03-02-2014, 01:02 PM
Dave, I agree with you on most of your points, except that MAFs usually work; I would say 50% of the cars that come to me have a MAF problem. If you know what the default MAF table values are it's quite easy to spot, they are also different on a 306 or 206, so a 306 would be down on power and a 206 you wouldn't notice it.
I'm going to try and calibrate one of these in to Ian's car with the k03s hybrid http://www.ebay.co.uk/itm/Citroen-C5-2-0...2a34447df0
Think I will buy a new VDO unit so that we know it's not got a problem with it, the cheap units tend to cause problems, I think it's mainly because they read the wrong air flow, if EGR is still connected then the EGR will open to reduce air flow and make the car chug etc etc.
Bottom line of it, only get rid of the MAF if you're above a stage 2 and that's if it's giving you massive problems.
I've got a strange feeling MAF readings are affected by fitting a cone filter, the air doesn't flow in a laminar manner as it goes through the sensor and I don't think it reads properly. I'm going to fit a 90 silicone hose between the cone and MAF on my brothers car to see if it changes low down response (don't shoot us for having a cone filter in there, it's so that we can fit other parts into the tight engine bay! haha).
JP, you asked us to get some conversation going on the matter, so hope you found this interesting?
I'm going to try and calibrate one of these in to Ian's car with the k03s hybrid http://www.ebay.co.uk/itm/Citroen-C5-2-0...2a34447df0
Think I will buy a new VDO unit so that we know it's not got a problem with it, the cheap units tend to cause problems, I think it's mainly because they read the wrong air flow, if EGR is still connected then the EGR will open to reduce air flow and make the car chug etc etc.
Bottom line of it, only get rid of the MAF if you're above a stage 2 and that's if it's giving you massive problems.
I've got a strange feeling MAF readings are affected by fitting a cone filter, the air doesn't flow in a laminar manner as it goes through the sensor and I don't think it reads properly. I'm going to fit a 90 silicone hose between the cone and MAF on my brothers car to see if it changes low down response (don't shoot us for having a cone filter in there, it's so that we can fit other parts into the tight engine bay! haha).
JP, you asked us to get some conversation going on the matter, so hope you found this interesting?