cliftyhanger
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| posted on 26/1/11 at 05:00 PM |
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Tintop emissions help
My sisters aged Fiesta has failed its MoT on emissions. It is a 1993 "classic" jobbie with the 1.1 ohv engine and a singlepoint injection.
It hardly gets used, and then around town. So my question is, can I assume a new lambda sensor and probably air filter, plus a beating should do the
trick? I know a good thrash may even do it, but as the MoT expired a couple of months ago I dont want to get caugt by th eplod in a nigh on 20 year
old fiesta with no MoT
Any other idea chaps (and chapesses)
Cheers!
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MkIndy7
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| posted on 26/1/11 at 05:27 PM |
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Mine just used to need an oil change to get it through the MOT, presumably it was burning oil (not noticably) but as long as it was clean oil it
lowered the emissions enough to pass the test lol
Think that had about 70,000 miles on it.
The new Lambda sencor would probably be worth more than the car lol
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cliftyhanger
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| posted on 26/1/11 at 05:30 PM |
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This one has about 40K on it, and is actually very tidy if a bit faded (solid red paint )
New lambdas can be had for about £15 off the bay  got my dads primeira through a MoT a few years ago, so they must work.
I still recokon the blast is probably all thats needed, but £20 for a lambda and filter can't be bad value. May get one ordered up.....
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britishtrident
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| posted on 26/1/11 at 05:47 PM |
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If it has an egr valve clean it, clean the idle speed control valve.
Check the ignition -- plugs leads and coil pack.
Check inlet and exhaust for air leaks.
Check engine is getting up to temperature -- ie thermostast is working.
tune Up
Then give it an Italian Tune Up
If the lambda lambda sensor as done more than 80k it will be starting to get tired but you can check it by conecting to a DMM and measuring the
output voltage, when the engine is at idle the voltage should jump up and down between about 0.2 and 0.8 v about twice a second.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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perksy
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| posted on 26/1/11 at 05:57 PM |
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What did it Fail on ?
Was it CO, Hc's. Llambda or what ?
That would help narrow down the problem 
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cliftyhanger
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| posted on 26/1/11 at 06:06 PM |
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4.7% co (that must be a fail)
400ppm HC (sounds OK?)
lambda 0.88/0.82 FAIL (sis gave me some other numbers, 0.89 and 1.09 but I haven't seen the bit of paper myself)
Will hopefully have a look at it all in the morning, unless skool calls and wants me.
[Edited on 26/1/11 by cliftyhanger]
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DRC INDY 7
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| posted on 26/1/11 at 06:23 PM |
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This used to happen a lot to early fords with oxy sensors and cats the 1st thing to try is the oxy sensor remove it and clean the tip with carb
cleaner it will probs be sooted up do a oil and filter change and that should do it
If when removed you find it's not sooted up then you may need a new oxy sensor but check for air leaks before on the inlet side and exhaust
before the sensor because a air leak will cause it to run rich
ps there is no egr vale on that model
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Puddle Dodgers Club
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rusty nuts
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| posted on 26/1/11 at 07:51 PM |
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Common problem on old Fords , check the coolant sensor.
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Benzine
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| posted on 26/1/11 at 07:56 PM |
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How old is the fuel in the tank? my car failed MOT test on emissions last year, 5% CO. Fresh fuel (stuff in the tank was v.old) bought it down to 1.5%
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cliftyhanger
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| posted on 2/2/11 at 10:36 AM |
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Damn and blast
I took the car for a damn good thrashing (first one I suspect since last MoT) and back to the mot station. Very helpful chappie who is an ex-pupil, so
no bull involved.
anyway, the emissions still a bit high, and as he put it failing everywhere so the cat looks the suspect.
I order a new cat (£50, so pretty cheap) and a new lambda (£13)
All arrives and fitted over the weekend. Bog sis takes car in yesterday (she actually gave it a fast run first after I insisted) and some fresh
petrol.
Failed again. MoT man a bit puzzled too. Not far off, he reckoned the lambda may have iffy connections (it was a universal one, so cut the old plug
off and used the supplied crimp connectors) but readings do change so I doubt that is the problem. The lambda is before the cat connection, and I
couldn't detect any exhaust leaks before the lambda, however the seal to between the downpipe and new cat is OK but not perfect when using the
old "hand over the exhaust" test. Doesn't seem to blow though when normal running. And can't use exhaust paste? because of the
cat.
He suggested the new cat could be faulty (thats helpful, bet the supplier will refuse any refund!) or air temp sensor, not sure where that is though
on this pos plus losing interest rapidly.
So before the thing catches fire, any more ideas?
Pleeeeease
Cheers
Clive
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coyoteboy
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| posted on 2/2/11 at 11:36 AM |
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High CO and low HC suggests you're running very rich. If it's not misfiring (would normally raise HC) I'd have checked temp sensors
first, easy to test and cheap to replace.
[Edited on 2/2/11 by coyoteboy]
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