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September 20th, 2013

My suburban diesel is hard to start when the engine is warm,why?

Its a 1986 6.2 Diesel,starts right up in the morning,but when the engine is warm and its hot outside she wont start.Then I have to put a little gas in the airfilter and she fires right up.( With a lot of noise)
Any help out there?

I have worked on that engine for 17 years in the Army and have seen this problem over and over. The same engine you have is in the HUMMWV. First thing, never put gasoline in the airfilter to start the engine. You will damage the engine beyond repair. You need to first have a load test done on both of your batteries. If the batteries check good, then you need to have the glow plugs checked. A good chance stands that either the glow plugs are burned out or the glow plug relay and possible the glow plug circuit card is not working. When that is confirmed good, you need to have the starter checked for "dragging" while cranking the engine. A starter can be bad and still work at the same time. Basically, the starter heats up due to a shortage and wil not provide enough amperage to start the engine. If all of that checks out, have the charging system (alternator) checked to ensure it is properly charging the batteries. You are probably thinking that it does not make since for an ice cold engine to start and a hot one not too. This is a diesel engine, it can be just as hard to start a hot one as a cold one. The first thing in the morning, your batteries have sat overnight and hold a good charge. The first crank of the day provides enough compression to start the engine. When you have started the suburban and used electricity, radio, lights, etc, this has drained the batteries. Then, when you want to restart, it will not. Check all of the above and chances are that the glow plugs have burned out. Always change all eight as a new set.

Good Luck

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