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Water Pump Noises?

7709 Views 8 Replies 5 Participants Last post by  offroaderdodge
Hi, I'm new to this forum. I'm hoping that somebody can help me on this one.

Could a water pump make a knocking noise, but only for a minute during a cold start? I've got a 2007 Base Model PT with 2.4L NA engine with 88,000 miles.

The first time I start the car in the morning, I hear a very light knocking noise (my wife probably wouldn't even notice it). It only lasts for about a minute and then it's gone. It will do it again if I let the car sit for a while, maybe 5 hours or so. The weather around here is 20 - 40 degrees F.

I have changed the oil every 2-1/2 to 3 months (about 3,000 miles) using semi-synthetic 5W-30 oil. I've used Castrol GTX, Valvoline, Penzoil during this period. I only recall hearing this noise over this winter, about 2 - 3 months maybe.

I know the water pump, timing belt, etc. are due around 100,000 miles. I was hoping to get them done next year, since I'll be around 100,000 miles. I also need shocks, structs and possibly tires, but don't really have the money for all of it. Just did thermostat, thermostat housing, upper and lower motor mounts, both control arms, ball joints and sway bar bushings.
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It sounds more like a lifter making the noise. Does the frequency of the knock seem longer than a noisy lifter would be? My PT has made that noise since around 80,000 miles, especially when cold. Now at over 263,000 miles, it still makes that noise when cold, but still seems fine.
 

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IC has the right approach. Take the splash shield off and try to locate the noise. The lifter noise may be difficult to accurately locate the noise, since it may be deceiving. But, like others have suggested, it could be a tensioner, or even connecting rod noise, etc. sounds like it is external to the block, it could be the a tensioner (accessory belt or timing belt), a belt itself, etc. If it sounds internal to the engine, then I would go with a lifter first, then consider something like a connecting rod. At that point, your choice is to just watch it to see if it gets worse, especially in warmer weather, or try to fix it. I would tend to keep an eye on it, but there are others here with plenty of good experience and great experience that may feel otherwise.
 
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