Hey guys, my 2006 Dodge Caravan recently overheated and we’re trying to get a clear idea on what could be going on before we completely break this thing down. To begin most of the cooling system failed at once. I had to replace the radiator, cooling fans, thermostat, and it seems like the water pump may have issues as well but we’re trying to figure out our engine troubles before we spend more on the cooling system. The vehicle ran fine for my 20-minute commute at 70 mph on toll roads. As soon as I got on the service road the temperature started rising, and as I was trying to pull off the service road to cut the car off the engine misfired and shut off. The van starts, is hesitant at first sometimes, and is rough at idle and especially in reverse while backing out of a parking spot or something slow. The van FEELS to run fine at higher speeds and takes the normal amount of time to get to temperature, but as soon as it gets to the normal operating temperature it starts to rise significantly and tries to overheat.
Now we initially thought it could possibly have a blown head gasket. But, there are no signs of a blown head gasket other than the rough idling. There is no coolant in the oil, initially there was no white smoke from the exhaust pipe, and no leaking coolant from behind the exhaust manifold. Our second thought is a burned exhaust valve. This seems to match up pretty perfectly with the symptoms: Rough at idle, loss of power(car battery died gradually while trying to take it around the alley today to the back of the house), tail pipe sucks in on the dollar bill test, stalling/hesitating to start, and of course the misfire as the engine code readout pointed to. We did a compression test this evening and here were the results:
Dry test (PSI approximate)
1 - 170
3 - 130
5 - 175
2 - 140
4 - 125
6 - 160
3 - 135
4 - 130
Adding picture of spark plugs as well. The computer is reporting a misfire on cylinder 2 which makes sense looking at the spark plug, as well as on 3.
What’s interesting here is that the misfire was on 2 but the compression test would point to 4 having the problem instead from what I’m understanding.
We’re just looking for any thoughts any of you guys have before we get everything taken the rest of the way apart so we can have as much of a heads up as possible with what we may be dealing with.
Thanks in advance!