Rattling 93 Pathfinder - Nissan Forum

 
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post #1 of 3 Old Feb 25th, 2010, 11:24 AM Thread Starter
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Rattling 93 Pathfinder

I have a 93 pathfinder that tends to have a bit of a valve train rattle after starting. A neighbor who is a mechanic said to get some rislone to help clear the sludge out of the engine. This helped a little bit, but after about 10 seconds on a cold engine start the rattle comes back until the vehicle has warmed up and been driven around. It has 140k with the timing chain replaced, but the valve cover gaskets have not been replaced and appear to be leaking a little.I am planning on changing the valve cover gaskets at the next oil change in a couple of months. Any other helpful hints or tips would be greatly appreciated.

I really like my pathfinder and want to keep it for a long time. I am absolutely in love with the hardbody style!

Thanks
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post #2 of 3 Old Feb 25th, 2010, 01:52 PM
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I'm going to assume this is the 2.4L engine since you ssid it has a timing chain.

And since this truck only has 140K miles I'm going to rule out piston slap. These trucks last WAY longer than that. It is possible to have piston slap at 140K though, I've seen it on my 1991 GA16DE Sentra.

Did the noise go away after the additive? You can try using a heavier grade oil. On older engines I tend to use 10W40 when the weather starts to warm up and 10W30 for the winter. I find the heavier oil prevents leaks and keeps the car running better. For example, my Subaru EJ22 with 160K miles makes no noises with 10W40, but has a little tick from the roller rockers with 10W30.

Another possibility is noisy injectors. try adding some Gumout Regane fuel injector cleaner. Normally I buy the cheap stuff from Gumout because it works just fine, but when I went in to AutoZone a couple days ago the Regane was on sale. If it is take that, if not just stick to the concentrate stuff. Noisy or tired injectors can make a tick that matches the intensity and frequency of a valve tick, so it's a good idea to check them while you're searching for answers. Take a big screw driver and put it to the injectors when the engine is running, with your ear to the plastic handle to better hear if an injector is making the noise.

Good luck!
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post #3 of 3 Old Feb 25th, 2010, 05:29 PM Thread Starter
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I should have said timing belt, as the engine is a V-6. I will definately try the fuel injector cleaner though. Right now I am running 10W30 and might try 10w40, but I think I am still going to research changing the valve covers.

I have tried Lucas stop-leak engine oil but that seems very temporary.

Thanks for the input!
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