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Topic: itermitent fault (Read 828 times) |
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ultima4
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itermitent fault
« on: Aug 15th, 2011, 8:30am » |
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i went to the battlebridge ford show over the w/end on way there the car started jerking with little responce to the thottle then sudenly pick up and seemed ok .then on the way back same fault it only happened when doing about between 50 and 60 mph 'engine ticks over ok no missfire either.the only other thing that happened was the t.c.s and abs light came on.when i turned engine off and turned back on after ten miniets lights were not on.any idears folks. its a 1998 2.scorpio auto.thanks geoff.
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Cosray
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8th Scorpio, 2nd Cosworth: currently '95
Posts: 569
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Re: itermitent fault
« Reply #1 on: Aug 15th, 2011, 12:38pm » |
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Hi Geoff,
looms in good order?
Looks like your faults start after a while and then cease, usually because of heating up bad cabling.
Especially the one next to the exhaust manifold "engine compartment loom" running from the big grommet in the firewall to the two cubic-shaped connectors and under the ABS module?
Very suspect.
Also visually inspect a fork coming off this loom near the firewall and up to the three-pin EGR Differential Valve Control Sensor. It sits on its own straight in frornt of the steeringwheel in a RHD. It is the box with the two rubber tubes.
The three wires down at the fork are subject to heat and shorting causing EGR to switch on/off at the speeds mentioned injecting exhaustgasses into the inlet manifold.
Very suspect.
Read here: http://www.fordscorpio.co.uk/egr.htm
If that fails do inspect the loom over the injectors for brittle isolation and bad splices.
HTH
Ray
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: itermitent fault
« Reply #2 on: Aug 16th, 2011, 2:42pm » |
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FWIW mine did that regular until MAF was replaced (as well as filters and cat)
No amount of cleaning the MAF made any difference, it was basically kn@ckered.... had just gotten too old I think (?)
TCS & ABS lights may be a separate 'issue'....
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Mike H
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ultima4
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I'm a YaBB newbie!
Posts: 149
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Re: itermitent fault
« Reply #3 on: Aug 17th, 2011, 8:23pm » |
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hi guys check wirering seems all ok .im going to fit a new map sensor this w/end as advice.i have cleaned the old one a few times but no joy.anyway thanks for your advice i will see how it goes,cheers geoff
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: itermitent fault
« Reply #4 on: Aug 18th, 2011, 1:38pm » |
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As a quick simple test you can unplug the MAF and try it like that, car will work in open-loop fuelling mode, if that cures the jerking then that's the kiddie at fault (MAF) 
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Mike H
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Cosray
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8th Scorpio, 2nd Cosworth: currently '95
Posts: 569
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Re: itermitent fault
« Reply #5 on: Aug 18th, 2011, 1:53pm » |
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Smart check Mike!
Good for eliminating and homing in on the culprit.
Ray
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ultima4
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I'm a YaBB newbie!
Posts: 149
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Re: itermitent fault
« Reply #6 on: Aug 20th, 2011, 7:22pm » |
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HI GUYS.FITTED NEW MAF SENSOR TODAY NEW ONE ON E/BAY 50 QUID TAKEN CAR ON RUN SEEMS OK FINGERS CROSSED. NEX JOB ITS TO CHANGE AUTO OIL AND FILTER ENY ONE RECERMEND THE RIGHT OIL FOR THE JOB.1998 2.3 ULTIMA THANKS FOR ALL YOUR HELP. 
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: itermitent fault
« Reply #7 on: Aug 21st, 2011, 6:17pm » |
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So there you go 
There were or was other topics about auto oil changing, is there instructions in the How To section at all?
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Mike H
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Simmo
Administrator
I'm an OAP !
Posts: 5508
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Re: itermitent fault
« Reply #8 on: Aug 21st, 2011, 8:25pm » |
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Have a look at This page
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Now I'm an OAP
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: itermitent fault
« Reply #9 on: Aug 22nd, 2011, 12:28pm » |
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Oh yeah found that, but sure there were previous topics about it as well (?)
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Mike H
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