High revs when clutch depressed

Mustang, Taurus, Tempo and Cougar. Town Car, Mercury and Escort.
Ask our auto mechanics for help to all your Ford car questions.
Post Reply New Topic
charliebrownboy
Posts: 4
Joined: Sat Aug 23, 2014 4:01 pm

High revs when clutch depressed

Unread post by charliebrownboy » Tue Mar 17, 2015 4:56 pm

I have a 1998 1.8 zeetec petrol ford focus. I have a problem that when I press the clutch in, the revs go high until the selected gear is engaged when it returns to a reasonable level. When in neutral the revs idle normally and the engine is smooth. It only happens when the clutch is depressed. any help would be appreciated. Thank You in anticipation

 

User avatar
carriedi
Posts: 2279
Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: High revs when clutch depressed

Unread post by carriedi » Tue Mar 17, 2015 11:13 pm

so have you had your car scanned to see what is happening when the idle revs? Does the TPS go all the way down to it's idle position? Have you tried cleaning the IAC? Do you happen to know what model your car would be in the USA? (Escort?) I know that other country models have had issues with the intake manifolds. Some idle flare was programmed if on updated software. Iad would open while driving and when the clutch pedal is depressed creates a vacuum leak before the computer sees the clutch in and the throttle returned to idle.
Browse "SIMILAR TOPICS" At The Bottom Of This Page.

charliebrownboy
Posts: 4
Joined: Sat Aug 23, 2014 4:01 pm

Re: High revs when clutch depressed

Unread post by charliebrownboy » Wed Mar 18, 2015 2:44 pm

Carriedi,

Thank you for comments. Have had the scan, no probs detected. The revs are high when the clutch is depressed, not when the gear is engaged, when engaging neutral revs return to normal. A clutch switch is fitted to the top of the pedal, do you know what this actually does, and if this switch is defective could this be the problem. Before I get to the IACV, TPS or MAP sensor I wanted to eliminate other possible causes. Any other ideas would be appreciated.
Charliebrown

User avatar
carriedi
Posts: 2279
Joined: Wed Apr 10, 2013 12:42 pm
Location: Oregon

Re: High revs when clutch depressed

Unread post by carriedi » Wed Mar 18, 2015 11:00 pm

a scanner is not just to look for codes. you may have a problem that will not set a code. You may have a "within spec" failure. That's when you you look at your data stream to see what the engine is doing when the condition happens. With a scanner you can graph the data stream and look at you O2 sensor, your fuel trims, your coolant temp, your Idle air control, your throttle position sensor and your speed sensor. Is your TPS going back down normally when you let off the gas? are the fuel trims showing a lean condition that the computer is adding fuel for? Is the IAC reading high adding more air?

Under normal circumstances the only things that raise your idle is the throttle open or too much air. There is a clutch switch that the computer monitors for neutral safety. I don't believe it is used for shifting.

you shouldn't replace any parts without seeing what they are doing. You might want to call your ford dealer and ask them about updated software and/or parts for your particular problem. It is a very common problem for fords.
Browse "SIMILAR TOPICS" At The Bottom Of This Page.

raneger
Posts: 22
Joined: Sun Mar 01, 2015 12:47 am

Re: High revs when clutch depressed

Unread post by raneger » Mon Jun 01, 2015 4:18 am

Try and check this rangerovertransmissionsanjose.com I have my clutch fixed in here and I was satisfied.

Post Reply New Topic
  • Similar Topics
    Replies
    Views
    Last post