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 Posted: Sun Sep 08, 2013 4:29 am |
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Joined: Sep 05, 2013
Posts: 48
Trade Rating: 0
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hi guys still getting my head round with a big problem with very low mpg on my auto 1,4 206.
was told to check my map sensor i cant tell by just looking at if its bad but i did sense it had a fair amount of oil on it is this normal or could this be the issue???
also i was told to check the lambda sensor as this affects mpg any one know where it is i cant locate it
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Posted: Sun Sep 08, 2013 5:01 am |
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Joined: Oct 10, 2012
Posts: 1917
Trade Rating: +13
Location: Spalding
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Give the map sensor a clean with carb cleaner may as well do the throttle body while you are at it. The lambda sensor is on the manifold on my car.
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Posted: Sun Sep 08, 2013 5:41 am |
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Joined: Dec 03, 2012
Posts: 96
Trade Rating: 0
Location: Doncaster
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| Life would be easier with universal jointed arms and fingers sometimes | |
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Posted: Sun Sep 08, 2013 7:20 am |
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Joined: Sep 05, 2013
Posts: 48
Trade Rating: 0
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hi guys thanks ive already cleaned the throttle body cant get ma head round the low mpg hope its one of these two
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Posted: Sun Sep 08, 2013 7:44 am |
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Joined: Dec 03, 2012
Posts: 96
Trade Rating: 0
Location: Doncaster
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Have you had it scanned for fault codes? Just because the engine management light isn't on doesn't mean there wont be any. Makes diagnostics so much quicker and easier.
Regards, Richard.
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| Life would be easier with universal jointed arms and fingers sometimes | |
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Posted: Sun Sep 08, 2013 11:53 am |
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Joined: Sep 05, 2013
Posts: 48
Trade Rating: 0
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hi not had it scanned for that i presume any garage would be able to do this right?
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Posted: Mon Sep 09, 2013 12:25 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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The problem with codes is that some of them may be very old. Some cars store the data for a very long time and don't show the date that it was recorded.
So if you are having it code read be a little careful of the results. Personally I prefer to get the codes cleared and then get it re-read a few days later but that does cost money unless you have a friendly mechanic..
You won't have the test kit to test a lambda sensor as that needs live data from a reader or osciliscope and, apart from a broken lambda sensor cable, you can't really see if they are defective just by visual inspection.
You must also make sure the rest of your car is working as it should with particular check that you don't have an exhaust leak.
With an exhaust leak not only do exhaust gases escape but air (containing 02) will get into the exhaust system. The lambda sensor will "see" the extra 02 and send that "lean" signal to the ecu. The ecu will call for more fuel to correct the aparent lean running so your car will run rich and suffer low mpg. A rich running car will also quite quickly damage your catalytic converter.
It could be a defective temp sensor. Note that some 206s have two sensors. One controls the temp gauge and the other sends its signal to the ECU. If the sensor is defective the signal to the ECU may be telling the ECU that the engine is cold. In this situation the ECU will ask for extra fuel and you will suffer low mpg. Note that Some 206s have a single sensor but it is 2 in 1 with one signal for temp gauge and one signal to ECU. Some 206s have two completely seperate sensors in two different locations. I am not sure what sensor(s) yours has but don't rely on the fact that your temp gauge is showing the car as up to temp to confirm that the sensor for the ECU is working correctly - the ECU signal is from a different source.
If your thermostat is defective the engine may not get hot so again you will use excessive fuel. defective thermostats are relatively common.
Moving away from the engine it could be sticking brakes. That wouldn't be a first either.
When was the car last serviced with filters and oil change etc. It does take a very long time for an air filter to clog, quite a bit longer than the recommended change frequency, but it is worth considering and checking the air filter.
have you recently had any work done to the car and could it be related to that work?
Finally, what you haven't stated is what type of journey you are doing, what mpg you are getting, how you drive and what mpg you were previously getting nor whether it was sudden or gradual increase in consumption.
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| Morris 1000, Austin 1100, Escort Mk2, Fiat Mirafiori, Alfa 33, Alfa GT Junior, Alfasud, Alfetta GTV (2x), Alfa 164 3.0 V6, Alfa 164 2.0, Alfa 75 V6, Alfa 156 2.4 (diesel remapped 200bhp), Alfa 147 GTA (3.6 295bhp), Alfa 159 (diesel remapped 245bhp 300ft.lbs @ 2500rpm)
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Posted: Tue Sep 10, 2013 8:10 am |
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Joined: Sep 05, 2013
Posts: 48
Trade Rating: 0
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hi thanks for your reply kandlbarrett
im having the throttle changed because i was told that the sensor may be giving the wrong information and thus leading to more fuel etc mixed with the air as a i know someone who works in garage had the same problem with his 206 swapped the throttle body and it worked
so im changing that and the map sensor im doing local RUNS im getting about 20 mpg according to the calculators on net
bought the car 2 months ago had this problem since the rest of car is runing ok had it serviced 3 weeks ago everything WAS CHANGED
when i change these two will i have to reset the car???
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