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Discussion Starter #1
So I thought I would bring this issue up and see if anyone had any comments. I have searched around here and other forums without much luck.

This is not a typical case of "turbo lag", turbo leakage, diverter valve issue, transmission or something like a bad MAF. This is what I feel is a straight up drive by wire problem due to either a bad drive by wire part and/or software problem?

History/background - 2003 New Beetle 1.8t 6 speed Tip automatic. car purchased new and reasonably maintained. Car has had EVERY standard VW/Beetle issue and all issues have been addressed.

I believe the problem is a drive by wire issue and it only occurs under very specific circumstances.

No CEL or codes showing up at this point. Will not be able to get a VAG tool on the car for another few weeks. Car starts and runs fine, gets good fuel economy behaves as you would expect except in quick off idle throttle moves, but only while you are rolling under 5-10 miles per hour.

Description of what happens - When making parking lot type moves or coming off light throttle, car still rolling and usually in 1st gearm then getting back on the throttle to merge quickly into traffic or make another move of some sort there is no throttle response for what appears to be 4-7 seconds. Engine just idles, nothing happens. If you hold your foot still, after some period of time the then engine starts to make power. I have since decided to actually floor the gas pedal when this happens to see if the engine responds. What happens is there is still no response, then once response starts, the throttle does kick in harder than if I just kept the the accelerator pedal where I would expect to typically have it for how I am driving.

This is nothing new or just started to happen. I did not drive this car daily for the first 8 years, but I did experience this a few times during the first 8 years when I occasional drove the car. For now, I am driving the almost daily and I experience this problem every few days or so. But I am now starting to see somewhat of a pattern and I am now able to predict when it may happen.

This is not a maintenance related problem, this either a drive by wire component that has been bad since day one, a tuning glitch of some sort or a combination of both.

Also this is not the first drive by wire car I have had, at this point all 5 cars I currently own are drive by wire. I have also owned and driven other turbo cars many years ago. This is borderline hazard as if you are in situation where you maybe pull out, then hesitate to continue, then realize you are committed and have to get out of the way, you are stuck with a car that will not respond. The length of time is enough to have that bad gut feeling that you know something bad is happening and there is nothing you can do about it but just wait and hope for the best.

I need to see what tools I have at my disposal and will start looking at what sensors I can monitor to see if I can narrow this issue down.

I am again just looking for anyone that has experienced this type of problem and if they have ever found a solution. Not looking for did you change your fuel filter or air filter, this and more has been addressed.

I will next try to put some tools on the car and try to record what is happening and then go from there, but thought I would ask if anyone else has felt/experienced this type of issue.
 

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Just a guess but have you done a throttle body adaptation/relearn procedure?

Also another culprit could be the 2 vacuum check valves or even a damaged vacuum line??? Might pay to do a full leak test on the vacuum lines...its very easy to miss a small crack/leak in a line especially since there are so many.

The vag com may be more helpful than anything honestly since it can tell you much more. Just because you have no CEL doesn't mean there isnt info stored on the ECM/PCM
 

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Just a guess but have you done a throttle body adaptation/relearn procedure?

Also another culprit could be the 2 vacuum check valves or even a damaged vacuum line??? Might pay to do a full leak test on the vacuum lines...its very easy to miss a small crack/leak in a line especially since there are so many.

The vag com may be more helpful than anything honestly since it can tell you much more. Just because you have no CEL doesn't mean there isnt info stored on the ECM/PCM
X2 on the vacuum... the wife's turbo had a similar issue, but the lag was not a long as yours. Changed all the vacuum hoses and the problem went away. Also if yours turns out to be a "Drive-By Wire" issue then you will have to replace the Throttle Body as a complete unit.
 

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Discussion Starter #4
Vacuum check valves been replaced quite a while ago and all over vacuum leaks been checked and resolved. Even when the car had both vacuum check valves broken and leaking this did not change anything.

The fuel trims are the best I have seen on most cars, very stable and close to 0.

Throttle and transmission adaptions done a number of times.

Again, this is not a turbo lag, this is a total engine idle and no throttle movement for seconds. The engine has plenty of off throttle power before turbo wind up. I even doubt this is a turbo spool down issue either.

I am leaning more to the throttle pedal issue than the throttle body issue.

This car has had this problem A LONG time now that I think back on when I very first noticed it.

Seems if you are about 15%-20% on throttle in 1st gear, back out of throttle with car still rolling, and you jump back on throttle about where you were before or slightly harder than the car says no way??

Been thinking about a Spring Booster or some aftermarket tune, but I wanted to see if this is really an inherent problem with these cars. Not sure I am going down this path as of yet as this is a fair amount of coin to drop without any guaranteed that the issue will not be amplified or resolved?

Again, I probably have only experienced this problems maybe 20 times in the entire ownership of the car, it is under VERY specific driving circumstances and it has been in the car probably from the 2nd year on, however, I did not drive the car often in the early years, so I only experienced it a few times. I kind of originally thought it might have been a strange one off situaiton, but know that I am driving the car almost daily, I have had the same problem happen maybe 8-10 times in the past 2 months. But the situation is always the same and it is hard to replicate 100%, however, I am now going to try an find a place and way to replicate the issue.
 
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