Ever since the weather has gotten colder, we've been having issues with my girlfriend's ranger. It has a little over 190,000. So to be honest, Ive been expecting to have some problems with it sooner or later. Specs: 1994 Ranger, 4.0, AT 4x4
Problem #1: On cold start-up, if you step on the gas heavily to pull out without letting it warm up it will stall out, but not if you lightly step on the gas. Any Ideas? Throttle Position Sensor?
Problem #2: The temperature guage will bounce around. From cold to hot to normal back to hot and so on and so forth. But the truck never smells like its running hot. Bad gauge? Bad Thermostat? (It was changed about 1-1/2 years ago) A friend had mentioned about replacing the Radiator cap with a brand new one, is that just BS or does that make sense?
Problem #3 (and probably worst of all): I changed the oil last Saturday and was not pleased with what I saw. Milk chocolatey brown oil came out. It wasnt over-due for an oil change but that was the same one we drove back from Oklahoma with. I changed the oil (Pennzoil High-Mileage 5W-30) and added Restore Engine Re-storer. The same friend told me that this may be a bad Head Gasket. And if thats the case he said to try running some kind of stop leak in the Anti-Freeze.
Any ideas or info would be appreciated, Im just trying get some other opinions. Thanks guys!