Black, sooty smoke? Lacks power? Coughs and hesitates under load? Hunts at idle? Lousy fuel consumption? It's running rich.
What do you mean 'its running rich' Ipullman? Coz am having those exact problems.
The air-fuel mixture is rich. Too much fuel not enough air. Could be for any number of reasons from a blocked airflow meter to a damaged injector. Check the exhaust pipe to confirm - the inside of the tail pipe should be grey, if it's black and a bit oily, then the engine is definitely running rich.
I the fuel consumption wasn't the first thing reported, I'd suggest running lean (to little fuel and to much air) which is far more dangerous for the engine and because modern engines run very lean, the manufacturers build in a lot of fail safes for that condition.
For an engine to work properly it needs to have a quite precise fuel-air mix. If what's going into the engine diverges from that ideal it will run badly or even not at all.
Take it to a mechanic. Preferably someone who specialises in fuel injection or your make because there are a large number of possible causes these days with so much electronics controlling the engine. I don't know about where you are, but dealers' workshops here are a waste of time and money unless it's a warranty job.
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SOURCE: Hi, the rear windscreen wiper on my 2003 VW polo
The most common reason for this is a blown fuse, so using your vehicle owners book locate and check the fuse first. (if you don't have one then buy a Haynes manual for your car, the cost will pay for itself with the first repair you do). Modern automotive fuses not only have the current rating clearly marked numerically, but are colour coded and the fuses are designed so that you can easily see if they're blown when you pull them out to check. Most modern vehicle fuseboxes have a few spare fuses included and often have a small plastic tool to assist with pulling them out.
Normally a blown fuse needs further investigation as they should only fail if there's been a problem which would otherwise cause fire or other damage, but if wipers are operated inappropriately then it can cause enough load to blow the fuse. Sometimes the wiper spindles can become worn allowing water to get in
and corrode the internal parts; this will cause the spindles to bind or
even seize up and also cause the wiper motor to draw sufficient current
to blow the fuse.
Inappropriate use includes operating the wipers when the screen is dry, trying to use them to clear snow, ice or debris, operating them if the blades or arms are damaged.
If your problem turns out to be more than a straightforward blown fuse then please add a comment to my answer and I'll try to give you more specific advice. If my answer has solved your problem then please return the favour by rating my answer.
SOURCE: blue smoke coming from exhaust.Think turbo is bad
The bearings and seals in the turbo are going bad, so oil is getting burned with the fuel.
SOURCE: Black smoke coming out of exhaust of a 05 VW Golf S SDi
Sounds like a bad MAP sensor. This will cause the same problems. Possibly an oxygen sensor not switching properly also.
SOURCE: 2006 VW tdi black smoke while accelerating
I have the same problem. Do you have a DSG transmission? There are complaints on VW clubs about this problem. It seemed like an engine control issue but it is actually a confused transmission in my case. It seems to have trouble engaging and must send a signal to the engine to kill power. Recalibrating the transmission with VAG-COM made the problem go from a 3x daily issue to a weekly one. I have read that the DSG is very sensitive to oil levels. I am going to set mine properly and see if it helps. The calibration/adaptation only takes 10 minutes with VAG-COM
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