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 Posted: Sat Aug 10, 2013 6:28 am |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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Hi I have 02 gti 140 all of a sudden over the last wk she has dropped from 32.5 mpg to 24 mpg which is was bad any way but a lot worse no 86 miles for £20 anyone got any ideas would be much appreciated ?
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Posted: Sat Aug 10, 2013 3:11 pm |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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Bump
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Posted: Sat Aug 10, 2013 3:16 pm |
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Joined: Feb 07, 2010
Posts: 2632
Trade Rating: +6
Location: Rugby,Warwickshire
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Could be your lamdba sensor on its way out. Its really easy to change yourself!
Has it had a service resently? Change of oil wouldnt go a miss and cleaning your idle control unit will also benefit - (there is a guide on this written up by tom I believe)
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Posted: Sun Aug 11, 2013 1:31 am |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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Before doing anything check the following:-
I assume that you do not have an engine management light lit on the dash, if you do get the codes read.
Is your car getting up to temperature? If the thermostat is failed a cool running engine will use more fuel.
Put a rag over the end of your exhaust with the car running and get a mate to look under the bonnet and under the car to see if you have an exhaust leak in front of any of the lambda sensors. If you do fix the exhaust leak first. An exhaust leak in front of any lambda sensor will upset the engine management system and cause over fuelling.
It could be a leaking injector. Remove each spark plug and see if you have one that is more sooty than the rest - that will point to a problem with that cylinder and possibly that injector. Though it could be the coil pack (usually felt as a misfire), spark plug, valves or rings in that cylinder.
Have you had any recent engine work done to the car or a service? it could be related to that work.
It might also be worth cleaning the map sensor.
Finally excess fuel will kill your cat so get it fixed quickly.
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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)
Why isn't my daughter an Alfaholic? | |
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Posted: Tue Aug 13, 2013 9:44 am |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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It's just had service they is a little hole on exhaust will check whether in from or behond it was a little lumpy on tick over before my mate put a com on and it said coil pack u think that could be problem or could it be the Bosch super 4s that have just gone in I will clean carb and see thanks for help matey
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Posted: Tue Aug 13, 2013 1:37 pm |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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Bump
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Posted: Tue Aug 13, 2013 1:40 pm |
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Joined: Mar 15, 2012
Posts: 327
Trade Rating: 0
Location: Essex
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get a reader on it with live engine data (even cheapish ones off ebay do this) and check the long term and short term fuel trim,see if its the ecu compensating (this is sign of a duff pre-cat lambda or leak between cylinder head and cat) it will also show you the lambda sensor voltages,if bank 1 is constantly low (0.1-0.2v) or very high (0.8-0.9v) then its definately excess/insufficent fuel being burned and not a leak from injectors
depends what kind of driving you do but i wish i was seeing 30+ mpg lol. im lucky to scrape 28 but most my driving is heavy traffic on short trips to work
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| Joined the GTi massive 10/1/13
Goodbye lairy Pugani (quicksilver 1.4)  | |
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Posted: Tue Aug 13, 2013 4:16 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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Fix the hole in the exhaust first, clear the fault codes and see how it goes.
If you still have high consumption then re-read the codes and do live data.
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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)
Why isn't my daughter an Alfaholic? | |
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Posted: Wed Aug 14, 2013 4:06 am |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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Well like I say used to get 32.1 to 31.1 now getting 27.1 and I drive steady
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Posted: Wed Aug 14, 2013 4:15 am |
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Joined: Nov 27, 2010
Posts: 11519
Trade Rating: +10
Location: What's it to you? ? ?
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Your just wasting your time until the exhaust is fixed.
How can you expect the car to run correctly with a faulty exhaust 
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| Toyota C-HR GR Sport 2.0 Hybrid with JBL & Alcantara packs. | |
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Posted: Thu Aug 15, 2013 7:25 am |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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I doin exhaust tomorrow it factory fitted aswell but it was last owner got it fitted
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Posted: Fri Aug 16, 2013 5:56 am |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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Exhaust fixed big hole In back box amd middle joint tight will report back on how it goes now
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Posted: Mon Aug 19, 2013 3:47 am |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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With exhaust fixed lots more power 35 mpg on long roads 25 on round the doors when used to get about 32 all the time do u think brakes could be sticking ?on any more idea ?like I say my mate put cheap compute on long time ago and it said coil pack could it be that u recon how would I know if it was coil pack? Or do u think could have sticky calliper ?
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Posted: Mon Aug 19, 2013 4:12 am |
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Joined: Nov 20, 2012
Posts: 269
Trade Rating: 0
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Checked plugs all lock sutted the same so does that mean cylinders are fine ? But what about coil pack does. That say same for that some times the car has a little stutter when ticking over I going to clean throttle bodie and check calliper s but any feed back on the talk above would be nice thanks
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Posted: Mon Aug 19, 2013 8:07 am |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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The sooted plugs may be from previous problems. I would swap them for new plugs as sooted plugs may affect performance and fault codes and see if the soot or problems return or improve.
After changing the plugs and before going for a drive get all the old codes cleared. Go for a drive of mixed motoring and at least 10 miles and see if any new codes are stored. If possible get live data reading.
A check for sticking brakes is easy, jack the car up and spin the road wheel by hand. Though note that it sometimes takes a few brake applications and some heat before a pad sticks so on your test drive do some hard braking in the first few miles and then avoid all hard braking until you get back. Once back put your hand on each road wheel and if any are excessively hot that points to a sticking calliper on that wheel. Note that your front wheels may be warm (any braking produces lots of heat) but not too hot to keep your hand on and your rear wheels should be almost cold.
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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)
Why isn't my daughter an Alfaholic? | |
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