2002 Blazer w/diminishing fuel economy

5 messages, Last post on Mar 12, 2008 at 2:47 PM

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#4 of 5 Re: 2002 Blazer w/diminishing fuel economy [jaslilhon] by repairdog Jan 04, 2007 (12:20 pm)
Replying to: jaslilhon (Jan 04, 2007 9:18 am) Radiator pressure may be off so get a new Stant cap and the white smoke could be water (Dex cool) from the classic leaking lower intake manifold gasket on these 4.3s. Any slight lifter tapping at startup? When cold fill the reservior to the hot mark and run a few days and see if the level drops when cold again. Often the leak is into the valley and you never see it. Then look at the waterpump (2) small holes on top and bottom and see if thats leaking. Most auto stores have a free use rad pressure tester so you can do it yourself and you may spot a leak or see the pressure drop and good indication its the intake gasket. Fluid loose could be from a heater core also but you smell that inside the cabin. MAF is in the air intake above the filter (metal grid holds the small resistors) and carfully spray clean with MAF, electronic or brake cleaner - not carb). Also if the cap does not solve the raise in temp and not the intake or waterpump, there the fan clutchup front - should be loud on start in hot weather then release and if idleing getting hot lock up again and get louder.
#5 of 5 98 Jimmy... by dan132 Mar 12, 2008 (2:47 pm)
Can anyone say if you can take the oil pan off the engine with the engine still in truck? Thanks in advance.