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 Posted: Tue Feb 17, 2015 10:41 am |
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Joined: Jan 25, 2010
Posts: 3497
Trade Rating: +31
Location: VVT Land, Fife
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Hi all it's been a while,
I have recently acquired a 54 plate 206 GTi 138. It was originally showing an anti pollution fault when cold and stayed on all day. I have since replaced the llambda sensors, coil pack, spark plugs, air filter, coolant temperature sensor, timimg belt and water pump. MAP sensors was cleaned and reading fine. Air temp sensor is all reading fine. New download to ECU has been done too...All related to this fault.
There is a permanent fault code is showing as P0170: Mixture regulation. This points towards an over-fuelling issue. Another intermitent code shows as: P0131 Upstream Oxygen sensor open or short circuit and all wiring has been checked.
Any ideas?
Thanks in advance...tearing my hair out here.
Cheers,
Brian
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Posted: Tue Feb 17, 2015 11:28 am |
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Joined: Feb 24, 2010
Posts: 2596
Trade Rating: +17
Location: North West Wales
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Has the cat been removed?
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Posted: Tue Feb 17, 2015 3:17 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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+1 for CAT removal or defective CAT.
What did plug colours suggest? Though on modern cars the emissions are so tight it can throw a light without plug colours being much help but it is worth looking. They may help identify if it is a single cylinder problem or across all plugs.
Might also be worth buying a cheap infra red temp sensor. A cooler manifold on any one cylinder will again help identify if it is a single cylinder problem or across all.
It might also be worth getting a garage to do an exhaust gas reading. That will help.
And finally, my favourite, is exhaust leak before lambda even a very small one. Some air gets in as well as exhaust getting out. Lambda sees the oxygen in the air, signal says car is running lean and ECU richens the mixture. This gets beyond capability of CAT to correct and post CAT lambda throws a code. The excess fuel also eventually destroys the CAT.
Leaking injector?
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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 Feb 17, 2015 3:20 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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Lambda open circuit. That us a lot of wiring between lambda and ECU to be 100% certain it isn't The wiring. Are you 100%?
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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 Feb 18, 2015 11:08 am |
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Joined: Jan 25, 2010
Posts: 3497
Trade Rating: +31
Location: VVT Land, Fife
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Thanks a lot for your help guys, i will check the cat and wiring!
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Posted: Wed Feb 18, 2015 12:03 pm |
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Joined: Aug 04, 2011
Posts: 1343
Trade Rating: 0
Location: Swindon
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Check exhaust for leaks. One person with a rag over the end and a second crawling under the car and under the bonnet.
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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 Feb 18, 2015 3:53 pm |
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Joined: Feb 07, 2010
Posts: 7093
Trade Rating: +11
Location: Suffolk
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Upstream wouldnt be affected by a decat, the mixture may well be bought on by the lambda fault.
Check wiring, if okay, check the engine timing and compression
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| Team Impossible Possible
The only way of finding the limits of the possible is by going beyond them into the impossible - Arthur C. Clarke
Forged 1.6 Turbo
Click to see more
144Bhp @ 7PSi - 193.9Bhp @ 13psi
206 Gti Race Car
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For all Race/Track Preparation, Feel Free to PM Me!
Whether its for a custom ratio gearbox or track-day alignment, I can help! | |
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Posted: Wed Feb 18, 2015 10:20 pm |
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Joined: Apr 01, 2014
Posts: 668
Trade Rating: 0
Location: Cornwall
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States fuel trim if mix is wrong on Diagnostics.
Cat has probably gone .
Reset the eml light & see if it comes back on after a 20mile trip before you do anymore.
If so then cat .
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| If it aint broke dont fix it ! | |
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Posted: Thu Feb 19, 2015 4:00 am |
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Joined: Feb 07, 2010
Posts: 7093
Trade Rating: +11
Location: Suffolk
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| Project2062014 wrote: |
States fuel trim if mix is wrong on Diagnostics.
Cat has probably gone .
Reset the eml light & see if it comes back on after a 20mile trip before you do anymore.
If so then cat . |
Upstream is before the cat and does not monitor the cats efficeny at all. So how does this indicate to you its a failing cat?
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| Team Impossible Possible
The only way of finding the limits of the possible is by going beyond them into the impossible - Arthur C. Clarke
Forged 1.6 Turbo
Click to see more
144Bhp @ 7PSi - 193.9Bhp @ 13psi
206 Gti Race Car
Click to see more
For all Race/Track Preparation, Feel Free to PM Me!
Whether its for a custom ratio gearbox or track-day alignment, I can help! | |
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Posted: Thu Feb 19, 2015 6:01 am |
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Joined: Apr 01, 2014
Posts: 668
Trade Rating: 0
Location: Cornwall
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| Addaz wrote: |
| Project2062014 wrote: |
States fuel trim if mix is wrong on Diagnostics.
Cat has probably gone .
Reset the eml light & see if it comes back on after a 20mile trip before you do anymore.
If so then cat . |
Upstream is before the cat and does not monitor the cats efficeny at all. So how does this indicate to you its a failing cat? |
Missed the upstream . PRE CAT lambra . Must be a connection thats dogey ?. Seems strange . Try checking fuel injectors i bet there is a dogey one . a injector fault ? Not fueling correctly ..
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| If it aint broke dont fix it ! | |
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