Hard starting jeep grand cherokee 2001 4.7 V8. new gas filter, pump checks out OK and holds pressure.Injecters OK and not leaking down.new cam sensor.125000 miles.on car. New plugs 25000 miles ago.hard starting overnight setting.
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Your oil pressure will increase and decrease with the speed of the engine. As long as your oil pressure increases, that's ok. The idle problem could be caused by a dirty fuel or air filter. I would start with replacing the fuel filter and check the condition of the air filter.
There is a plastic vacuum pipe which goes from the top of the engine to a solenoid behind the air filter.mine kept popping off due to no clamps holding it at each end( this being a 2002 limited v8) and the revs would go high when started.I bent the bracket on the solenoid so ther was less space between the two and its been fine.Also a pump or two on the gas pedal before starting lessens the revving.Hope this helps.davodown.
Disconnect and replace fuel filter.With filter disconnected have someone momentarily turn key to on position to see is fuel pump is working.Make sure you have lots of rags,a drain pan and safety goggles on
sounds like a bad pump, filter or both. Do some testing before replacing though, a bad crankshaft sensor can do pretty much the same thing! Parts are not cheap...testing is very important!!!
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