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Modern cars and diesel warm-up time

I have both a 2004 Bora TDI (Jetta Mk4 in the US) and a 2012 Mk6 TDI Golf. When either of these cars requires it's warm up system, it will automatically switch it on for the time it needs. This is ...
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12 votes
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What is that sound?

It is the sound of the fuel pump priming and pressurizing the fuel lines, which is absolutely normal. VW likes to use the opening of the driver door to trigger fuel rail pressurization. In fact, one ...
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11 votes
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What does the green clock sign mean?

There's nothing wrong, that's your cruise control icon, it's lit when you activate cruise control. Cruise control won't do anything until you use the set button so it's not a problem, just turn cruise ...
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8 votes

Battery Positive Post Meltdown

Melting = Heat. Heat in an electrical circuit is caused by resistance. In your case, excessive resistance. If you're replacing batteries, one could guess that you are cleaning the posts and the inside ...
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  • 3,592
8 votes
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Water temperature randomly drops while car is in motion (VW Golf Mk6)

It can be: a sticky thermostat Hard to diagnose properly without an independent thermometer, because a lot of modern cars show 90C at the dashboard while the temperature varies between 75C and 125C. ...
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7 votes
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VW Mk4 Golf/GTI airbag indicator warning light

I took my car to a different VW shop (not the dealership) and they fixed the problem for $160, but if I'd known the solution was just to solder the wires directly together, I could have fixed it ...
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  • 403
7 votes

Water temperature randomly drops while car is in motion (VW Golf Mk6)

I think you can probably boil it down to (no pun intended, lol) a bad thermostat. It sounds as though its just not working as intended. You can pretty much eliminate the ECU as part of the problem, ...
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6 votes
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Steering suddenly has become very loose

Found it was because a bolt holding the steering rack in place had sheared. Very dangerous and glad I decided to visit a mechanic!
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  • 3,594
6 votes
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Why do I get a "30km/h speed has been exceeded" dashboard message?

Most VW/Audi/Seat cars have a setting for a speed warning, every time you exceed it you get a bleep. It's annoying, but you can turn it off, or simply set it to something high where a warning makes ...
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6 votes
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Any techniques to remove rust from inside fuel tank without removal

Given what you've said, I'm assuming the rust is in the form of small, dry flakes and dirt. Is the tank fully dry, or is there still some fuel or other liquid in there? If it's dry, you might be able ...
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  • 28.6k
5 votes

Car stalls when braking (VW Mk1 Golf)

Problems like this are addressed in Charles Probst's excellent reference, Bosch Fuel Injection & Engine Management. From what I can gather, the Mk1 Golf utilizes a basic K-Jetronic system ...
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5 votes
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Right side highbeam not working on on Mk2 Golf GTI - not fuse or bulb

Bulbs - Swap the bulbs, like the comment suggested, with the ones on the other side. If works switch back and get replacement. Fuse - Swap the fuse with another in the fuse box with the same rating. ...
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  • 66
5 votes
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Golf mk3 TDI has pressure in the cooling system

tl;dr: Your radiator cap might be working as advertised and releasing a bit of overpressure. The difference is points one and two is telling. In point two, you're explicitly staying out of boost on ...
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5 votes
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AC Recharge- What did I do wrong?

You should have been charging on the low side not the high side. But it's actually good that you weren't able to top off the system. You should never use that stuff in any car AC system and it's ...
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5 votes
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Changed thermostat but now constant leak around thermostat housing

Found out this actually requires another O-ring, not a gasket. Another O-ring came with new the thermostat and I was able to use that.
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  • 3,594
5 votes
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Engine sputtering, not accelerating. Left for 20 mins and is now fine?

Your Golf should have two fuel pumps: one for the injectors (high pressure) and one which feeds the injector pump (low pressure). The low pressure pump would reside in the fuel tank. I'm thinking the ...
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5 votes
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The inner part of the left rear tire is covered with oil

There isn't an oil source that I can think of by the rear tires of a Mk4 Golf, as pointed out in the comments a brake fluid leak seems much more likely. Brake fluid is normally clear, but it could be ...
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5 votes
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Do I need any special tools to replace a ball joint that appears to be able 'bolt on'?

Just to integrate the comment of Ben and the answer from Chuck: Most of the time the ball joints are riveted to the suspension arm, then you need to drill the rivets to remove the joint. The top of ...
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  • 7,828
4 votes

Mk5 golf lacking boost and smoke before turbo

Your Golf's turbo has a solenoid operated control to vary its geometry. I remember it as part N75. If this is in any way faulty you will have most of the symptoms you are describing. A hand-held ...
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4 votes
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Is it possible to paint my Mk1 Golf Engine in either Matte Black or Grey? If so, how?

The ultimate answer is "yes". You can paint it lime green with purple polka dots if you really wanted to. If you want to do it right and make it look good, you'll need to: Pull the engine/...
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4 votes

Why check oil when engine is at operating temperature?

Unfortunately, the answer of "In asking you to check when the engine is hot, the oil will not be pooled in the oil pan. Instead, it will have been fully circulated to all the moving parts that badly ...
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  • 49
4 votes
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VW Golf IV Possible Engine Misfire

It means that your camshaft position sensor or crank angle sensor is faulty. Either because they are actually faulty, or there is a wiring problem. Clearing the code won't do much. The symptoms of a ...
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4 votes
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golf mk1 1990 clutch problem

It's a common problem on the Mk1 that the clutch cable pulls through the bulkhead and the repair plate is usually all that is required, however you may find that this no longer gives you enough travel ...
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4 votes
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Briny/salty smell from fuel tank?

OK, so the problem was that, due to a faulty fuel gauge sender, I over filled the tank. And since the seal around the top of the 'hatch' had partially disintegrated, well this happened: When parked ...
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  • 3,594
4 votes

WV Golf IV '98 - Right side blinkers not working on signal

It sounds as though the turn signal switch has gone bad. The contacts inside the switch are probably just worn out. Not sure on your Golf, but I believe these are pretty easy to purchase and to ...
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4 votes

The inner part of the left rear tire is covered with oil

As others have commented - there aren't engine oil lines or a reservoir that contains engine oil near the rear of the car so you can almost rule out your own engine oil as the source. To verify, you ...
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  • 141
4 votes
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What kind of spark plug should I choose for LPG conversion?

Platinum is going to work best in this application, because platinum will stand up to the rigors of the LPG better. Iridium would work even better. There are several other types which would work even ...
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4 votes
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Idle dipping and rising when headlights are on - not Idle Air Control Valve

Check that your alternator belt is tight and in good condition. Also check that your battery is fully charged and in good health. There is a real possibility that the fault is being cause by the ...
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4 votes

What could be causing fuel pumps to die?

There are a few causes for repeated fuel pump failure. A dirty tank with sediment in it will clog the "in tank" filter (also known as the sock). This causes the pump to work harder and hotter ...
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  • 19.7k
4 votes

What could be causing fuel pumps to die?

One more thing to check is the voltage at the pump. If it is low, then the pump will draw more current, this in turn will cause more heating and heat is the mortal enemy of all things electrical. ...
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  • 14.3k

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