Surging on deceleration - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
Mercury Cougar Forum Forum for discussion of the Mercury Cougar.

 
LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 08-25-12, 08:10 AM Thread Starter
Registered User
 
Join Date: Mar 2012
Posts: 39
Surging on deceleration

Hi all,
My 2002 w/5-speed has a curious RPM trait when decelerating or coasting down in gear with the clutch engaged. Seems it has 2 levels of compression braking; Hi & Low. I'll try to explain it in an understandable manner below:

When removing my foot from the accelerator pedal, compression braking will start dropping speed at one level then shift to a more noticable level then go back to the less severe level. I'd sure like to get the more severe level on a regular basis. This happens in all gears.

It almost seems like the throttle will hang at a higher RPM & then drop to a lower RPM & then repeat the cycle. Is there an electric 'dash-pot' idle control arrangement on the injector system that I could disconnect?

Any ideas/thoughts?

rmmpe is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 08-25-12, 09:17 AM
2002 F150 XLT
 
Bert's Avatar
 
Join Date: Nov 2008
Location: Oregon
Posts: 10,344
Re: Surging on deceleration

It may be the IAC sticking. Try cleaning it to see how it does.

Bert
Bert is offline  
post #3 of 5 (permalink) Old 08-25-12, 01:34 PM Thread Starter
Registered User
 
Join Date: Mar 2012
Posts: 39
Re: Surging on deceleration

Thanks for the reply.
But I need further clarification - what is the IAC & where is it?
rmmpe is offline  
post #4 of 5 (permalink) Old 08-25-12, 02:34 PM
2002 F150 XLT
 
Bert's Avatar
 
Join Date: Nov 2008
Location: Oregon
Posts: 10,344
Re: Surging on deceleration

It's the idle air controller. Depends on what engine it is. This may help. Where is the idle air control valve (iac) on a 2000 mercury cougar? - Yahoo! Answers

Bert
Bert is offline  
post #5 of 5 (permalink) Old 08-25-12, 04:19 PM Thread Starter
Registered User
 
Join Date: Mar 2012
Posts: 39
Re: Surging on deceleration

Thanks, Bert.
Got it now and will do as suggested.
rmmpe is offline  
Sponsored Links
Advertisement
 
Reply

  Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars > Ford Cars and PAG Vehicles > Mercury Cougar Forum


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome