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Author Topic: engine management - the lights back on ?  (Read 6726 times)

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Entwood

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Re: engine management - the lights back on ?
« Reply #45 on: 13 November 2011, 16:34:56 »
Misfires probably just the fuel trims being reset, the GS500 had them as "pending" codes so not even active at the time of reading. If you remember the missing occured on the reset and fanished as soon as the engine was restarted. Unless, and until, any misfire re-occurs I would not be concerned at all.

Any problems with either the car or the reader just yell

:)
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bigpaul

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Re: engine management - the lights back on ?
« Reply #46 on: 15 November 2011, 17:56:18 »
spot on your a sound guy really appreciate all your help and advice :)

Would like to hear more about NOT using supermarkets to fill up can someone clarify the reasons whys and wherefores
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albitz

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Re: engine management - the lights back on ?
« Reply #47 on: 15 November 2011, 18:00:10 »
Its a matter of opinion.Some people say their car runs better on expensive fuel.Others say it runs the same on any fuel. When I tried the expensive stuff there was no difference that I could tell. ;)
Afaik,the scientific/engineering view is that it will only really make a difference on very high performance engines.
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Impact Pete

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Re: engine management - the lights back on ?
« Reply #48 on: 15 November 2011, 18:04:55 »
Quote from: kcl on 08 November 2011, 18:51:11
A new MAF has cured several P0170/P0173 problems  :y :y

Yep that immediately sorted mine with exact codes
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Kevin Wood

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Re: engine management - the lights back on ?
« Reply #49 on: 15 November 2011, 18:23:12 »
The fact that both the short term fuel trims are high and increase with RPM, and the fact that it runs grumpy when you reset the fuel trims points to a lazy MAF sensor, IMHO.

This can make the Lambda sensors appear "lazy", of course. If the mixture is far enough out a good lambda sensor will stop toggling too. ;)
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bigpaul

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Re: engine management - the lights back on ?
« Reply #50 on: 19 November 2011, 07:55:25 »
can you give me some more information on the MAF and how i would go about replacing it

Is it an expensive job ?

My technical know how as Im sure entwood can verify is extremely limited  :(

so i guess i would have to call someone in

As a foot note the light came on again Thursday armed with my decoder and laptop thankyou thankyou thankyou entwood  :)
i checked it out this time only the one code 0170 which i then reset.

first thing Friday morning she had a gumble when i started her slight mis-fire ? and since then all running fine
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Entwood

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Re: engine management - the lights back on ?
« Reply #51 on: 19 November 2011, 10:15:07 »
Not had to do this (yet) but MAF replacement looks a fairly simple procedure ..according to the "book of lies"

Quote
Airflow meter
39 Ensure the ignition is switched off then
disconnect the wiring connector from the
airflow meter and intake air temperature
sensor (see illustration).
40 Slacken the retaining clips then detach the
intake duct from the airflow meter and air
cleaner housing and remove it from the vehicle.
41 Slacken the retaining clip then remove the
airflow meter from the vehicle (see
illustration). Inspect the meter for signs of
damage and renew if necessary.
42 Refitting is the reverse of removal
ensuring the intake ducts are correctly
engaged with the meter recesses.

Certainly no need for it to go into a garage, easily do-able at the roadside :)

Just a matter of getting hold of a known good one.. I expect new are stupid prices ... so maybe a breaker here ??

More that willing to help you change it, once you get hold of one !! I'm sure further advice will follow from "someone who knows"

:)
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Ken T

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Re: engine management - the lights back on ?
« Reply #52 on: 19 November 2011, 20:07:42 »
Some mentioned this company are good, http://www.ebay.co.uk/itm/Air-Flow-Mass-meter-Vauxhall-Astra-Omega-0280-217-106-/370086090183?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item562ad995c7 I don't know if this is the correct MAF for the car, but looks not too expensive. However it may not be as good as a genuine one, any thoughts ?.

Ken
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Entwood

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Re: engine management - the lights back on ?
« Reply #53 on: 19 November 2011, 20:56:54 »
Unfortunately I don't think thats the right one ... OP's is a 2.6 which is not listed by that site, and according to my reading of the EPC (which could well be wrong !!) he needs

METER, ASSY., AIRFLOW, AIR CLEANER (BOSCH 0281002184) (NLS.- USE 93171760 8 36 593 )

and they are frightening prices although there is ONE seller at something reasonable .. question is .. why is that one so cheap .... :(

http://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=p3984.m570.l1313&_nkw=93171760&_sacat=See-All-Categories

:(

EDIT ...

Interesting .. put the original Bosch code in to ebay and you get this ..

http://www.ebay.co.uk/sch/i.html?_nkw=0281002184&_sacat=0&_dmpt=UK_CarsParts_Vehicles_CarParts_SM&_odkw=93171760&_osacat=0&_trksid=p3286.c0.m270.l1313

Which has several at a reasonable price ......
« Last Edit: 19 November 2011, 21:00:10 by Entwood »
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bigpaul

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Re: engine management - the lights back on ?
« Reply #54 on: 20 November 2011, 07:56:08 »
i find this quite worrying :(

there seem to be so many variables with with such differing prices £120+ is well above my comfort zone finantially at the moment :-[

maybe will have to try and scope out either a non Bosch or a second hand one
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Re: engine management - the lights back on ?
« Reply #55 on: 20 November 2011, 08:06:28 »
Quote from: Impact Pete on 15 November 2011, 18:04:55
Quote from: kcl on 08 November 2011, 18:51:11
A new MAF has cured several P0170/P0173 problems  :y :y

Yep that immediately sorted mine with exact codes

Sorted mine as well ... i know mine is only 2.2 but new maf stopped my P0170
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Andy H

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Re: engine management - the lights back on ?
« Reply #56 on: 23 November 2011, 20:05:14 »
There was a thread on here about some transits using the same MAF http://www.omegaowners.com/forum/YaBB.pl?num=1259170901/6

If I could work out how to post a link to the thread in the new site I would.............
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Kevin Wood

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Re: engine management - the lights back on ?
« Reply #57 on: 24 November 2011, 09:58:00 »
Note 2.6 and 3.2 use the same MAF.

What are the units for the MAF figure in the live data? Voltage or mass air flow?

Typically, MAF should be about 12 kg/h at hot idle, and increase dramatically with more throttle. I can't make sense of the figures posted.

Swapping it with the known good one from my car is my favourite diagnostic step. If it then no longer stumbles when the trims are reset, and fuel trims stay senssible - faulty MAF.
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Entwood

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Re: engine management - the lights back on ?
« Reply #58 on: 24 November 2011, 10:39:12 »
Quote from: Kevin Wood on 24 November 2011, 09:58:00
Note 2.6 and 3.2 use the same MAF.

What are the units for the MAF figure in the live data? Voltage or mass air flow?

Typically, MAF should be about 12 kg/h at hot idle, and increase dramatically with more throttle. I can't make sense of the figures posted.

Swapping it with the known good one from my car is my favourite diagnostic step. If it then no longer stumbles when the trims are reset, and fuel trims stay senssible - faulty MAF.

Just been out and chcked .. it is g/s   grams / second.

My 3.2 on starting from cold and still running on petrol - you have to have the engine running to get live data to work ! - shows 8.2 g/s but idle is still quite high as very cold .... :)

HTH
« Last Edit: 24 November 2011, 10:40:47 by Entwood »
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Kevin Wood

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Re: engine management - the lights back on ?
« Reply #59 on: 24 November 2011, 10:46:58 »
Quote from: Entwood on 24 November 2011, 10:39:12
Quote from: Kevin Wood on 24 November 2011, 09:58:00
Note 2.6 and 3.2 use the same MAF.

What are the units for the MAF figure in the live data? Voltage or mass air flow?

Typically, MAF should be about 12 kg/h at hot idle, and increase dramatically with more throttle. I can't make sense of the figures posted.

Swapping it with the known good one from my car is my favourite diagnostic step. If it then no longer stumbles when the trims are reset, and fuel trims stay senssible - faulty MAF.

Just been out and chcked .. it is g/s   grams / second.

My 3.2 on starting from cold and still running on petrol - you have to have the engine running to get live data to work ! - shows 8.2 g/s but idle is still quite high as very cold .... :)

HTH

Ok. So, multiply by 3.6 and you should have kg/h. That makes yours 29.5kg/h which is reasonable for a cold engine, I reckon.

The live data you posted at a hot idle - 2.25-2.5 g/s is only about 8 or 9 kg/h which is a little low, IMHO.
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