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[viper]

Hi all,

I have a 2000 3.0 V6.

The car has no power when trying to pull off the drive. As if you had a manual choke and forgot to pull it out. This happens when the engine is cold and when its up to temp and you try to re-start the car. Sometimes you can pull away but at a junction you will pull out and the car will loose all power and eventually stall leaving you in a very dangerous position in the road

There were no fault codes 73 or 74 at this time.

After much testing of various things, I found that when I disconnected the MAF and started the car many times to re-set things, the fault did not appear. Car idled fine. No loss of power.

Must be a faulty MAF I thought!

Bought a brand new Bosch MAF. Fitted it and re-started car many times to re-set things and car ran fine once or twice then fault re-appeared. The car stalls when trying to idle and has no power at all so you can't move the car.

Paperclip test reveals Fault Codes 73 & 74.

Again, disconnect MAF and it runs fine.

The connector is in good condition to the MAF with no damage to the loom.

The Air filter is brand new - remember car runs fine with MAF disconnected - so I am at a loss

Any help - please

[chrisgixer]

Any corrosion on the loom plug pins to ecu...?

[steve6367]

Are you certain the new MAF is ok? Sometimes on eBay etc you do get ones claiming to be Bosch etc that are not really.....

[viper]

The pins in the connector are fine.

The part was purchased at a reputable Trade Supplier. It is not a fake part off the internet.

It cost £185 !!

 

[05omegav6]

Kinell, how much could have bought a genuine gm one for less

Doesn't mean it's not a dud though... you can prove it isn't working so take it back...

[chrisgixer]

Christ almighty, take it back regardless.

The pre face lift maf's are very reliable. While its not impossible that its failed, the fact you have two quite reliable parts giving a code does suggest it's not the maf itself.

Is it possible to bell out the pins to ecu with a meter for continuity? Wiggling wires as you go?

[viper]

The same part at Vauxhall was - wait for it - £265 + VAT !!! And it is exactly the same Bosch part!

It would be incredible if the new MAF was to blame?

Help!!!

[steve6367]

I think I would take it back, explain it is not working and pickup one from your nearest VX dealer. If its the same kind of cost as 2.2 should be about £80 +vat on TC 

Edit - clearly the MAF for that engine is a lot more then!

[viper]

The previous Bosch unit I suspected was faulty did not give any fault codes. There was no EML either.

Disconnecting and re-connecting the new one has left 73 & 74 in the car's memory me thinks?

I could not find a Bosch MAF cheaper - so I really don't want to p**s off the supplier as everyone else wanted considerably more. Cheapest was 175+VAT !

I did try a Cambier from a different supplier but that saw the car stalling upon acceleration and reduced the car's acceleration considerably.

I might check what its giving out by sticking pins in the connector's wiring when its running (trying to run) for both units against a volt meter.

[chrisgixer]

Can you get a code reader with live data on it? ...might even be in tech 2 territory.

Where are you in the world?

[viper]

Sunderland

[chrisgixer]

Ah... Nearest tech 2 on here would be Dtm in Nottingham.

[dbug]

Would still suspect new maf if it runs ok if its disconnected

[terry paget]

What you want is someone nearby with a healthy 3.0 V6 Omega, so that you can swap MAF sensors - they are esy to fit.

[Andy H]

Unplugging the MAF will make the ecu run in limp home mode and use default settings for all sorts of things,  not onlyair flow. Just because it runs better without the MAF connected doesn't confirm that there is anything wrong with the MAF.
It is quite likely that one or more other things are wrong but not bad enough to bring up a useful fault code.
Check for intermittent electrical faults (fuel pump relay?) then get a reader that can read live values & check/reset long term trims.
When did you last change the fuel filter?