99 Ranger V6 Flex Fuel overheating - Long read!
I was hoping the experts here could give me some advice. I am ultimately thinking Head Gasket. But, I have some weird things happening.
My problems started summer of 2010. I was pulling my sea-doo boat to the lake and just before I got to the exit, my oil pressure dropped and my engine started rattling and I lost power. Next, the engine overheated. I pulled over immediately. My check engine light came on and I had the truck scanned. The error code was cylinder 2 and 5 misfire, and a bad 02 sensor. The sensor was on the passenger side post exhaust.
So, I replaced the sensor and the error code went away. The truck ran fine for a while. The next problem started a few weeks later. The truck started overheating at different times. I could hear water backing up into the overflow when the engine was turned off. I automatically said ok, it's the head gasket.
I checked the oil and there was no water in it. I've never replaced the PCV valve and I know that doesn't help matters.
To remedy the overheating problem, I changed the thermostat because the truck would over heat then it would go from hot straight to cold. The thermostat was stuck open. So, I changed the thermostat and the truck seemed to run fine for a few hours. Next, the overheating started again. So, I drained all of the antifreeze and refiled as instructed. Next, my serpentine belt started squealing really bad. It had 0 moisture on it. I noticed a slight wobble with the top idler pulley and I started thinking maybe it was one of the pulleys or the water pump.
Long story short. When I crank the truck up and let it idle for any amount of time it does not overheat. When I drive down the road it is fine. When I get on the gas, the temp will jump from cold to normal. Next, it will go from normal to almost hot. Here is the magical part **** When the temperature gauge gets almost to the H mark, I can slam on the breaks and the temp will go straight back to normal.... I just dont get it.
I initially thought head gasket, next I thought about the thermostat, radiator cap, antifreeze, flaky water pump.... I am just at a loss... Could it be the fan clutch? I know in the past when I would crank up my truck the fan would be really loud at first and now it just sounds normal.
Yesterday, I put some sea foam in the oil and cranked the truck up. after 30 seconds, I heard a nasty sounding lifter or rocker arm ticking noise. It went from soft to loud. After a few seconds, it would go away. It did this three or four times and now the engine is running like a charm. I assume the overheating will persist after the sea foam was added.
Sorry for the long read. I figured more details would help. If anyone could give some insight, I would greatly appreciate it.
Last edited by XhailGC; 01-17-2011 at 12:36 PM.