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Topic: erratic idle after 1 minute (Read 772 times) |
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pedropedro
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Posts: 677
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erratic idle after 1 minute
« on: Sep 14th, 2010, 8:11pm » |
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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
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Cosray
Full Member
8th Scorpio, 2nd Cosworth: currently '95
Posts: 569
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Re: erratic idle after 1 minute
« Reply #1 on: Sep 19th, 2010, 8:55pm » |
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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
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pedropedro
Full Member
Posts: 677
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Re: erratic idle after 1 minute
« Reply #2 on: Sep 19th, 2010, 10:25pm » |
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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
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Cosray
Full Member
8th Scorpio, 2nd Cosworth: currently '95
Posts: 569
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Re: erratic idle after 1 minute
« Reply #3 on: Sep 20th, 2010, 9:18am » |
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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
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