D
Derckchair
Guest
Made an amazing discovery which has made my 1.2 engine a sheer delight compared to the hesitant little devil it was below 2K revs.
Talking standard Bravo air filter (It may be the same on other Bravo engine variants too. About 12"x6"x2"depth rectangular box filter). For 60k miles my 1.2 engine has had nuisance hesitation on acceleration, sometimes knocking your head off, sometimes not so bad but always there, every time, smack on 1500-2000rpm. Never anywhere else. Makes your neck ache sometimes. Not plugs, plug leads or fuel. All changed to no avail.
Changed air filter, noticably better but hesitation still there. 1700rpm.. . jolt! Worse under certain weather conditions like dry days or very wet days. No problems ever throughout the rest of the rev range. Had to be tuning! On older cars would have gone for the air/fuel mixture but can't do anything with modern cars.
When I took out the old air filter I noticed it had a black foam sheet stuck over the inlet to the air filter. It's glued on so it's meant to be there. Trouble is you can't see if the foam is clogged as you can't see anything in black foam. The yellow air filter is as clean as a whistle!
Anyway, when dust blown out of black foam car again is better and has less of a flat spot but still there.
Thinks! Maybe the foam is not meant to be on the filter? Never seen sheet of foam on an air filter before and how are you supposed to check if the air filter is dirty in black foam?
Decided to experiment and pulled off the foam today. It's only glued in a few places.
WOW! What a difference! NO flat spots! Car pulls right down to 1200rpm with no hesitation and feels likes it wants to go all the time! Like a different car!
Jesus! I'm still doing trials and it will be interesting to see how mpg is affected but mpg has got to be better now the engine can breath properly.
The foam must be clogging really early with dust (this one had only done 5K miles) and the air filter itself is not even getting the air in to do its filtering. That's why it's worse in dry conditions. Then when it's wet the water droplets are probably clogging the foam again!
So at the moment I'd say if you've got a 1.2, especially if it suffering hesitation, then whip out the air filter and pull off the black foam.
Talking standard Bravo air filter (It may be the same on other Bravo engine variants too. About 12"x6"x2"depth rectangular box filter). For 60k miles my 1.2 engine has had nuisance hesitation on acceleration, sometimes knocking your head off, sometimes not so bad but always there, every time, smack on 1500-2000rpm. Never anywhere else. Makes your neck ache sometimes. Not plugs, plug leads or fuel. All changed to no avail.
Changed air filter, noticably better but hesitation still there. 1700rpm.. . jolt! Worse under certain weather conditions like dry days or very wet days. No problems ever throughout the rest of the rev range. Had to be tuning! On older cars would have gone for the air/fuel mixture but can't do anything with modern cars.
When I took out the old air filter I noticed it had a black foam sheet stuck over the inlet to the air filter. It's glued on so it's meant to be there. Trouble is you can't see if the foam is clogged as you can't see anything in black foam. The yellow air filter is as clean as a whistle!
Anyway, when dust blown out of black foam car again is better and has less of a flat spot but still there.
Thinks! Maybe the foam is not meant to be on the filter? Never seen sheet of foam on an air filter before and how are you supposed to check if the air filter is dirty in black foam?
Decided to experiment and pulled off the foam today. It's only glued in a few places.
WOW! What a difference! NO flat spots! Car pulls right down to 1200rpm with no hesitation and feels likes it wants to go all the time! Like a different car!
Jesus! I'm still doing trials and it will be interesting to see how mpg is affected but mpg has got to be better now the engine can breath properly.
The foam must be clogging really early with dust (this one had only done 5K miles) and the air filter itself is not even getting the air in to do its filtering. That's why it's worse in dry conditions. Then when it's wet the water droplets are probably clogging the foam again!
So at the moment I'd say if you've got a 1.2, especially if it suffering hesitation, then whip out the air filter and pull off the black foam.