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Old 03-11-2015, 04:45 PM   #1
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Problem after Paxton install.

Ok, since installing my Paxton, the car jerks as I am accelerating in just daily driving. I thought it was my belt slipping since It was loose. I moved the pulley over and now the belt is tight but it is still doing it. When the car was on the dyno, it couldn't make boost. The dyno guy said he thinks it was because the bypass valve was hanging open and not closing to generate the boost. It was hanging around 3 lbs of boost and wouldn't go up. It did make it like 2 times out of the 7 that he ran and the results were good. He said the bypass valve may be faulty. I'm not sure if this would have anything to do with it but I wouldn't think so since I am accelerating normally and shifting around 3k rpms. If anyone can offer some help it would be much appreciated.
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Old 03-11-2015, 04:56 PM   #2
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Check all intercooler connections sounds like you blew off a hose.

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Old 03-11-2015, 07:46 PM   #3
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Check all pipes and vac lines. Easy place to start. A significant leak like that shouldn't require a boost leak tester.
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Old 03-12-2015, 08:42 AM   #4
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If your boost gauge only reads 3psi, you do have a significant leak. It could be either the BOV hanging open or a charge pipe not connected. Have you clocked your MAF sensor? (orientation) What BOV are you running? I have a brand new never used or installed MaxFlo Race BOV. I bought it and a Tial and installed the Tial and liked it so never installed it. I can make you a heck of deal on it. It is a significant upgrade to the stock BOV



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Old 03-12-2015, 12:47 PM   #5
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i am just running the stock bypass valve. I went over the pipes and they were all hooked up tight. I have not clocked the maf sensor. not sure how to do that?? shoot me a PM on the price for that BOV to 29730
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Old 03-12-2015, 12:56 PM   #6
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the BPV hanging open wouldn't cause the jerking at such low rpms would it? since I wouldn't be hitting boost at that point anyway. There isn't but a couple vac lines. Only put a "T" into the one at the back and ran the line to the BPV. I will recheck those today after work
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Old 03-12-2015, 02:46 PM   #7
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PM sent. Take a pic looking straight down on the pipe your MAF is on.
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Old 03-12-2015, 03:42 PM   #8
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I am 90% sure your MAF position needs to be adjusted. If you have it at 4 or 5 o'clock, (looking straight down from the top - standing in the front of your car) it DEF needs to be moved closer to 2 o'clock. It needs to be in line with the 90 degree bend above it. It is about laminar flow. You need there to be no turbulence going over the MAF sensor or it can cause rough idle, hesitation, stall etc.
The BOV sticking open would cause loss of boost pressure. It does only need to be T'ed into the vacuum line. The BOV opens when you let off the throttle, and closes when you accelerate, controlled by vacuum pressure
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Old 03-12-2015, 03:55 PM   #9
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I'll look at that tonight as well. I will adjust it when I install the new BOV since i'll have to remove those tubes from the TB to get to the BPV anyway.
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