02 Zafira down in power

new2me

Got 2002 2.0 litre dti zafira thats low on power, no warning lights on dash

Zcott

Change up into second gear.

jimgoose

Diesel of petrol? If petrol you should be able to pull some DTC fault codes.

shamwari

The DTi has a couple of candidates for causing a down on power engine WITHOUT a MIL on. If its smokey, an EGR valve stuck open or leaky intake trunking are likely.

If there's no smoke, the MAF is a likely cause - especially if it's a Bosch. Disconnect it and see if the car improves.

If you don't know the car's history, change the fuel filter. They can clog if neglected.

Failing all of this, I'd be looking at a code scan and live data read, even if the MIL is not on. Although to be fair, these things have a habit of putting the MIL on at the drop of a hat.

new2me

Zcott wrote: »

Change up into second gear.

now thats not very helpful

new2me

shamwari wrote: »

The DTi has a couple of candidates for causing a down on power engine WITHOUT a MIL on. If its smokey, an EGR valve stuck open or leaky intake trunking are likely.

If there's no smoke, the MAF is a likely cause - especially if it's a Bosch. Disconnect it and see if the car improves.

If you don't know the car's history, change the fuel filter. They can clog if neglected.

Failing all of this, I'd be looking at a code scan and live data read, even if the MIL is not on. Although to be fair, these things have a habit of putting the MIL on at the drop of a hat.

Was thinking it could be a MAF myself, will try that tomorrow and see how it goes...cheers

shamwari

new2me wrote: »

Was thinking it could be a MAF myself, will try that tomorrow and see how it goes...cheers

Bosch MAF's aren't great, cheap Chinese replacements on eBay are woeful and to be avoided. Pierburg MAF's are best of the lot.

new2me

these can be cleaned i believe