Grrrrrrr. Lambda Sensors - Page 4

JamesV70R · Jan 26th, 2011, 15:31

Yeh, Unplugging the MAF caused caused my ETS light to come on, but the car ran alright .. getting some Electrical Contact cleaner (MAF Safe stuff) to give it a blast out. If it makes a difference it will be worth the £6, and I can then budget for a new MAF.

The MAF not responding quick enough would explain the 02 Sensor error of "Insufficient Switching" - if it thinks its going slower than the MAF when the MAF is at fault I can see how it would get confused.

Chris_Rogers · Jan 26th, 2011, 16:14

P1171 = Fuel trim code.

Did you try unplugging the rear O2 sensor?

JamesV70R · Jan 26th, 2011, 21:17

Cleaned MAF, unplugged battery for 45 mins, reconnected and started engine - light was off.

Idling a lot smoother than she was. No snoke or smells, not that I could see/smell anyway. Quick 5 mine round trip, most at 30mph quick sprint to 60 when the limit allowed, seems a lot more healthy!

Will know for sure over the next few days after a few trips - just hope this has cured it!

Next port of call if it goes downhill again is rear 02 sensor ...

dpbayly · Jan 26th, 2011, 21:29

Glad to hear its improved, lets hope it stays that way

gdphillips · Jan 26th, 2011, 22:03

oh well done mate dont get put off by it ......keep going and solve the prob...well done so far tho...

JamesV70R · Feb 2nd, 2011, 15:35

New MAF arrived today - Unplugged battery, installed new MAF, reconnected battery, and started the car up. Idle was alright if a little sluggish. Within 1/2 a mile (before the end of my road even!) car was starting to struggle a little.

By the time I got back to work (2 miles) revs on idle were down around the 300 mark, on the overrun into a roundabout the engine died (no power steering and no brakes AT 30mph just before the turn into a roundabout = "oh cr*p" moment. Started alright, idle was right down still.

Drove the next 1/2 mile keeping a small amount of throttle on to keep revs up at 1200 or so, generally trying to keep the car rolling.

Old MAF is going back in when I get home tonight, replacement is going back. Going to get jack and stands out tonight and try and get rear 02 sensor out of the car for a quick examination.

Urg. What next!

Oh and no Engine Managment light on yet.

deathrider311271 · Feb 2nd, 2011, 17:35

you did fit a genuine bosch MAF didnt you? and a genuine bosch lambda sensor?

i fitted a NGK lambda and the car didnt like it, put bosch one in all was fine.

JamesV70R · Feb 2nd, 2011, 17:42

Left work, sat in the carpark with the engine running for about 10 mins, running a little bit sick, touch of a misfire now and then but much better than earlier.

No codes, so sat for a few mins and everything sslowly got better.

On the drive home economy got better, a few "spirited" takeoffs at roundabouts had a small chirp from the tyres, so power is coming back.

Fingers crossed it was just the ECU learning the resistance of the new MAF, compared to the 10+ y/old one that was in there.

deathrider311271 · Feb 2nd, 2011, 18:06

fingers crossed sorted then mate

RWD · Feb 2nd, 2011, 20:12

Quote:

Originally Posted by Villan

Left work, sat in the carpark with the engine running for about 10 mins, running a little bit sick, touch of a misfire now and then but much better than earlier.

No codes, so sat for a few mins and everything sslowly got better.

On the drive home economy got better, a few "spirited" takeoffs at roundabouts had a small chirp from the tyres, so power is coming back.

Fingers crossed it was just the ECU learning the resistance of the new MAF, compared to the 10+ y/old one that was in there.

If my memory serves me correctly, when we replaced the MAF sensor when I worked at Volvo the techies would leave the car stood for 15 to 20 mins with the ignition on, apparently this was to let the ECU 'learn' the new unit. They would then start the car and run for 10 mins at idle, then turn it off.

Will ask my contact at Volvo next time I speak to him.

Jan 26th, 2011, 21:17	#33
JamesV70R Forum Support Team Last Online: Yesterday 23:48 Join Date: Aug 2009 Location: Watford	Cleaned MAF, unplugged battery for 45 mins, reconnected and started engine - light was off. Idling a lot smoother than she was. No snoke or smells, not that I could see/smell anyway. Quick 5 mine round trip, most at 30mph quick sprint to 60 when the limit allowed, seems a lot more healthy! Will know for sure over the next few days after a few trips - just hope this has cured it! Next port of call if it goes downhill again is rear 02 sensor ... Last edited by JamesV70R; Jan 26th, 2011 at 21:44.

Jan 26th, 2011, 22:03	#35
gdphillips ba baracus... Last Online: May 30th, 2023 12:30 Join Date: Dec 2008 Location: chichester west sussex	oh well done mate dont get put off by it ......keep going and solve the prob...well done so far tho... __________________ i aint getting on no plane.............

Feb 2nd, 2011, 15:35	#36
JamesV70R Forum Support Team Last Online: Yesterday 23:48 Join Date: Aug 2009 Location: Watford	New MAF arrived today - Unplugged battery, installed new MAF, reconnected battery, and started the car up. Idle was alright if a little sluggish. Within 1/2 a mile (before the end of my road even!) car was starting to struggle a little. By the time I got back to work (2 miles) revs on idle were down around the 300 mark, on the overrun into a roundabout the engine died (no power steering and no brakes AT 30mph just before the turn into a roundabout = "oh crp" moment. Started alright, idle was right down still. Drove the next 1/2 mile keeping a small amount of throttle on to keep revs up at 1200 or so, generally trying to keep the car rolling. Old MAF is going back in when I get home tonight, replacement is going back. Going to get jack and stands out tonight and try and get rear 02 sensor out of the car for a quick examination. Urg. What next! Oh and no Engine Managment light on yet. Last edited by JamesV70R; Feb 2nd, 2011 at 15:42.*

Jan 26th, 2011, 15:31	#31
JamesV70R Forum Support Team Last Online: Yesterday 23:48 Join Date: Aug 2009 Location: Watford	Yeh, Unplugging the MAF caused caused my ETS light to come on, but the car ran alright .. getting some Electrical Contact cleaner (MAF Safe stuff) to give it a blast out. If it makes a difference it will be worth the £6, and I can then budget for a new MAF. The MAF not responding quick enough would explain the 02 Sensor error of "Insufficient Switching" - if it thinks its going slower than the MAF when the MAF is at fault I can see how it would get confused.

Jan 26th, 2011, 16:14	#32
Chris_Rogers VOC Member Last Online: Apr 10th, 2017 16:55 Join Date: Jan 1970 Location: South Kent Coast	P1171 = Fuel trim code. Did you try unplugging the rear O2 sensor?

Jan 26th, 2011, 21:29	#34
dpbayly Member Last Online: Apr 7th, 2020 19:35 Join Date: Dec 2010 Location: royston	Glad to hear its improved, lets hope it stays that way

Feb 2nd, 2011, 17:35	#37
deathrider311271 I've Been Banned Last Online: Jun 21st, 2022 19:26 Join Date: Mar 2010 Location: Grimsby	you did fit a genuine bosch MAF didnt you? and a genuine bosch lambda sensor? i fitted a NGK lambda and the car didnt like it, put bosch one in all was fine.

Feb 2nd, 2011, 17:42	#38
JamesV70R Forum Support Team Last Online: Yesterday 23:48 Join Date: Aug 2009 Location: Watford	Left work, sat in the carpark with the engine running for about 10 mins, running a little bit sick, touch of a misfire now and then but much better than earlier. No codes, so sat for a few mins and everything sslowly got better. On the drive home economy got better, a few "spirited" takeoffs at roundabouts had a small chirp from the tyres, so power is coming back. Fingers crossed it was just the ECU learning the resistance of the new MAF, compared to the 10+ y/old one that was in there.

Feb 2nd, 2011, 18:06	#39
deathrider311271 I've Been Banned Last Online: Jun 21st, 2022 19:26 Join Date: Mar 2010 Location: Grimsby	fingers crossed sorted then mate

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