Ford Scorpio Forum - Print Page


    
      
        Ford Scorpio Forum
        (https://www.fordscorpio.co.uk/cgi-bin/yabb/YaBB.pl)
      

        General >> Problems >> erratic idle after 1 minute
        
(Message started by: pedropedro on Sep 14^th, 2010, 8:11pm)

Title: erratic idle after 1 minute
Post by pedropedro on Sep 14^th, 2010, 8:11pm

its a 2.3 and idles fine nice smooth until precisely one minute after foot off...then goes lumpy....cleaned control valve
there must be some timer that comes in at that time maybe gas recirc,,, egr is that it ? any help appreciated as its very annoying

john

Title: Re: erratic idle after 1 minute
Post by Cosray on Sep 19^th, 2010, 8:55pm

Hi John, is your problem still valid?

How does the car drive when it is NOT idling: does it have full power, acceleration, smoothness? Top speed?

HAve you read-out OBD perhaps?

Are any heavy users on like windshieldheaters, dragging airco pump?

EGR plays no part until 2,000 revs under load but... is the valve leaking perhaps?

Is this minute precisely one minute or a good guess?

What model/year/autobox/options?

Curious,

Ray

Title: Re: erratic idle after 1 minute
Post by pedropedro on Sep 19^th, 2010, 10:25pm

yes still valid

yes runs ok except there is a resonance at 2k rpm ..had head reworked and i have been told maybe chain isnt correctly positioned

but its got power etc...did have code lean p0171 i think ..something just seems to time in after 60 secs maybe 45 and it goes lumpy...no air leaks i can hear/see ...2.3/auto

issue isnt affected by load
john

Title: Re: erratic idle after 1 minute
Post by Cosray on Sep 20^th, 2010, 9:18am

John read here:

http://www.fordscorpio.co.uk/idleprob.htm

and here:

http://www.fordscorpio.co.uk/pooridle.htm

to acquaint yourself with various problems and solutions concerning poor idling.

The lean code in itself could be produced by one of your lambda and H2O sensors and may be indicative for your problem.

All 4 of them are heated and may well, after say a minute of operation, reach a new state which causes the specs to fall outside normal operation boundaries.

The Component Monitor and the EEC-V may respond to that out-of-range situation by losing control, perhaps even LOS.

Read here:

http://www.fordscorpio.co.uk/ccmonitor.htm

My suggestion would be to obtain a complete OBD-read-out before and after the problem. It will probably show some interdependent problems causing this predictable nuisance.

HTH
Ray

PS DTC / Errorcodes here:

http://www.fordscorpio.co.uk/codes.htm