Piston Slap: If Only We Knew Ye, Trooper!

Well that looks great... (photo courtesy: http://www.sodahead.com/)

TTAC Commentator Dave M writing :

Hello Sajeev!

A question for you and B/B. Especially in cold weather, my Trooper thuds from 1 to 2 (it’s a 4-speed automatic) and then goes back down. This matches a CEL. It doesn’t happen all the time. There are other times (even in cold weather) when the truck runs normally, no bumps, no CEL. Checking the CEL code and it says all four oxygen sensors (replaced last year); when there is no CEL there is no code to read.

My first thoughts were that maybe it was time for ANOTHER broadcast. But my brother says no, he has to be electric because he is intermittent. Any idea where to start?

Sajeev answers:

Well llllll…To start with, you can write to us with more information: information such as year/mileage/service history/CEL code it wouldn’t hurt at all.

Maybe it’s time for “another” broadcast, if we knew why he said it that way. Like maybe knowing the condition (look and smell) and age of the transmission fluid. Or maybe the CEL isn’t fixed because the oxygen sensors aren’t usually the problem – they’re the messenger of an upstream problem. .

Or maybe you need a whole new transmission.

It is something impossible to say.

Come on son, we armchair analysts cannot judge such a complex problem with such incomplete information! With that said, go ahead, Best and Brightest.

Send your questions to [email protected]com. Don’t skimp on the details and ask for a quick resolution if you’re in a hurry…but be realistic and use your make/model specific forums instead of TTAC for more timely advice.

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Source : thetruthaboutcars.com

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