Does Your VW TDI Diesel Engine Hiccup or Hesitate When Accelerating?

Updated on January 20, 2019
perrya profile image

Perrya is a major car enthusiast and loves sharing his extensive vehicular knowledge with his readers.

The VW diesel (TDI) engine is one tough engine capable of going 500,000 miles when maintained. However, it has its issues. The 2006-11 VW TDI models seem to have a common issue, as shown by complaints to NHTSA about hesitation and or a "hiccup", that is, a split second pause, usually when when accelerating.

Most of the time, the "hiccup" lasts a second, but to a driver, it is very noticeable—enough to cause an "Aha!" or "What's that?" freak out. It can be sporadic or frequent. Some drivers become accustomed to it, and the VW dealer will claim it is within normal specs. But the last thing you want when accelerating is a one-second pause or loss; it could happen at precisely the wrong time.

Possible Causes of TDI Hesitation or Sputtering While Accelerating

There are a couple of possibilities to check out or tell your mechanic to check out.

  1. Excessive oil gathering near the lower end of the intercooler. Disconnect the lower hose of the intercooler with a container ready to catch any oil. There should NOT be more than 2 tablespoons of oil collected there. If there is, this could be an indication that your turbo seals are leaking. If there is much more than 2 tablespoons, consider a turbo replacement.
  2. Your EGR, which recirculates exhaust gas back into the intake manifold (pre-turbo), could be getting clogged with soot from the diesel. It does happen. It could also have some water droplets (not good). Disconnect the EGR and inspect inside for excessive soot, and clean it out.
  3. You may need to update your computer software for the car at the dealer, if available. The software the engine uses regulates the EGR valves opening and closing. VW knows it is not perfect software, and small gaps appear as valves open and close. In some cases, when new software was downloaded, the hiccup went away, in other cases, the update did nothing.

The slight hiccup is mostly likely one or all of the above. It is not usually a serious issue but is more of a nuisance. Drivers with a DSG tranny in the low gears may have it also, but in that case, it is simply due to the split-second timing between gears. Diesel engines are different than gas engines.

What to Do

If the hiccup is due to soot, you can try the following to try to remedy it:

  1. Go up a hill or straight stretch at 3000–4000 rpm for a sustained time to blow out and remove soot from any gathering points.
  2. After the engine is warm, when getting on a road, accelerate quickly through 2000 RPM to blow out soot.

Some people think the hiccup is caused by the turbo: it isn't. If the turbo stops, you will have tons of black smoke, and your car will limp or stop functioning.

Oil Side Note: VW Diesels require special oil to be used to prevent rapid cam wear. If you are unable to find the special oil, a perfectly good oil is any synthetic brand with a API rating of CJ-4 or CI-4, which is easier to find.

This article is accurate and true to the best of the author’s knowledge. Content is for informational or entertainment purposes only and does not substitute for personal counsel or professional advice in business, financial, legal, or technical matters.

Questions & Answers

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      • perrya profile imageAUTHOR

        perrya 

        6 months ago

        Check the fuel injectors, it only takes one bad one to cause havoc. Dirty fuel, fuel lines or fuel tank if diesel. The 06 injectors were both mechanical and electronic and unless the electronic part failed, there would be no code.

      • profile image

        Leo C Huppert 

        6 months ago

        VW 2015 TDI PASSAT, 45 K THROTTLE HESITATION WHEN ENTERING FREEWAY SPEED MERGING WITH TRAFFIC PRESS THE THROTTLE NOTHING THERE ITS FLAT STAYS SAME SPEED.TOOK IT TO VW dealer computer shows nothing , ????

      • profile image

        Leo C Huppert 

        6 months ago

        2015 VW TDI PASSAT45 K HAS THROTTLE HESITATION WHEN ENTERING FREEWAY SPEED MERGING WITH TRAFFIC .

      • perrya profile imageAUTHOR

        perrya 

        13 months ago

        New injectors? Was the fuel tank removed and cleaned?

      • profile image

        Medzid 

        14 months ago

        Hello, I own a Audi A3 8p 2.0 TDI (BMM) with 6 speed DSG 2006 year. After complete engine rebuild (all new gaskets including the one from tandem pumpm, new injector seals, new egr ventil, new timming belts.... every single moving part inside and outside the engine was changed with completley new parts and clean) started to hiccup on half gas pedal (about 2000-2500rpm). There are no error codes, no smoke but still the hiccup is there. Like I said everything was changed and the engine is like new so what coould cause this??

        All seems to be perfect...

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