Ford ranger 2.5 L. Its smoking badly and having a hard start every time when you try to start. what can be the problen?
Glow plugs if it's happening in the morning on a cold start
you can test this by, turning key to 2nd turn..... not starting it.. wait for glow plug on dash to go off, then repeat a second time, wait 4 seconds then start the van. if it starts easy, then it's the glow plugs. easy to change, not to bad in price
but if it's still hard to start, Then my friend there will be a few tests you will need to perform.
1. dye test the cylinder head, this is to see if any cracks, basically it's a test tube thing that fits to the water bottle / radiator cap inlet with a chemical in it, it will change colour (yellow) if the head or head gasket has a leak - (if carbon monoxide "aka" exhaust fumes mixes with the water) .. there will be plenty of people that will say that if the head or head gasket is gone on a diesel then it will not start as it needs compression, let me tell you with enough swings of the engine especially in a ford ranger where the engine is a rugged beast then it will generate enough compression, believe me. That's why i personally perform the dye test just to be sure. Test best performed when engine is hot and literally a 5 - 10 min job
2. If the head is ok then injectors and diesel pump overhaul and retune
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Sometimes diesel engines will put out black smoke under extreme acceleration. Other than that, they shouldn't smoke. Black is excess fuel, White smoke is water and bluish is oil. White smoke on a cool morning is not necessarily a sign of a problem unless it happens every time you start it through a warm day. Hope this helps.
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