Question about 1999 Dodge Intrepid

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Shuts off 1999 Dodge Intrepid 2.7l automatic. Had a tune up over the summer. spark plugs, distributor cap, ect. Has had reliable oil changes, but uses 10w40 oil, because they said the 10w30 leaked. Has had O2 sensor changed and mechanic said that one side of the catalytic converter was plugged or something. Catalytic converter shows up on diagnostics tests as having problems. That was a few years ago. Has 200500 miles on it. No other problems and love the car other than some white smoke from the tail pipe. Two weeks ago, while driving, the check engine light flashed like three times quickly and I decided to pull over, and it just shut off. It will start as usual, but immediately shuts off. If I wait for about thirty minutes, it's fine to drive again. Been to mechanics twice and they have no idea because it doesnt show up because its working by then. They tried the crankshaft sensor?? but it didnt fix it. Happens between 30-40 minutes after driving on hwy at 65 mph. Has happened everytime (three times) since it started to. Someone suggested that the catalytic converter was plugged and and exaust wasnt escaping and this was puttin pressure back on the engine until we let it sit and get the pressure down. Any suggestions, other than replacing random sensors and hoping? :D

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That may be good advice, and if you've had so many warnings about cat.converter, why hasn't it been done if it's been confirmed? Lots of backpressure, can cause head gaskets etc to start blowing, not to mention decreased performance & gas mileage. Even if you check into an approved aftermarket replacement it can't be too expensive. The other thing I would check, is the fuel pressure, as I suspect a fuel pump problem, or at least a plugged filter. I've had same thing on one of my vehicles would run fine when cool, then about half hour later, or sooner, depending on outside temperature, it would die. Sit 20-30 min, and fire up & go for another 10-15min. I ended up carrying a fuel pressure gauge with me, and sure enough, once the fuel pump got warmed up or hot, the pressure dropped right off. Changed pump and all was well. You may have to drive it for a while, then let it run for a good while in the repair shop parking lot to replicate symptoms. That way they can have fuel pressure gauge hooked up and see reading when it happens, to confirm or eliminate that as the problem.

Posted on Oct 13, 2008

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