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Have Astra GTC which drives perfectly but when going to check the water a feed days ago it was pressured (hadn’t drove since day before) and was throwing out water.
Still drives fine, no engine lights or anything but after stopping it starts smoking badly
Garage have changed thermostat and still not better?
Any suggestions which isn’t the head gasket?
 

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Black Smoke from Diesel Exhaust. Or as many people call it, “rolling coal”. People throw tuners, modules, or some kind of smoke switch, onto their diesel to make the truck add more fuel than necessary to create black smoke, as well as install larger injectors. But for those who don’t intend to smoke out everyone behind them, there’s quite a few things to check. A little black smoke is normal on a properly functioning diesel, but keep an eye on the amount of smoke at different RPMs and loads so that you will be able to tell if something is amiss. Incorrect timing or air/fuel ratio, dirty injectors or common rail injectors staying open for too long (too much fuel), a worn turbocharger, dirty intake manifold or clogged air cleaner, low cylinder compression, poor quality fuel, or excessive carbon built up in combustion chamber can all be culprits.
Stiction Eliminator is a great place to start when trying to get rid of black smoke. It will make sure the turbo internals, camshaft, and HEUI injectors are cleaned and lubricated. Stiction Eliminator helps restore compression to ensure that the combustion chamber is in optimum performance. For other situations a dose of Diesel Extreme might be what you need to clean out those injectors coked with burnt fuel and get them firing like new. Replacing your air filter, checking the intake manifold out, or fiddling with your aftermarket tuner might be the answer. If you are not sure what you are doing when adjusting your air/fuel ratio, don’t be afraid to ask a professional. Running rich (too much fuel) is always better than running lean (not enough fuel). A lean air/fuel ratio can damage an engine in a short amount of time.


Just Google black smoke diesel and got this..
 
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