1999 1.8 zetec Mk2 Mondeo. Had this problem since I bought it a year
ago. Revs drop slowly when I come of accelerator or changing gear.

If I'm in 3rd gear about 1300-1500 rpm and come off accelerator. Revs
hardly drop for 3-5 seconds and either forced to wait until they very
slowly fall or have to change down or brake to reduce speed. Very
tiring to drive around town.

It did improve it very slightly by cleaning air intake butterfly. Had
some black goo around butterfly edges. Cleaning with carb cleaner
helped and gives me some feeling of engine braking for some of the
time, but revs still dropping very slowly when I come off accelerator.
Drives a bit like a 1970's Ford auto gearbox. Appears to coast when I
come off accelerator.

Shows no error codes on handheld tester. Not been on Ford workshop
computer.

Rockingrabbit

Rockingrabbit wrote:
1999 1.8 zetec Mk2 Mondeo. Had this problem since I bought it a year
ago. Revs drop slowly when I come of accelerator or changing gear.

If I'm in 3rd gear about 1300-1500 rpm and come off accelerator. Revs
hardly drop for 3-5 seconds and either forced to wait until they very
slowly fall or have to change down or brake to reduce speed. Very
tiring to drive around town.

It did improve it very slightly by cleaning air intake butterfly. Had
some black goo around butterfly edges. Cleaning with carb cleaner
helped and gives me some feeling of engine braking for some of the
time, but revs still dropping very slowly when I come off accelerator.
Drives a bit like a 1970's Ford auto gearbox. Appears to coast when I
come off accelerator.

Shows no error codes on handheld tester. Not been on Ford workshop
computer.

Rockingrabbit

if it is the same as a focus (almost certainly) then you must not use carb
cleaner on the butterfly, there is a label warning you against it on the
throttle body. checking the output of the throttle position sensor should
help with diagnosis, anything over a volt (should be 0.7) and the revs will
stay high longer (between pins 2 and 3 , the lower two in the plug with it
conected)

On 30 Aug, 19:05, "Mrcheerful" wrote:
Rockingrabbit wrote:
1999 1.8 zetec Mk2 Mondeo. Had this problem since I bought it a year
ago. Revs drop slowly when I come of accelerator or changing gear.

If I'm in 3rd gear about 1300-1500 rpm and come off accelerator. Revs
hardly drop for 3-5 seconds and either forced to wait until they very
slowly fall or have to change down or brake to reduce speed. Very
tiring to drive around town.

It did improve it very slightly by cleaning air intake butterfly. Had
some black goo around butterfly edges. Cleaning with carb cleaner
helped and gives me some feeling of engine braking for some of the
time, but revs still dropping very slowly when I come off accelerator.
Drives a bit like a 1970's Ford auto gearbox. Appears to coast when I
come off accelerator.

Shows no error codes on handheld tester. Not been on Ford workshop
computer.

Rockingrabbit

if it is the same as a focus (almost certainly) then you must not use carb
cleaner on the butterfly, there is a label warning you against it on the
throttle body. *checking the output of the throttle position sensor should
help with diagnosis, anything over a volt (should be 0.7) and the revs will
stay high longer (between pins 2 and 3 , the lower two in the plug with it
conected)- Hide quoted text -

- Show quoted text -

Ok, I'll try that and thanks for position of pins as will make it much
easier. Didn't see any warning label. Local garage suggested there was
probably black goo around butterfly and this might help and it
certainly has. He just said not to squirt back up towards air filter
as there is something delicate (sensor ?) that does not take kindly to
carb cleaner. He warned me there would be a bit of white smoke and
rough running for a few seconds when started. I let carb clearner
evaporate as wasn't happy about that going through my fairly new cat,
but worth it for the improvment.

Rabbit