I have a 1987 4.2L Wrangler with a weber carb.
About a week ago two weird things started happening. I assume they're related but have no proof of it.
First, whenever I've driven my Jeep for more than a couple minutes it makes a big "whoosh" sound when I turn it off. Imagine a Soda bottle opening but louder and more violent.
Second, if I've been running the Jeep for a good 10-15 minutes when I go to turn it off it will "diesel" 3-4 times before finally cutting out. I.e. keep turning over after I've turned off the ignition.
Lastly, two days ago I noticed a decent amount of anti-freeze on my front bumper after driving the Jeep to work. My overflow cap was open and it hasn't happened since I closed it, but I don't see how coolant could get to to the front bumper from it so I don't know if that was really the cause.
Things I've checked:
Engine Thermostat reads normal. It will go slightly above the center mark, then go back down, then repeat. I assume this is just the thermostat actuating on/off so it appears to be working.
Second: Theres plenty of antifreeze.
Third: I'm going to try running either 91 or 93 octane instead of 87 to see if it helps with the dieseling. Thats more of a band aid than a fix though.
Its recently gone from an average high of 60 to almost 85 where I live if thats relevant.
Thanks for reading