306 feels slow.

[tysonbully2k12]

So i have had my hdi for nearly a year.
Lately its been feeling slow compared to when i got it.

Its got bad tapping injectors, on 170k
Would they make it loose power?

I also noticed one day my boost gauge pipe came off, and i got a sudden amount of power.

Any ideas?

[Poodle]

Injectors could make a difference to power, but not enough that i'd expect you to feel it. More likely the maf has gone, try running with it unplugged and see if theres a difference.

Boost gauge feed also feeds the wastegate actuator, so when the pipe came off you would have been running with the wastegate held shut and over-boosting.

[tysonbully2k12]

Injectors could make a difference to power, but not enough that i'd expect you to feel it. More likely the maf has gone, try running with it unplugged and see if theres a difference.

Boost gauge feed also feeds the wastegate actuator, so when the pipe came off you would have been running with the wastegate held shut and over-boosting.

I tried unplugging maf and there was no difference.
I drilled the inlet elbow for boost gauge pipe,

[Toms306]

If theres no difference with the MAF unplugged then it's broken...

[tysonbully2k12]

If theres no difference with the MAF unplugged then it's broken...

Would it make a noticeable difference? :-)
I will have to find one and try it.

[Poodle]

Not if it's broken, no lol. You just did try it, that was the whole point of the exercise.

Basically, if the ecu isn't getting maf readings that are close to what it expects, then it resorts to a set of "safe" default values, ie low values which will make sure the car doesn't smoke, but also make it feel down on power. Unplugging the maf forces the ecu to resort to these default values, so if there's no difference between maf plugged in and maf unplugged then the maf is dead and needs replacing to restore power and economy.

Do you have one of those stupid K&N style filters? They're known for killing mafs.

[tysonbully2k12]

Not if it's broken, no lol. You just did try it, that was the whole point of the exercise.

Basically, if the ecu isn't getting maf readings that are close to what it expects, then it resorts to a set of "safe" default values, ie low values which will make sure the car doesn't smoke, but also make it feel down on power. Unplugging the maf forces the ecu to resort to these default values, so if there's no difference between maf plugged in and maf unplugged then the maf is dead and needs replacing to restore power and economy.

Do you have one of those stupid K&N style filters? They're known for killing mafs.

How much do they go for?
Nope oem filter, dont have a air filter pipe though, the one that goes to grill.

[Poodle]

Proper siemens vdo maf is about £70 new from euros, wouldnt bother with second hand unless its a known-good and low mileage one and pattern parts aren't worth the chinese newspaper they're made out of as a rule.

Did you take the cold air feed off yourself? If so that will have knocked the power back a touch once the engine is warm, wont have made a difference to the maf though.

---

Theres some people say you can sort them for a while with a spray of electrical cleaner or similar, probably worth a try before shelling out.

[tysonbully2k12]

Proper siemens vdo maf is about £70 new from euros, wouldnt bother with second hand unless its a known-good and low mileage one and pattern parts aren't worth the chinese newspaper they're made out of as a rule.

Did you take the cold air feed off yourself? If so that will have knocked the power back a touch once the engine is warm, wont have made a difference to the maf though.

---

Theres some people say you can sort them for a while with a spray of electrical cleaner or similar, probably worth a try before shelling out.

got a price of 85euro chinese and 150euro oem

yes had to take it off to fit dukes of hazzard horn :/

dont have any electrical cleaner anything else i can use?

[C.A.R.]

Haha love it, Dukes of Hazard horn. I want one.

The MAF is a dud by the sounds of it, only buy Chinese if it comes with a warranty, otherwise buy genuine. Great advice from Poodle, it's just not worth buying 2nd hand unless you don't have any money, as chances are it won't work!

[tysonbully2k12]

Haha love it, Dukes of Hazard horn. I want one.

The MAF is a dud by the sounds of it, only buy Chinese if it comes with a warranty, otherwise buy genuine. Great advice from Poodle, it's just not worth buying 2nd hand unless you don't have any money, as chances are it won't work!

i was looking for one for ages, and found one at a carboot,
there just too expensive for me to buy one, second hand one will do, heard 406 hdi one will fit?

[Poodle]

There's a part number kicking about somewhere, you should be able to find it on servicebox pretty easily. Most of the 2.0 8v hdi engines use the same maf, certainly the bosch-managed systems.

[tysonbully2k12]

There's a part number kicking about somewhere, you should be able to find it on servicebox pretty easily. Most of the 2.0 8v hdi engines use the same maf, certainly the bosch-managed systems.

think ill try the scrap yard tomorrow, try get it for a tenner,

[Toms306]

That'll be a wasted tenner if its in the same condition as your current one though...

[Eeyore]

Ive got MAFs for a few quid and they have been fine. its worth giving it a go if its only a few quid.

[tysonbully2k12]

Went to get one? Didnt have one :/ ended up buying a axle and discs for 30euro.

The axle turned out to be a recon. Happy days,

[Poodle]

Bargain! Well the money you've saved there can go on a new maf. :p Try cp4l, its euros but with discount already applied, should be a fair bit cheaper.

[tysonbully2k12]

Bargain! Well the money you've saved there can go on a new maf. :p Try cp4l, its euros but with discount already applied, should be a fair bit cheaper.

Hmmm still dont want to buy a new one ha
Scrapyard want 30euro for one of a 307, still too much, 307 should be ok if its low mileage

[Poodle]

It's your money to waste lol.

[sweeney1987]

any more axles for 30 euros?? i need one for mine..

i wouldnt bother with a second hand maf, you could end up wasting more money than price of a new one

[HDi--Power]

If you feel like a spin to Waterford ill plug you in on pp2000

[tysonbully2k12]

so i bought a MAF fitted it, and still no power,
so decided to put the airbox pipe back on, power was back until it went into limp mode,
wouldnt rev past 3000, awful ticking coming from engine,

got autocom on it and got 2 codes

[img][/img]

cleared the faults, and it started fine ran with the power back,

is that a sensor on the way out?

[Poodle]

Could be, could also be interference or another fault with the wiring.