Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length

[Andy H]

Intermittent faults can often be caused by frayed wiring. When you close the throttle the engine will move on the engine mounts. If there is any damage in the cable to the MAF it could choose that moment to lose contact (and give a zero flow reading).

I think I would be using live readings to try and find if flexing the cables in front of the engine could recreate the fault (take care not to catch a sleeve in the auxiliary belt. better to poke it with a stick rather than put your arm in...........)

Also worth checking that the big round multiplug next to the battery is securely plugged together.

[PhilRich]

Reading through previouse owners history tonight it seems the MAF was changed in 03-2011 for a "airflow meter vauxhall 1.6/1.8 £24.99" from "Fiesta-centre (Auto-Sensors).

So I imagine not GM.....

Is this even the correct MAF for your car? It may well be a physical fit & the plug may even be the same, but the working parameters of the sensor may be totally wrong for your 2.2

[steve6367]

Andy - thanks - I will give this a go tomorrow. I have also found another 2.2 whose owner is willing to let me plug in so I can get some MAF readings from a known working 2.2.

Phil - that is exactly what I wondered, but when I visited Vauxhall today I decided £180 was too much to spend on a genuine one until I am sure!

Are any aftermarket ok?

Thanks for all the comments.

Steve

[Andy H]

Might be worth putting your postcode into the bosch dealer locator http://www.boschautoparts.co.uk/bdl/loc_search.asp?strLocator=Product and phoning round for a price direct from a Bosch agent.

IIRC some items (eg plug leads) are far cheaper direct from a Bosch franchise than they are from VX (but that might be wishful thinking......)

[dbug]

Get a working used one from one of the breakers on here

[steve6367]

Ok so - I have the data from a working  2.2.

MAF at idle - 3.8 g/s

against mine at 7.04 g/s

Full data, including other engine speeds linked below. I will now try and put the "good" data into a guide for others reference.

It does look like my MAF is reading high however.

https://www.dropbox.com/s/klor1mww8doqmvz/TC%202.2%20Salon.csv

https://www.dropbox.com/s/hs7fpdklerwa6rx/My%202.2%20Estate.csv

[Marks DTM Calib]

So its reading about 13.6 Kg/h on the replacement which is about right for a 4 pot on idle

[steve6367]

Mark - I didn't fit the MAF to my car the reading were from a 2.2 Salon that is working without faults. I wanted to see if my MAF reading was correct but it seems off. I would have swapped it over, but the owner of the salon was not convinced!

Have now posted a wanted advert to see if any breakers on here has a VX MAF.

Steve

[Marks DTM Calib]

Mark - I didn't fit the MAF to my car the reading were from a 2.2 Salon that is working without faults. I wanted to see if my MAF reading was correct but it seems off. I would have swapped it over, but the owner of the salon was not convinced!

Have now posted a wanted advert to see if any breakers on here has a VX MAF.

Steve

So your MAF is reading double what it should be!

Kin ell!

[Marks DTM Calib]

Reading through previouse owners history tonight it seems the MAF was changed in 03-2011 for a "airflow meter vauxhall 1.6/1.8 £24.99" from "Fiesta-centre (Auto-Sensors).

So I imagine not GM.....

Thats just brilliant!

It is a common part and was used on the 1.8 and 2.0 16V big blcok units as well (e.g. Astra, Vectra, Corsa etc....no surprise as its a stroked 2.0 which is the same block and design as the 1.8 ).

Engine types X18XE1, Z18XE, Z18XEL, X20XER

Certainly not used on the small block engines (e.g. 1.6 and lower plus the later 1.8's ) which are a TOTALY different injection system

[steve6367]

Mark - so based on that it not faulty, its just designed for a different engine!

[Marks DTM Calib]

Mark - so based on that it not faulty, its just designed for a different engine!

Absolutely, the poor thing is likely to be designed for a max airflow which may well be half that of the 2.2 sensor and hence the high reading at idle.

Its amazing its the same bore and fits in the trunking!

[Andy H]

Mark - so based on that it not faulty, its just designed for a different engine!

Absolutely, the poor thing is likely to be designed for a max airflow which may well be half that of the 2.2 sensor and hence the high reading at idle.

Its amazing its the same bore and fits in the trunking!

I thought Steve wrote that the bore looked dirty & original & only the electronic sensor looked shiny 

My suspicion is that a wiring fault prompted someone to fit a new (incorrect) sensor.
-First task is to get the correct sensor fitted.
-Second task is to fix the original fault

[steve6367]

Ok, the plot thickens!

My seimens genuine MAF arrived and I fitted it, checked live data and MAF readings much closer to the known good 2.2 I tested. Went for a drive and bliss 1, 2, 3 and lockup all at sensible revs no holding 2nd at 40mph plus. Great I think, but when I pull up and stop idle is very rough and it almost stalls. Switch off,  good look around, check connections etc no change - new plugs and swap coil pack for known good one and still no change. If I unplug MAF revs rise and its a little less rough but not correct. Fine if you keep moving, but if you have to stop and pull away it not good! No lights on dash and no codes logged (other than me unplugging MAF).

Any thoughts? I am not quite sure what to do now other than out the old MAF back and return to holding gears! :-(

Many thanks

Steve

[Andy H]

As I wrote above
First task is to get the correct sensor fitted 
Second task is to fix the original fault 

Stick with it (the new sensor)
Are you able to reset the long term trims?
What are the live readings saying when the idle goes lumpy?