so I've had a CEL for a while now for my maf if i remember correctly it was a p0102 which caused me to run rich. so recently i replaced my maf and got rid of the CEL. the car ran fine boosted smoothly etc for a bout 20 or so miles and then started to only boost up to 5 psi and hold there all the way through the rpms. i tried disconnecting my battery to see if it would happen again and because it looks like my maf was a lithe loose so i tightened it up. again it ran perfectly for about 20 miles than would only hold at 5 psi. If a CEL comes on any time soon i will run the codes and post them here but until then does anyone have any idea what could be causing this? All i have done to the car is apr stage 1 and a K&N intake. thanks for the help guys

 

could be a number of things... u definately need to pull the codes.. o2's and egts can cause limp, boost leak... ect.

 

So i just went to auto zone because i couldn't find my scanner and ran the codes. the guy deleted them before i could look at the actual numbers but from what i read i had 2 one was for air fuel metering which i figured i fixed with the maf and the other one was misfire in cylinder 2. I didn't have any misfire before i replied my maf and i just did my plugs about 1000 miles ago. could it possibly be a coil?

 

possibly a coil. if the guy wouldn't have deleted the codes, you would be able to swap the the coilpack and see if the missfire follows. What are your plugs gapped to?

 

I just recently did my plugs and if i remember correctly i have them set at .028? anyways i just switched cylinder 2 plug with number 3 to see if that would follow at all and this time when i fired the car up i had an instant cel for my cam position sensor the code is p1340. The car was boosting fine again for a little while and is now yet again only going to 5 psi. could a bad cps cause a misfire? and if so would it be as simple as just replacing the cps? thanks for the help guys

 

0.028" should be fine on the plugs.
here is what ross-tech has on their site for the cam position code.
17748/P1340/004928
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Contents [hide]
1 17748/P1340/004928 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28): Incor. Correlation
1.1 Possible Causes
1.2 Possible Solutions
1.3 Special Notes

17748/P1340/004928 - Camshaft Position Sensor (G40) / Engine Speed Sensor (G28): Incor. Correlation
Possible Causes
Timing Belt/Chain incorrectly installed
Timing Chain probably lengthened
Camshaft Position Sensor (G40) faulty
Engine Speed Sensor (G28) faulty

Possible Solutions
Check Timing Belt/Chain installation
Use Measuring Value Blocks (MVB) to Check Timing Chain
Check/Replace Camshaft Position Sensor (G40)
Check/Replace Engine Speed Sensor (G28)
Special Notes
When found in the 1.8T engine, check engine oil pressure. The oil pump pickup may be restricted.
When found in the 1.8T engine (possibly others too), check to make sure the correct G40 is installed (single gap versus 4 gap).
When found on VR6 engine, please see Technical Bulletin 15 04-01
When found in a 30-valve V6 gasoline Audi engine (such as EPB or BEL), DTC 17755 may be stored as well. If both of these codes are displayed simultaneously, and the codes only appear after the motor is revved above 1800RPM, then the issue is likely that the cam chain tensioners were installed on the incorrect heads (drivers' tensioner on passenger head, etc).