miles to come on and a similar distance to turn off again

 

[Fuzz]

MAF / Lambda sensor

and it would show lean when it misfires anyway so dont confuse yourself there

 

[phoult]

had rac out with his diagnostic machine,checked everything but showed no faults.maf tested ok and lamda reading was fine.any more ideas?

 

[SB118]

Try swapping the MAF for a known good unit (anybody local that you can rob one from?) i've just dealt with a pug hdi which had a duff MAF but it wasn't giving any errors (great method, rely on the broken electronics to tell you it's broken, but what if it's broken!?)

 

[osc89er]

This may be a bit simple but have you checked that the air filter is not now an air blocker?

 

[iaind]

This may be a bit simple but have you checked that the air filter is not now an air blocker?

Had that with mine, although mine's a derv - they only get replaced every 25k miles which is ridiculous

 

[Janesy B]

had rac out with his diagnostic machine,checked everything but showed no faults.maf tested ok and lamda reading was fine.any more ideas?

Disconnect MAF, if car works better, then it's at fault. Don't rely on codes!

 

[phoult]

air filter is new,will get onto maf this weekend.

 

[dalin80]

get a compression test done, had a spate of those zetecs this month with exhaust valves on no3 starting to burn.

 

[Janesy B]

It will have a Duratec engine, not a Zetec.

 

[phoult]

does not have a maf sensor.is a map sensor the same thing?

 

[dalin80]

It will have a Duratec engine, not a Zetec.

close enough, still refer to them as zetecs.