A colleague has asked me to post this for him, as he's not au fait with
usenet.  He has a 1995/M Mondeo 1.8. The engine is a Zetec lump.

His complaint:  when braking to a halt, the engine revs remain at c.
1400ropm for a few seconds after the car has come to a halt.  They then
drop to around normal idle speed, then the engine "hunts" in quite a
distinctive, regular up-and-down fashion (almost as if he were gently
pressing and releasing the throttle, though he isn't) with a cycle of
about 1.5 seconds.

Where should he start looking for the problem?  (He replaced the vacuum
Y-pipe behind the throttle body that is known to split a couple of years
ago.)

Many thanks for any suggestions or ideas.

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"Mike Tomlinson"  wrote in message 
news:pDBSXKA27XuCFwX7@jasper.org.uk...

>
> A colleague has asked me to post this for him, as he's not au fait with
> usenet.  He has a 1995/M Mondeo 1.8. The engine is a Zetec lump.
>
> His complaint:  when braking to a halt, the engine revs remain at c.
> 1400ropm for a few seconds after the car has come to a halt.  They then
> drop to around normal idle speed, then the engine "hunts" in quite a
> distinctive, regular up-and-down fashion (almost as if he were gently
> pressing and releasing the throttle, though he isn't) with a cycle of
> about 1.5 seconds.
>
> Where should he start looking for the problem?  (He replaced the vacuum
> Y-pipe behind the throttle body that is known to split a couple of years
> ago.)
>
> Many thanks for any suggestions or ideas.
>


could it be the servo diaphram? letting in air, try removing the vac pipe 
from that and blocking it off and see if the hunting etc goes? I am not a 
expert mind you just a DIYER!

In article , nospam@nospam.jasper.org.uk 
says...

> 
> A colleague has asked me to post this for him, as he's not au fait with
> usenet.  He has a 1995/M Mondeo 1.8. The engine is a Zetec lump.
> 
> His complaint:  when braking to a halt, the engine revs remain at c.
> 1400ropm for a few seconds after the car has come to a halt.  


This behaviour is normal, but the revs seem a bit high.


> They then
> drop to around normal idle speed, then the engine "hunts" in quite a
> distinctive, regular up-and-down fashion (almost as if he were gently
> pressing and releasing the throttle, though he isn't) with a cycle of
> about 1.5 seconds.
> 
> Where should he start looking for the problem?  (He replaced the vacuum
> Y-pipe behind the throttle body that is known to split a couple of years
> ago.)


I'd start by having a look at the idle control valve. His idle control 
isn't very good, so the valve that controls it may be faulty.

Pete.

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Hi Mike

Generally Zetec's will keep the revs high for a short period but there's a 
few other possible problem area's, a duff Idle speed regulator, the switch 
on the clutch pedal may need adjusting, you may also have a leak on the 
plenum chamber seal causing unmetered air to enter the system, or lastly a 
duff MAF.

"Mike Tomlinson"  wrote in message 
news:pDBSXKA27XuCFwX7@jasper.org.uk...



> A colleague has asked me to post this for him, as he's not au fait with
> usenet.  He has a 1995/M Mondeo 1.8. The engine is a Zetec lump.
>
> His complaint:  when braking to a halt, the engine revs remain at c.
> 1400ropm for a few seconds after the car has come to a halt.  They then
> drop to around normal idle speed, then the engine "hunts" in quite a
> distinctive, regular up-and-down fashion (almost as if he were gently
> pressing and releasing the throttle, though he isn't) with a cycle of
> about 1.5 seconds.
>
> Where should he start looking for the problem?  (He replaced the vacuum
> Y-pipe behind the throttle body that is known to split a couple of years
> ago.)
>
> Many thanks for any suggestions or ideas.



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..    Steve    ..
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