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 Old 08-25-2011, 06:15 PM   #1
 
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Default car is surging

My car is surging at high rpm's in 4th and 5th gear. It only does it some times. It feels like it is boosting the the boost is gone.. I have no mods are the car know. Like i said it only does it sometimes.

Thanks for help.
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 Old 08-26-2011, 07:47 AM   #2
 
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Do you have any modifications installed?

Surging is frequently fueling issue. HP Pump maybe.

Do you have a Dashawk installed so there are data logs?
Do you have the ECU Error code?
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 Old 08-26-2011, 04:23 PM   #3
 
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Leaking turbo pop-off valve-forgot the exact name of the valve. I would also check all connections on the air intake including from and to the intercooler.
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 Old 08-26-2011, 07:00 PM   #4
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Did you fix the previous issue?
CEL
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 Old 08-27-2011, 05:37 AM   #5
 
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The car is 100% stock now. I made the dealer put it back to stock.

I think its the stock BPV? I am not for sure.

I have notice surging real back when the air is on.
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 Old 08-27-2011, 05:45 AM   #6
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Doubt the bpv is the cause. Wonder if they fixed the first issue. Now one thing with 07's is the ac compressor going bad. It might be seizing. Take it in. Warranty for it extended to 5/60. I'd push issue #1 to make sure that is fixed.
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 Old 08-27-2011, 05:50 AM   #7
 
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I had my ac and turbo replaced just before my warranty ended! I guess I lucked out!
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 Old 08-27-2011, 06:00 AM   #8
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Luck is if vvt went shitty and was replaced too. It's $1200 out of pocket. At least it's just a few known issues. My gmc had 30!
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 Old 08-28-2011, 11:56 AM   #9
 
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the AC blows just fine and its cold. I dont think its the AC but I will have it looked at.
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 Old 08-28-2011, 12:28 PM   #10
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Bad O2 sensor is my guess, 2187 is prolly still a problem...
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 Old 08-28-2011, 03:05 PM   #11
 
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I have had all the CEL fixed and the stock air box put back on it. the only thing its doing is surging every once in a while.
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 Old 08-28-2011, 04:51 PM   #12
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What was done to fix the CEL? I want to help, but you are not giving much details, at all.
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 Old 08-28-2011, 06:27 PM   #13
 
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What ever the dealer did. I think they resect the ecu. It runs just fine. It just surges in the top of 4th and 5th sometimes. The CEL has not been on for about 2500 miles. will a boost leak make it surge? One of the intercooler hoses looks like it is on but it is about a 1/4inch from the top. I will make it fit a little better and see it that fixes it.
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 Old 08-28-2011, 06:37 PM   #14
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Resetting ecu makes the light go off, but I bet you still have the core problem. Make them fix it.
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 Old 08-29-2011, 11:04 AM   #15
 
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I will take it in and see what they say.
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 Old 08-30-2011, 11:16 AM   #16
 
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1. You are running Premium Octane Gas right?
2. Loose hose to either the TMIC or BPV can make it surge/stumble.
3. TCU if not with the last reflash can cause the car to surge between 5th and 6th gear. Updated reflash solves this.
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 Old 08-30-2011, 11:40 AM   #17
 
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Originally Posted by Alpha Wolf View Post
1. You are running Premium Octane Gas right?
2. Loose hose to either the TMIC or BPV can make it surge/stumble.
3. TCU if not with the last reflash can cause the car to surge between 5th and 6th gear. Updated reflash solves this.
I found it it was a hole in the line running to the BPV.......Thanks you.....
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 Old 08-30-2011, 11:54 AM   #18
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Doubt that was the source for your problems.
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 Old 08-30-2011, 01:53 PM   #19
 
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the hole was were the cover for the intercooler rubed the boost line going into the BPV and it was big. I ran it pretty hard to day and it has not surged any. But like I said ealer in the post it only does it some times. If it surges more I will post up. I have checked and the dealer has check everything and they say everything is good.
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