Question about 2006 Volkswagen Jetta

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2006 TDI Engine Hesitation at Hwy speed?

My 06 TDI has a engine hesitation at Hwy speeds seems to happen while maintaining RPM light load Flat road. Intermitten problem. The shop thought it may be a vaccuum issue? any ideas to help find out what is going on?

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Mine had the same problem and I replaced the fuel filter. Not only did it fix the hestiation issue, I got another 4mpg.

Posted on Jun 17, 2009

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Posted on Jan 02, 2017

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Hours of reading blogs; none show my symptoms: SAAB 95, 2005 Arc. Hiccup/hesitation/stumble when's engine warm to hot, any speed.


Are you talking about a go-cart, or a motorcycle, or a tractor-trailer 18 wheeler? Then OF COURSE, you must IDENTIFY the MAKE, the MODEL, and the YEAR of whatever vehicle you are asking about, if you want any REAL help!

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Torque converter won't lockup on 2006 TDI Rodeo, can this be caused by faulty TPS on throttle body?


Torque converter lockup normally only happens in high gear and when engine is not under heavy load. Sounds as if yours is running so poorly it should not go into lockup. Run compression test to check for blown head gasket.

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Engine hesitation


You have about 10 or more possibles there

Have to road test with scan tool
Check for codes
Look at data
Component test--to find a problem

If you have a failing ignition coil, the problem
can come & go for months & not be found

Aug 10, 2014 | 2012 Acura TSX Base Sedan 2.4L 4-cyl....

1 Answer

Car surging


Is the car equipped with the Automatic Transmission?
If so, read on.
Otherwise skip to the end and answer some questions.

POSSIBLE SCENARIO:
I have observed a condition where my car surges slightly when the torque-converter clutch (TCC) cycles between lock and unlock when driving on an uphill grade.
First some basics and history that will explain why the TCC is used.

Engine, Torque Converter, TCC, and Transmission relationship--
The TCC allows for a solid connection between the engine and transmission which allows the input to the transmission to rotate at the same speed as the engine.
Without a TCC, there is slippage between the engine and automatic transmission. The slippage is greatest at low engine RPM. That is what allows the engine to run with the automatic transmission in gear, like when you first shift into gear or stop at a stop sign. When the throttle pedal is depressed, the engine RPM begins to increase and the torque converter begins to slip less and less the more the engine RPM increases. The car moves. But even at cruising speeds the torque converter slips slightly. Engine RPM is greater than transmission input RPM, which is realized as slight decrease in fuel efficiency.
When acceleration is complete and a constant speed is being maintained, the engine power output is reduced to the point where the TCC can engage and eliminate any slippage between the engine and transmission. If the car has a tachometer the engagement of the TCC can be verified when a slight reduction in engine RPM observed without a corresponding change in vehicle speed.
One method used to test the operation of the TCC is as follows:
Find a flat section of road where it is safe to perform the test.
Reach a steady speed and keep the gas pedal depressed with one foot. While observing the tachometer (or listening for an increase in engine RPM), with the other foot depress the brake pedal enough to activate the break light switch but not enough to engage the brakes. When the brake light switch activates, the TCC receives a signal to disengage. With the gas pedal being held steady, release the brake pedal and the engine RPM should decrease when the TCC engages.
Old cars with Automatic Transmissions did not use a TCC. I believe the TCC was put in use in an attempt to increase fuel economy.

MY EXPERIENCE WITH SIMILAR SYMPTOMS
The condition that causes that issue on my car is this:
- A slight uphill grade increases the load on the engine.
The car tends to gradually slow and it is necessary to depress the gas pedal to maintain speed.
- Depressing the throttle pedal (manually, or automatically with cruise control engaged) signals the torque converter clutch to unlock when the load increases slightly. (A more drastic load increase would signal the Transmission to downshift to a lower gear.) The corresponding increase in engine RPM and output is enough to compensate for the reduction in speed. When the vehicle speed, engine RPM, and throttle position stabilize to the point that the TCC will engage and the engine RPM will reduce in correspondence with TCC engagement. Now, if the road conditions have not changed, power output is not enough to maintain vehicle speed. With the increased load caused by full engagement between engine and transmission, and the cycle (surging) repeats itself until the road conditions change.

Does that help?
If not:

QUESTIONS
Please define the symptoms.
What are the road conditions when the surge occurs? (A slight uphill grade?)
What is the frequency of the surge?
Does the engine power output have a noticeable surge?
Is there a speed change related to the surge?
Does the tachometer move up and down with little or no change in vehicle speed?
Are all instrument indication in the normal range?
What else has changed?

Good luck!

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pushing the accelerator to the floor causes it to go into clear flood mode .the control module reduces the fuel injector pulse width in order to increase the air to fuel ratio. It could be get to much fuel , leaking fuel injectors or a bad fuel pressure regulator . Pull the vacuum hose off the regulator an see if fuel drips from it , if it does the diaphram has a hole in it .

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when you turn on the a/c the ecm increases engine fuel to compensate for extra load could possibly be a vacuum leak

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Regards,DT

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