Cold Air Intake Problems
Thread Starter
Audiworld Junior Member
Joined: Apr 2010
Posts: 49
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From: Rockville, MD
Cold Air Intake Problems
1999 A4 2.8 Quattro
Hey guys,
I have an HPS Cold Air Intake and for a while now my engine has been idling very rough and acceleration has been lagging, to say the least (stalling out by itself even). I was looking around and after some experimentation, I noticed that when I took the filter (just the filter, not the piping) off, it idles extremely smoothly and acceleration is much better, leading me to believe that the filter (even after cleaning it and re-oiling it) is starving it of oxygen. One would think that a Cold Air Intake would IMPROVE flow, but not in this case. Does anyone have any experience with this? Thanks.
Dan
Hey guys,
I have an HPS Cold Air Intake and for a while now my engine has been idling very rough and acceleration has been lagging, to say the least (stalling out by itself even). I was looking around and after some experimentation, I noticed that when I took the filter (just the filter, not the piping) off, it idles extremely smoothly and acceleration is much better, leading me to believe that the filter (even after cleaning it and re-oiling it) is starving it of oxygen. One would think that a Cold Air Intake would IMPROVE flow, but not in this case. Does anyone have any experience with this? Thanks.
Dan
AudiWorld Member
Joined: Aug 2006
Posts: 256
Likes: 0
1999 A4 2.8 Quattro
Hey guys,
I have an HPS Cold Air Intake and for a while now my engine has been idling very rough and acceleration has been lagging, to say the least (stalling out by itself even). I was looking around and after some experimentation, I noticed that when I took the filter (just the filter, not the piping) off, it idles extremely smoothly and acceleration is much better, leading me to believe that the filter (even after cleaning it and re-oiling it) is starving it of oxygen. One would think that a Cold Air Intake would IMPROVE flow, but not in this case. Does anyone have any experience with this? Thanks.
Dan
Hey guys,
I have an HPS Cold Air Intake and for a while now my engine has been idling very rough and acceleration has been lagging, to say the least (stalling out by itself even). I was looking around and after some experimentation, I noticed that when I took the filter (just the filter, not the piping) off, it idles extremely smoothly and acceleration is much better, leading me to believe that the filter (even after cleaning it and re-oiling it) is starving it of oxygen. One would think that a Cold Air Intake would IMPROVE flow, but not in this case. Does anyone have any experience with this? Thanks.
Dan
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Joined: Apr 2009
Posts: 578
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Sorry but that is complete BS. Just because the filter is oiled doesn't mean the maf is going to read the air flow different then when the filter has been removed completely. Something on the filter is causing a drop in air flow at the center of the maf.
To me it almost sounds like the filter being used has a dead spot right in front of the maf. If you are using a filter that mounts right to the MAF body or just in front of the maf you can NOT use a maf that has a inverted cone.
Dankrohn - Do you have a picture of the HPS kit?
To me it almost sounds like the filter being used has a dead spot right in front of the maf. If you are using a filter that mounts right to the MAF body or just in front of the maf you can NOT use a maf that has a inverted cone.
Dankrohn - Do you have a picture of the HPS kit?
Thread Starter
Audiworld Junior Member
Joined: Apr 2010
Posts: 49
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From: Rockville, MD
MAF
The funny thing is, it IS in fact an inverted cone, BUT it't not directly to the MAF, although its about an 18" short ram, so I'm not sure if the inverted part still has an impact. I'm tempted to try another filter, although I dont imagine that it will do much good. I've attached pics of the current HPS filter
AudiWorld Member
Joined: Aug 2006
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Sorry but that is complete BS. Just because the filter is oiled doesn't mean the maf is going to read the air flow different then when the filter has been removed completely. Something on the filter is causing a drop in air flow at the center of the maf.
To me it almost sounds like the filter being used has a dead spot right in front of the maf. If you are using a filter that mounts right to the MAF body or just in front of the maf you can NOT use a maf that has a inverted cone. .
Dankrohn - Do you have a picture of the HPS kit?
To me it almost sounds like the filter being used has a dead spot right in front of the maf. If you are using a filter that mounts right to the MAF body or just in front of the maf you can NOT use a maf that has a inverted cone. .
Dankrohn - Do you have a picture of the HPS kit?
Before you jump up and down stating the oil won't cause the MAF to die due to constrained air flow, get your argument on the same page as me. I'm not referring to the airflow. I'm referring to the contaminant (oil in the case) being sucked onto the sensor surface of the MAF. The oil doesn't make it read it wrong temporarily, it ruins the sensor
Maybe his situation is constrained airflow. But generally speaking oiled filters kill MAFs.
Dankrohn, do you have a CEL? Either way, plug into vagcom and look at MAF reading. It should read about 3 g/s at idle.
Last edited by xsrfsno225x; Dec 21, 2010 at 10:14 PM.
Thread Starter
Audiworld Junior Member
Joined: Apr 2010
Posts: 49
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From: Rockville, MD
I do have a CEL, but i had it scanned last week, at which point i found out both my rear O2's are bad AND i had misfires on 2 cylinders that come from the same coil, but nothing else came up. I can try to get to a vagcom. How would I know if the MAF is bad? Thanks again guys.
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I do have a CEL, but i had it scanned last week, at which point i found out both my rear O2's are bad AND i had misfires on 2 cylinders that come from the same coil, but nothing else came up. I can try to get to a vagcom. How would I know if the MAF is bad? Thanks again guys.
or unplug the maf and see how it runs, if the problem goes away then voila, its your maf. If the problem stays, then we can talk about other things. i also recommend fixing the issues associated with the CEL. Those codes could very well be the culprit.
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Before you jump up and down stating the oil won't cause the MAF to die due to constrained air flow, get your argument on the same page as me. I'm not referring to the airflow. I'm referring to the contaminant (oil in the case) being sucked onto the sensor surface of the MAF. The oil doesn't make it read it wrong temporarily, it ruins the sensor
Maybe his situation is constrained airflow. But generally speaking oiled filters kill MAFs.
Dankrohn, do you have a CEL? Either way, plug into vagcom and look at MAF reading. It should read about 3 g/s at idle.
Maybe his situation is constrained airflow. But generally speaking oiled filters kill MAFs.
Dankrohn, do you have a CEL? Either way, plug into vagcom and look at MAF reading. It should read about 3 g/s at idle.
I am 43 years old not 14 years old and have been been a Audi World member since 1999. lol
I have been running K&N oiled filters since I got one for my 2G Elipse back in 1995, then my A4 and both my Titans. All of them have a MAF sensor.
The only time an oiled filter is going to cause a maf to die is when the USER ends up soaking the filter with oil after they clean it. Cant exactly blame that on the filter.
Last edited by 600whpA4; Dec 22, 2010 at 03:52 PM.
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The funny thing is, it IS in fact an inverted cone, BUT it't not directly to the MAF, although its about an 18" short ram, so I'm not sure if the inverted part still has an impact. I'm tempted to try another filter, although I dont imagine that it will do much good. I've attached pics of the current HPS filter
Might as well just replace it with a standard flat closed end filter or one with a flat filtered end.