my $300 question
#1
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L 6cyl
my $300 question
So I acquired a 1991 xj for $300, replaced the fuel pump and filter, changed the firing order (perviously had the coil going to a spark plug output) and replaced the plugs. With a cough and a bang it started right up and after a minute of finding a sweet spot, it idles better than my daily driver. smoke goes away, running like a top, great oil pressure, and it overheats six minutes later. My question is has anyone had symptoms of it heating up that quick? And if so, what fixed it? I have a flush and new fluids in the agenda already. Thanks in advance.
#7
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Are all the components of the cooling system there? There could still be an oil/coolant mix happening even though it's not visible so I wouldn't run it.
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L 6cyl
They are all there. Ill change the oil to have a better look at it but everything looked really good for 160xxx miles and sitting under a tree. In fact, the coolant still had its neon tint to it when It flowed out of the cap. No trace of anything that shouldn't be there. I will say that the cap that came with it was worn out though. When it overflowed out of the old cap, the first time, it was at 210. I put my new cap on from my dd and it held its pressure even when the temp went to the red zone (Which happened I think from the engine not having enough cooling from the first overflow).
Last edited by Cherokoolguy; 02-10-2018 at 11:56 AM.
#9
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It could be something as simple as a bad cap but not knowing the condition of all the components is an issue. I guess I'd start with a good flush and see what comes out of the system.
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Year: 1990
Model: Cherokee (XJ)
Engine: 4.0L 6cyl
Wow, well in that case ill do a stat, a cap, and a flush. That would make sense because my cooling fan didn't come on when it reached 210, and Im pretty sure the stat opening engages that.
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Year: 1989 xj sport 2dr
Model: Cherokee
Engine: 12 hole bosch Injectors
Fan is activated by coolant sensor. Sitting 8 years flush, new upper and lower hoses and thermostat replacing at the minimum should be done.