Jetta - Volkswagen :: 2003 GLS Lagging On Acceleration Right Around The RPMs When Shifting


Jun 24, 2016

I have an automatic 2003 Volkswagen Jetta GLS with 138,000 miles on it. I bought her four years ago with 91,000 miles. Right after I got her, I noticed that she'll jump a little when when she's cold (i.e. ease on the gas for the first few miles until she drives more smoothly). Looking around the web, this seems to be fairly common and most forums say that it shouldn't be a cause for any alarm.

More recently though, she's started to lag when I accelerate right around the RPMs where she should be shifting. For example, increase to about 3000 RPM, then it feels like a second of free fall, then she'll catch up and be just fine.

I took her into a shop to get it looked at about 3 weeks ago - initial thought had been maybe an issue with the transmission fluid (did a flush back in 2014 / 110k miles). The mechanic refused to do the flush until I had the catalytic converter and downstream O2 sensor replaced. The previous owner had installed a modification to the sensor and the wires had got too close to the converter and melted.

We noticed the check engine light about a year ago and had it looked at, but the mechanic then said it wasn't a huge issue and was really only going to affect our gas mileage so we held off. Since this mechanic was fairly certain that this was causing our issue, we went ahead and had the repairs made. No luck. Haven't had a chance to take her back to the shop, but I figured I'd ask to see if we were at least on the right track.

Second issue. My wife and I share this car, and her commute is significantly further than mine. She says that four times over the past two months the car has shut itself off when it comes to a stop. Not a common occurrence given the amount of driving we do, but enough to be concerning.

I've had regular oil changes and kept up with the routine maintenance over the past four years (new spark plugs, air filters, etc.). Just got a fuel system flush with the catalytic converter repair three weeks ago. Haven't changed the battery since I bought her, but every time we get the oil changed they check it and say it's good.

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Also, whenever I stop the car and put it into first gear, there's a loud thump that I can both hear and feel coming through the steering wheel and shift knob. It's been doing this since I bought the car. I brought it to VW and they said it's probably just because the gears are still spinning when I put it into first. But it still happens if I wait several seconds to put it into first.

Is this a sign of a bad transmission or one on its way out?

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My mechanic worked on it recently and replaced a sensor in the distributor and the crank shaft sensor, because they showed up on the diagnostic as bad. Once his work was complete, he said he sprayed the engine with water and it started. So that was a week ago and it's raining and it won't start, the engine just turns over so it's not a starter issue. The car only has 143,000 but I am gonna get rid of it this fall but I just wanna know what this wet weather problem is.

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Whenever I'm accelerating (most noticeable in lower gears), it seems like the turbo can't keep up. Used to sound like a nice clean consistent whooooosh spooling up, but now its more like brrrr......brrrrr......brrrrr.....

Don't know how else to describe it. Seems to start and stop frequently. Will try getting a video clip of this tomorrow.

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I feel it is important to mention that he had also run codes on the transmission and nothing came up. Taking it home, this morning I had replaced the spark plugs and driven it for about an hour both regularly and aggressively to test it. The problem is still there, and I was really hoping that there is a solution to this problem, because everything else on the car is beautiful, while being my dream car, I just want it to work as well as I know it can. To be more descriptive, when shifting to 3rd the whole car feels basically like it is tripping over itself before successfully shifting.

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[URL] .....

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