2005 GR Caravan with engine problem

fkncrzy · Jun 13, 2010

I bought a 2005 Grand Caravan with a 3.3l last summer. Previous owner told me about a misfire, said it probably needed a tune up. I started with the simple stuff, plugs, wires, ect... None of witch solved the problem. Being an older vehicle with close to 100k miles on it I figured it could use a little cash thrown at it so I moved on to replacing the coil pack and EGR valve. These also did not work. After a little research I found out about a TSB for plugs, wires, and PCM flash. Took it into local dealership an paid to have the PCM update done. Problem still not solved. Local dealer then diagnosed it down to a bent connecting rod......... never heard that before. Brought it home with nothing but faith in thier expertise.....lol, proceeded to do a compression check. Number 6 was down about 70 PSI, and at top dead center was down a little less than 1/4 inch below the others. I am now assuming the dealer was right.

Is it possible on these to replace a rod from underneath?
If so what is the best way to compress the rings from there?
If anyone has an answer for me any specifics on this job would really be appreciated!!!!

fkncrzy · Jun 13, 2010

And hello!!! I am new here from virginia

andyg · Jun 13, 2010

You can replace the piston/rod assembly in the van, but it has to be done from the top with the head removed. You will remove the heads and all else related to get them off. Then drop the oil pan and unbolt the connecting rod end cap and the piston/rod will come right out the top. Hone the cylinder lightly with a 320 grit ball hone. Install the new (or I would go used) rod/piston with new rings and a new bearing.

You will need a ring compressor and a ball hone as the only specialty tools. You will be able to pick those up for less than $40 total at a NAPA. This repair will take some time, but should not be all that difficult.

Although why did that rod bend in the first place? They don't just bend out of nowhere. I bet the engine may have hydrolocked once upon a time and the previous owner just went about draining the water to get it running but gave up because of the miss.

KOG · Jun 13, 2010

Bent connecting rod is about impossible. Bent pushrod is a maybe.

jgbat · Jun 13, 2010

If that piston is a quarter of an inch lower than the other 5, he has a bent connecting rod. While I agree it is not common, it is far from impossible. I'd say Andy hit the nail on the head.

AzTraveller · Jun 14, 2010

While you're UNDER there, with the pan open. Personally, I would replace ALL the bearings (mains and rods), just for PR. Who knows, he may have run it low on oil and spun a bearing. Still worth checking them all. Also, check the surface of the crank while the bearing is removed. They don't cost that much, anyway .......

2005 GR Caravan with engine problem

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