I have a 95 Dodge Caravan with the 2.5L TBI engine. This van is really on its last leg, but I’d like to keep it running if possible while I look for a replacement vehicle with the features I want. It currently has about 129,000 miles on it.
The engine has always had a noticeable misfire until warmed up, though it usually runs adequately once warmed up. I have replaced numerous parts over the years that I owned this van, but it did not help.
Now, the problem is that I drove it to work last week, and when I attempted to start it to go home, it just misfired a lot and stalled out. If I kept my foot on the accelerator, and kept the RPMs over 1000 then it would stay running but misfiring a lot, and if I kept the RPMs over 1500 then it seemed to run ok, but the moment I took my foot off the gas, the RPMs would drop to about 250, it would misfire a lot, and stall out.
I tried to start it several times over the week and a half since then, and could not get it to stay running. Yesterday, while I was waiting for my wife to come pick me up at work, I decided to start the van, and keep my foot on the gas to maintain the RPMs high enough for the engine to run properly. Once the temperature gauge was above 25%, I took my foot off the gas, and amazingly it kept running. I drove it around the parking lot a few times, then I drove it home, with my wife following in our other car.
Since it ran ok once warmed up, I am not really sure what I’m looking at. I had suspected a crack in the engine block between a cylinder and water jacket, because the coolant doesn’t pressurize properly, and it randomly overheats but then magically drops down to normal.