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Topic: Low MPG on 24 valve Cossie (Read 3355 times) |
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Nunnspoet
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Low MPG on 24 valve Cossie
« on: Jun 5th, 2010, 9:31am » |
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Around town I get 17-19mpg. As expected.
Long distance Motorways and dualed A roads at best 22mpg. This is just driving at reasonable speeds within the Speed limits. No hard driving, just trying to up the overall mpg.
I removed the EGR some time ago and blocked the orifice in the exhaust and in the inlet manifold with 2x1p pieces. No leaks as far as I know. Also at this time, 2years ago, the mpg was as above.
I have got some fault codes from my borrowed Axex Peppers lead:
PO138 OS CHV (B1S2)
PO138 OS CHB (B2S20)
P14O1 DPFEGRCH1
P1131 LOH O2S1S115 - SIL - P1131 Lack of HO2S11 Switches - sensor indicates lean (see P2195).
P1401 Diff pressure feedback EGR Circuit High Input.
OK, I know that the 2 post cat sensors are us but believe that they have no influence on performance or fueling. I know that the EGR is removed. It was busted and I could not afford a new one and I believe that it also has not influence over fuelling or performance.
She did have a hesitation at tickover which was there before Bill re-loomed, re-wired her, and re-shelled the Big ends and was there when I got her back from him. But that has almost dissapeared now and I expect it will with a few more miles on the clock.
She drives like a dream whichever way I drive her but the bad MPG is killing my pleasure so please help me out folks.
Mike 
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tlundkvi
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Ex. Scorpio 2.9 24V -95
Posts: 909
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Re: Low MPG on 24 valve Cossie
« Reply #1 on: Jun 5th, 2010, 12:18pm » |
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The P1131 indicates a front lambda sensor is bust, it may have quite a negative impact on fuel consumption. I would check live data on both of them. A lambda sensor is supposed to last only 60K, above this is luck.
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Nunnspoet
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Re: Low MPG on 24 valve Cossie
« Reply #2 on: Jun 5th, 2010, 12:45pm » |
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Thanks tlundkvi. I have a repacement lambda sensor and will get around to fitting it, possibly today. It is a real pain to do as I have to remove the Oil filter in order, hopefully, to get at the sensor. If I cut a ring spanner to around 4inches long I might just be able to access the sensor from the top. Fingers crossed.
Mike
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tlundkvi
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Ex. Scorpio 2.9 24V -95
Posts: 909
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Re: Low MPG on 24 valve Cossie
« Reply #3 on: Jun 5th, 2010, 4:57pm » |
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on Jun 5th, 2010, 12:45pm, Nunnspoet wrote:Thanks tlundkvi. I have a repacement lambda sensor and will get around to fitting it, possibly today. It is a real pain to do as I have to remove the Oil filter in order, hopefully, to get at the sensor. If I cut a ring spanner to around 4inches long I might just be able to access the sensor from the top. Fingers crossed.
Mike |
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Hopefully it does the trick.
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tonyboy
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black2.924Vcoss ( No More )
  
 
Posts: 998
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Re: Low MPG on 24 valve Cossie
« Reply #4 on: Jun 5th, 2010, 7:28pm » |
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I thought the lambda sensors was on the exhaust just under the autobox pan ........
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I think i'm going, erm what do you call it..... Senial.... 
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gozz
Senior Member
Been around awhile
Posts: 3475
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Re: Low MPG on 24 valve Cossie
« Reply #6 on: Jun 5th, 2010, 8:34pm » |
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Tony.
They are the post cat sensors,the pre cat are the ones that affect performance.
GOZZ.
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tonyboy
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black2.924Vcoss ( No More )
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Re: Low MPG on 24 valve Cossie
« Reply #7 on: Jun 5th, 2010, 8:50pm » |
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Ahhh. sensors before and after the cat........... 
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I think i'm going, erm what do you call it..... Senial....
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Matt
Senior Member
Manual'd and a 4.0 in the making
Posts: 2816
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Re: Low MPG on 24 valve Cossie
« Reply #8 on: Jun 6th, 2010, 9:01pm » |
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talking to a friend of mine who knows the 24v's very well he says that the post cat sensors arnt really needed and dont affect the car if they fail. he said it will throw a hissy fit and run funny for a while then carry on as if nothing had happened lol
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FDS2000 Scans - Birmingham
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Mike H
Senior Member
Renault Clio
Posts: 2594
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Re: Low MPG on 24 valve Cossie
« Reply #9 on: Jun 7th, 2010, 3:50pm » |
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on Jun 5th, 2010, 8:50pm, tonyboy wrote:| Ahhh. sensors before and after the cat........... |
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Yep.
@ NP the EGR valve (exhaust gas recirculation) is what gives you your fuel economy if you're going to have any. But you can't cos you've blocked it off. There's an article mentions what it does on this site; what it does is bleed a proportion of exhaust gas (which is essentially an inert gas) into the inlet manifold, what this means is that for the cylinder capacity remaining the same, you actually get less fuel and air going in, in other words, your total engine capacity becomes magically smaller. Therefore, less fuel used, so it goes further. Obviously this is only meant for minimal load, e.g. constant speed cruising (not "booting it"  ).
EGR valves can also get permanently stuck closed cos they're all sooted up, as mine used to often, this would usually cause it to fail gas emissions for the MOT, until it was soaked overnight to clean it so it opened properly. Yep it affects how much fuel is used for idling as well.
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Mike H
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Nunnspoet
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I love YaBB 1G - SP1!
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Re: Low MPG on 24 valve Cossie
« Reply #10 on: Jun 9th, 2010, 7:01am » |
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Thanks everybody for all your advice. After hours of trying to remove the old Sensor I gave up and got it done by my friendly local Garage. He had a hard time but it is done now.
Mike H. So my lack of an EGR valve is one of the causes for my poor fuel economy. Didn't know that it had this affect. But I do now, thank you.
Ages ago I removed the EGR because the washer on the end of the pipe to the Exhaust was not secure and 112pounds Sterling was out of the question.
Thanks again.
Mike 
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Nunnspoet
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Re: Low MPG on 24 valve Cossie
« Reply #12 on: Jun 9th, 2010, 11:32am » |
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Didn't see anything for me, but thanks for your trouble. Interesting though.
Mike
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Nunnspoet
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Re: Low MPG on 24 valve Cossie
« Reply #13 on: Jun 11th, 2010, 8:16am » |
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Ok. Well here goes: We went from Chard to Exeter and back yesterday with new pre Cat. Bank 1 Sensor fitted. I have done my sums in K's, and Litres using the Dash trip, not the trip above the drivers side dash glove box as it is busted.
Result: 9.8Kilometers to 1Ltr petrol. Therefore 70ltrs (1Tank full) = 688kilometers. I can hardly believe these figures they are such an improvement. "Have I made a mistake"?, keeps popping up in my mind, so I have checked my figures over and over but they are correct.
Yeeeeehhaaa!
Mike
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5stud
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Re: Low MPG on 24 valve Cossie
« Reply #14 on: Jun 11th, 2010, 10:43am » |
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havent you heard the government is going back to good old mpg when claming expences.do you live in chard
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Nunnspoet
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I love YaBB 1G - SP1!
Posts: 798
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Re: Low MPG on 24 valve Cossie
« Reply #15 on: Jun 11th, 2010, 10:51am » |
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Yup and a good job too and Yup again I do live in Chard.
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tlundkvi
Full Member
Ex. Scorpio 2.9 24V -95
Posts: 909
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Re: Low MPG on 24 valve Cossie
« Reply #16 on: Jun 11th, 2010, 10:58am » |
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on Jun 9th, 2010, 11:32am, Nunnspoet wrote:Didn't see anything for me, but thanks for your trouble. Interesting though.
Mike |
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I thought of the EGR pipe for £25+p&p, but in your case only the valve was broken?
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Highlander
Moderator
Expert
13 Scorpios, XR4x4, Suzuki SJ413 for off road :)
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Re: Low MPG on 24 valve Cossie
« Reply #17 on: Jun 11th, 2010, 6:47pm » |
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on Jun 11th, 2010, 8:16am, Nunnspoet wrote:Ok. Well here goes: We went from Chard to Exeter and back yesterday with new pre Cat. Bank 1 Sensor fitted. I have done my sums in K's, and Litres using the Dash trip, not the trip above the drivers side dash glove box as it is busted.
Result: 9.8Kilometers to 1Ltr petrol. Therefore 70ltrs (1Tank full) = 688kilometers. I can hardly believe these figures they are such an improvement. "Have I made a mistake"?, keeps popping up in my mind, so I have checked my figures over and over but they are correct.
Yeeeeehhaaa!
Mike
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I make that 27 mpg Mike, sounds about normal
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on Oct 17th, 2011, 12:35pm, Simmo wrote:I give up !  Too much for an old boy! |
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a900one
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A scorpio is for life not just for christmas
Posts: 980
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Re: Low MPG on 24 valve Cossie
« Reply #18 on: Jun 11th, 2010, 6:53pm » |
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I work that out at 27.8 mpg, but my maths is prone to mistakes.
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a900one
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A scorpio is for life not just for christmas
Posts: 980
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Re: Low MPG on 24 valve Cossie
« Reply #19 on: Jun 11th, 2010, 6:55pm » |
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You just got in before me Highlander.
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