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Issue with the Leak Detection Pump causes Delayed Acceleration?


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r286ps2
User

Sep 14, 2018, 9:29 AM

Post #1 of 12 (282 views)
Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

 
This is a 2005 VW GTI 1.8t Automatic.

I am noticing severe under boost and delayed acceleration when hitting the gas pedal with the occasional limp mode. The car on occasion disengages when at cruising speeds as if it lost power. So I am searching for a vacuum leak however I have no fault codes. I do hear a air woosh sound when I hit the GAS.

So I investigated and found that the Vacuum Line that goes to the Leak Detection Pump from the Purge Valve looks to not be holding a Vacuum. However, is this line suppose to hold Vacuum or is it an open loop? Also, wouldn't a Vacuum Leak from the Leak Detection Pump cause a MIL light. I have no codes when I run the ODBII scanner. However, if the LDP is the device that generates the MIL if the device is faulty could it possibly not generate the MIL?

Any Ideas? Here is a picture below of the line that does not hold vacuum to the LDP.




Discretesignals
Ultimate Carjunky / Moderator
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Sep 14, 2018, 10:06 AM

Post #2 of 12 (261 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

The vapor line between the purge valve to the charcoal canister shouldn't have vacuum in it. When the computer wants to purge the canister it will turn on the purge valve, but there shouldn't be vacuum building up in that hose. There is another hose that goes from the intake manifold to the LDP that should have vacuum while the engine is running.

Usually if you have a vacuum leak it will cause the computer to trigger a lean DTC. Surprised that this problem your having isn't setting some sort of DTC. Vacuum leaks usually don't cause loss of power on acceleration.





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r286ps2
User

Sep 14, 2018, 10:17 AM

Post #3 of 12 (257 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

Thanks, so I am back to the drawing board to what the problem could be. Any ideas of what issue will not cause a MIL and cause severe Delayed Acceleration. It seems to be very sluggish.


Hammer Time
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Sep 14, 2018, 10:26 AM

Post #4 of 12 (253 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In


Quote
delayed acceleration when hitting the gas pedal with the occasional limp mode.


It takes a code to trigger limp mode.



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r286ps2
User

Sep 14, 2018, 10:40 AM

Post #5 of 12 (247 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

I am going to have to get a better scan tool. I suppose my old ODBII is not able to pick up the code.


Hammer Time
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Sep 14, 2018, 10:44 AM

Post #6 of 12 (241 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

Or you are doing something to erase it.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



r286ps2
User

Sep 17, 2018, 3:08 PM

Post #7 of 12 (196 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

I got a better tool and ran a scan, it did return a code P0411. Secondary Air Injection System Incorrect Flow Detected. I wonder if this is the problem.


Hammer Time
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Sep 17, 2018, 4:07 PM

Post #8 of 12 (186 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

No, that's an emissions code. No effect on engine performance.

I don't think it's a vacuum leak that you are looking for. Possibly an air leak in the intake snorkel but that is doubtful too.

I would be more inclined to look for an electronic throttle issue.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



r286ps2
User

Sep 24, 2018, 6:28 AM

Post #9 of 12 (141 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

I think the issue may be the MAF. I bought one a couple years ago I thought was a authentic Bosch one but now when I compare it to the original part I noticed it is not the same. Could this be a Chinese counterfeit Bosch part? I am confused but I am thinking this may be the problem after-all. Here are the two pics of the part that are suppose to be the same.




Hammer Time
Ultimate Carjunky / Moderator
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Sep 24, 2018, 7:01 AM

Post #10 of 12 (134 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

It says "Made in Germany" right on it.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



r286ps2
User

Sep 24, 2018, 7:36 AM

Post #11 of 12 (130 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

From my research it doesn't mean it is actually made in Germany. The Chinese are very good at making fake parts also on the reverse there is a clock dial and they both point to different #s. Something isn't right. The #s do not match up and the subtle differences in the part are apparent.

Also, Bosch apparently has manufacturing in China now. Something I did not know until recently. If that is the case the Chinese will easily be able to replicate their products if they have a presence in China.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Sep 24, 2018, 7:41 AM

Post #12 of 12 (126 views)
Re: Issue with the Leak Detection Pump causes Delayed Acceleration? Sign In

Maybe they know where Jimmy Hoffa is buried too.


Those are batch codes. There is no conspiracy here.



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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Sep 24, 2018, 7:43 AM)






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