Question about Dodge Intrepid

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Wanting to swap out 2.7 engine in a dodge intrepid for different size, more reliable motor. what engines will work? 3.5, 3.2, 3.3? which is easiest to change over and what is required in the way of new motor mounts, engine computer, etc

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  • Mike Fields Apr 27, 2010

    Just the reply I was hoping for! Yes, it would be a good idea to r/r the used 3.5 engine with a new timing belt and water pump too, would it not? for these seem prone to failure on the 3.5

    so if I buy a used 3.5 I need to make sure I get the engine wiring harness and ecm with it? What is the oldest 3.5 that will work in my '99 intripid?

    one more question, is it true there is a 2.7 w/out a pcv valve system? my 2.7 still drives, just a lot of blow by, need to nurse it until I can purchase 3.5 replacement motor. what brand product would u consider the best to flush out accumulated sludge in my current 2.7? Like I said, just need to nurse it for a little longer to save cash for the replacement motor...:) thanks!


  • Mike Fields Apr 27, 2010

    thanks, this is now more than once u have expertly solved my problems, thanks, please stay on here!!

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  • Dodge Master
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The 3.5 will bolt right in, it is the beat choice by far, the 2.7 is junk. u will need to swap over the wiring harnesses and the ECM, the transmission will work and the motor mounts are the same, of course u will need to replace the belts and hoses and it would be a good idea to replace the water pump and timing belt on the used 3.5 liter.

Posted on Apr 26, 2010

  • yadayada
    yadayada Apr 27, 2010

    all the 3.5 engine will work, but get the newest engine you can money permitting, and yes u must use the wiring and electronics from the used engine, so buy it all. I have a 3.5 in my Dodge and the engine runs like a small V8, 250 HP very good acceleration and never had a problem with it.

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Wanting to swap out 2.7 engine in a dodge intrepid for different size more reliable motor. what engines will work? 3.5 3.2 3.3? which is easiest to change over and what is required in the way of new...


I would not recommend such an engine swap especially with OBD-II controlled vehicles.

Any engine that you do fit into that Intrepid other than the same 2.7 liter engine, will also require you to have the computer for that engine installed into your intrepid in order to run that engine, and if the sensor connectors are different then you will also have to change the wiring harness as well, and the cost of all of that will not justify the end result.

Even if you did manage to change everything out successfully, you would still have to contend with an emission test at some point, even if it was just to sell the vehicle, and if you live in California you can forget about ever passing an emission test with that converted vehicle, unless you are able to get the CARB (California Air Resource Board) to issue you a certification number for your modified Intrepid, and do not hold your breath waiting for that to happen.

Look for a 2005 or later 2.7 liter engine for your intrepid, they had all of the the design flaws worked out of those engines by that time.

I hope that this information will help you and save you some trouble and a lot of spent money.

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